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学者姓名：郭君诚
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Abstract ：
High temperature proton exchange membrane fuel cell is one of the prominent power generators without consuming fossil fuels. Meanwhile, absorption carbon capture system plays an important role in carbon emission reduction. In this paper, by integrating these two systems, we propose a novel hybrid system to achieve improved hydrogen utilization efficiency and negative carbon emission. Considering the electrochemical and thermodynamic irreversible losses involved, as well as the matching between the two subsystems, the power density and efficiency for each subsystem and the overall system are derived analytically. The optimal performance and operation of the hybrid system are analyzed and discussed. Notably, compared to the standalone high temperature proton exchange membrane fuel cell, the maximum power density of the hybrid system increases by 24.0% and reaches 3933 W.m(-2) for the given parameter values, and the corresponding efficiency rises from 20.9% to 23.1%. Additionally, the impacts of key parameters are investigated, which indicates the important role of the absorbent with appropriate mass to heat transfer coefficient ratio in performance enhancement. In the end, the performance comparisons with various hybrid systems based on high temperature proton exchange membrane fuel cell are presented. The outcomes show that the advanced absorbents with higher operating temperature lead to competitive performance of the proposed hybrid system.
Keyword ：
Absorption carbon capture system Absorption carbon capture system Fuel cell Fuel cell High temperature proton exchange membrane High temperature proton exchange membrane Negative carbon emission Negative carbon emission Performance enhancement Performance enhancement Waste heat utilization Waste heat utilization
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| GB/T 7714 | Tan, Chaohuan , Cheng, Linhao , Peng, Wanli et al. Negative carbon emission power generator: A combination of high temperature proton exchange membrane fuel cell and absorption carbon capture system [J]. | JOURNAL OF CLEANER PRODUCTION , 2025 , 489 . |
| MLA | Tan, Chaohuan et al. "Negative carbon emission power generator: A combination of high temperature proton exchange membrane fuel cell and absorption carbon capture system" . | JOURNAL OF CLEANER PRODUCTION 489 (2025) . |
| APA | Tan, Chaohuan , Cheng, Linhao , Peng, Wanli , Yang, Hanxin , Luo, Rongxiang , Guo, Juncheng . Negative carbon emission power generator: A combination of high temperature proton exchange membrane fuel cell and absorption carbon capture system . | JOURNAL OF CLEANER PRODUCTION , 2025 , 489 . |
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Low-grade thermal energy utilization plays an important role in addressing escalating energy demand and environmental challenges. However, primary low-grade thermal energy harvesting technologies are currently only capable of their own single and fixed energy conversion and transport modes, which limits their further application. To break this bottleneck, we innovatively propose an electrochemical energy converter (EEC(s)) cycle model, which consists of three isothermal processes and three open-circuit heating (or cooling) processes and operates between three heat reservoirs. Notably, the proposed EEC(s) integrates and enables flexible switching of thermal-to-electricity and thermal-to-refrigeration harvesting strategies. Moreover, the complementary roles of thermal energy and electricity are enabled to meet different levels of cooling demand. Significantly, its extraordinary thermal-to-refrigeration conversion efficiency and great potential as an alternative to conventional thermally driven refrigerators are emphasized. Specifically, when the EEC(s) operates at maximum cooling power density, a thermal-to-refrigeration conversion performance coefficient of 0.498 and a Carnotrelative efficiency of 32.3% are predicted for the given operating temperatures. Additionally, the different roles of the cell parameters in enhancing the EECs performance are specified. This work demonstrates the feasibility of integrating multiple energy conversion and transport modes into a novel electrochemical cycle configuration and provides a promising solution for efficient and comprehensive low-grade thermal energy utilizations.
Keyword ：
Combined thermal and power driving mode Combined thermal and power driving mode Electrochemical energy converter Electrochemical energy converter Low-grade thermal energy utilization Low-grade thermal energy utilization Thermal-to-electricity conversion Thermal-to-electricity conversion Thermal-to-refrigeration conversion Thermal-to-refrigeration conversion
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| GB/T 7714 | Chen, Bo , Chen, Yangfeng , Yang, Hanxin et al. An electrochemical energy converter integrating multiple energy conversion and transport modes [J]. | ENERGY CONVERSION AND MANAGEMENT , 2025 , 327 . |
| MLA | Chen, Bo et al. "An electrochemical energy converter integrating multiple energy conversion and transport modes" . | ENERGY CONVERSION AND MANAGEMENT 327 (2025) . |
| APA | Chen, Bo , Chen, Yangfeng , Yang, Hanxin , Luo, Rongxiang , Gonzalez-Ayala, Julian , Hernandez, A. Calvo et al. An electrochemical energy converter integrating multiple energy conversion and transport modes . | ENERGY CONVERSION AND MANAGEMENT , 2025 , 327 . |
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An efficient hybrid system integrating a direct carbon fuel cell (DCFC) with a vacuum graphene-anode thermionic converter (VGTC) is proposed for cogeneration. The VGTC efficiently recycles waste heat released from the DCFC and generate additional electricity, significantly improving energy utilization efficiency and economic performance. A comprehensive mathematical model is developed to quantitatively assess the thermodynamic performance of the hybrid system, taking into account the overpotential losses of the DCFC and the irreversible energy losses occurring within the system. The results show that at an operating temperature of 923 K, the hybrid system can achieve a maximum power density of 466 W/m2, which is approximately 1.34 times that of a single DCFC, indicating a significant improvement in output performance. Besides, the optimal operating region and parameter selection criteria for the hybrid system are determined using finite-time thermodynamic optimization theory. Furthermore, the effects of essential parameters on the output performance of the hybrid system, such as the operating temperature of the DCFC, the heat transfer coefficient, the Fermi level of graphene, the work function of the cathode, the thermal emissivity, and the reflectivity of the back mirror, are investigated. Finally, the comparative study shows that the proposed hybrid system outperforms other previously reported hybrid systems regarding output electric power and conversion efficiency due to the efficient high-grade waste heat recovery and energy conversion by the VGTC. © 2024 Elsevier B.V.
Keyword ：
Anodes Anodes Energy conversion efficiency Energy conversion efficiency Energy dissipation Energy dissipation Energy utilization Energy utilization Graphene Graphene Heat transfer Heat transfer Hybrid systems Hybrid systems Molecular biology Molecular biology Temperature Temperature Thermoanalysis Thermoanalysis Waste heat Waste heat Waste heat utilization Waste heat utilization
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| GB/T 7714 | Gao, Fei , XiaHou, Xiuwen , Ding, Ao et al. Thermodynamic performance evaluation and optimization of a hybrid system integrating vacuum graphene-anode thermionic converters with direct carbon fuel cells [J]. | Journal of Power Sources , 2024 , 614 . |
| MLA | Gao, Fei et al. "Thermodynamic performance evaluation and optimization of a hybrid system integrating vacuum graphene-anode thermionic converters with direct carbon fuel cells" . | Journal of Power Sources 614 (2024) . |
| APA | Gao, Fei , XiaHou, Xiuwen , Ding, Ao , Sun, Hongzhe , Zhang, Xin , Guo, Juncheng et al. Thermodynamic performance evaluation and optimization of a hybrid system integrating vacuum graphene-anode thermionic converters with direct carbon fuel cells . | Journal of Power Sources , 2024 , 614 . |
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Absorption carbon capture is currently the most commercialized technology and deemed as the vital solution to balance continued use of fossil fuels and carbon emission reduction. Nevertheless, its high energy cost remains the major concern for wide-scale application. Consequently, it is of great significance to address this issue by analyzing the underlying energy conversion mechanism, answering the pivotal question 'What characteristics lead to a superior absorbent?', and developing more efficient absorbent. In this paper, an irreversible decoupling model of absorption carbon capture system, consisting of a heat engine and a chemical pump, is innovatively established. Accordingly, key performance indicators are analytically derived and the optimal operation strategies of the system are explicitly determined. Notably, the matching of two subsystems leads to a novel insight into the heat and mass transfer interaction of absorbent, according to which the simulated results and the question concerning the best absorbent are thermodynamically interpreted and addressed, respectively. Additionally, the comparisons between the calculated optimal energy conversion efficiencies with experimental and simulated results are presented and discussed. Our findings may indicate the efficient pathway for developing advanced absorbent and provide instructing information for the design and operation of practical carbon capture systems. © 2024
Keyword ：
Absorption Absorption Benchmarking Benchmarking Carbon capture Carbon capture Emission control Emission control Energy conversion efficiency Energy conversion efficiency Fossil fuels Fossil fuels Mass transfer Mass transfer
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| GB/T 7714 | Guo, Juncheng , Tan, Chaohuan , Li, Zhexu et al. New insights into energy conversion mechanism, optimal absorbent selection criteria, and operation strategies of absorption carbon capture systems [J]. | Energy , 2024 , 304 . |
| MLA | Guo, Juncheng et al. "New insights into energy conversion mechanism, optimal absorbent selection criteria, and operation strategies of absorption carbon capture systems" . | Energy 304 (2024) . |
| APA | Guo, Juncheng , Tan, Chaohuan , Li, Zhexu , Chen, Bo , Yang, Hanxin , Luo, Rongxiang et al. New insights into energy conversion mechanism, optimal absorbent selection criteria, and operation strategies of absorption carbon capture systems . | Energy , 2024 , 304 . |
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An efficient hybrid system integrating a direct carbon fuel cell (DCFC) with a vacuum graphene-anode thermionic converter (VGTC) is proposed for cogeneration. The VGTC efficiently recycles waste heat released from the DCFC and generate additional electricity, significantly improving energy utilization efficiency and economic performance. A comprehensive mathematical model is developed to quantitatively assess the thermodynamic performance of the hybrid system, taking into account the overpotential losses of the DCFC and the irreversible energy losses occurring within the system. The results show that at an operating temperature of 923 K, the hybrid system can achieve a maximum power density of 466 W/m 2 , which is approximately 1.34 times that of a single DCFC, indicating a significant improvement in output performance. Besides, the optimal operating region and parameter selection criteria for the hybrid system are determined using finite-time thermodynamic optimization theory. Furthermore, the effects of essential parameters on the output performance of the hybrid system, such as the operating temperature of the DCFC, the heat transfer coefficient, the Fermi level of graphene, the work function of the cathode, the thermal emissivity, and the reflectivity of the back mirror, are investigated. Finally, the comparative study shows that the proposed hybrid system outperforms other previously reported hybrid systems regarding output electric power and conversion efficiency due to the efficient high-grade waste heat recovery and energy conversion by the VGTC.
Keyword ：
DCFC DCFC Optimal design Optimal design Thermodynamic analysis Thermodynamic analysis VGTC VGTC Waste heat recovery Waste heat recovery
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| GB/T 7714 | Gao, Fei , XiaHou, Xiuwen , Ding, Ao et al. Thermodynamic performance evaluation and optimization of a hybrid system integrating vacuum graphene-anode thermionic converters with direct carbon fuel cells [J]. | JOURNAL OF POWER SOURCES , 2024 , 614 . |
| MLA | Gao, Fei et al. "Thermodynamic performance evaluation and optimization of a hybrid system integrating vacuum graphene-anode thermionic converters with direct carbon fuel cells" . | JOURNAL OF POWER SOURCES 614 (2024) . |
| APA | Gao, Fei , XiaHou, Xiuwen , Ding, Ao , Sun, Hongzhe , Zhang, Xin , Guo, Juncheng et al. Thermodynamic performance evaluation and optimization of a hybrid system integrating vacuum graphene-anode thermionic converters with direct carbon fuel cells . | JOURNAL OF POWER SOURCES , 2024 , 614 . |
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During the operation of alkaline fuel cells (AFCs), a significant amount of waste heat is generated, which has negative impacts on energy utilization and the environment. To improve energy efficiency, cost savings, environmental sustainability, and industrial practices, an effective approach is proposed to employ thermogalvanic cells (TGCs) for electric power generation by harvesting low-grade exhaust heat produced in AFCs. A mathematical model of the AFC-TGC hybrid system is established, taking into account the three overpotential losses in AFCs and the irreversible heat losses in TGCs. Based on this thermal -electric coupled model, we investigate the hybrid system's output performance characteristics and optimal parameter design. The calculated results indicate that the hybrid system achieves a considerable increase of 19.72% in maximum power density from 247.07 W m-2 to 295.80 W m-2 and 5.71% in conversion efficiency from 10.16% to 10.74% compared to a single AFC, respectively. In addition, the output performance of the hybrid system can be further improved by adjusting system parameters such as the AFC's operating temperature, the length of each TGC cell, the heat sink temperature, and the thermal convection coefficient. More importantly, a comparative study of the maximum power density of AFC -based cogeneration systems reveals that the TGC demonstrates a remarkable ability to economically recover waste heat from the AFC, surpassing previously reported thermal energy utilization devices. This study provides important theoretical guidance for the optimal design and parametric analysis of AFC-TGC hybrid systems, thereby facilitating the development of high-performance energy cascade utilization systems based on AFC devices.
Keyword ：
Fuel cell Fuel cell Low-grade waste heat Low-grade waste heat Maximum power density Maximum power density Optimal output performance Optimal output performance Thermogalvanic cell Thermogalvanic cell
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| GB/T 7714 | Wang, Mingli , Ruan, Jiafen , Zhang, Jian et al. Modeling, thermodynamic performance analysis, and parameter optimization of a hybrid power generation system coupling thermogalvanic cells with alkaline fuel cells [J]. | ENERGY , 2024 , 292 . |
| MLA | Wang, Mingli et al. "Modeling, thermodynamic performance analysis, and parameter optimization of a hybrid power generation system coupling thermogalvanic cells with alkaline fuel cells" . | ENERGY 292 (2024) . |
| APA | Wang, Mingli , Ruan, Jiafen , Zhang, Jian , Jiang, Yefan , Gao, Fei , Zhang, Xin et al. Modeling, thermodynamic performance analysis, and parameter optimization of a hybrid power generation system coupling thermogalvanic cells with alkaline fuel cells . | ENERGY , 2024 , 292 . |
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Abstract ：
Absorption carbon capture is currently the most commercialized technology and deemed as the vital solution to balance continued use of fossil fuels and carbon emission reduction. Nevertheless, its high energy cost remains the major concern for wide-scale application. Consequently, it is of great significance to address this issue by analyzing the underlying energy conversion mechanism, answering the pivotal question "What characteristics lead to a superior absorbent?", and developing more efficient absorbent. In this paper, an irreversible decoupling model of absorption carbon capture system, consisting of a heat engine and a chemical pump, is innovatively established. Accordingly, key performance indicators are analytically derived and the optimal operation strategies of the system are explicitly determined. Notably, the matching of two subsystems leads to a novel insight into the heat and mass transfer interaction of absorbent, according to which the simulated results and the question concerning the best absorbent are thermodynamically interpreted and addressed, respectively. Additionally, the comparisons between the calculated optimal energy conversion efficiencies with experimental and simulated results are presented and discussed. Our findings may indicate the efficient pathway for developing advanced absorbent and provide instructing information for the design and operation of practical carbon capture systems.
Keyword ：
Absorbent selection criteria Absorbent selection criteria Absorption carbon capture Absorption carbon capture Carbon capture rate Carbon capture rate Energy conversion efficiency Energy conversion efficiency Thermodynamic decoupling model Thermodynamic decoupling model
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| GB/T 7714 | Guo, Juncheng , Tan, Chaohuan , Li, Zhexu et al. New insights into energy conversion mechanism, optimal absorbent selection criteria, and operation strategies of absorption carbon capture systems [J]. | ENERGY , 2024 , 304 . |
| MLA | Guo, Juncheng et al. "New insights into energy conversion mechanism, optimal absorbent selection criteria, and operation strategies of absorption carbon capture systems" . | ENERGY 304 (2024) . |
| APA | Guo, Juncheng , Tan, Chaohuan , Li, Zhexu , Chen, Bo , Yang, Hanxin , Luo, Rongxiang et al. New insights into energy conversion mechanism, optimal absorbent selection criteria, and operation strategies of absorption carbon capture systems . | ENERGY , 2024 , 304 . |
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Built-in method and straightforward adiabatic temperature change method have been widely used in the simulation investigation of Active Magnetic Regeneration Refrigeration (AMRR) cycle. Nevertheless, the difference between the abovementioned two approaches has rarely been dis-cussed. In this regard, a simulation study on the reciprocating packed bed magnetic refrigeration cycle is presented with the special emphasis on the influence of the different magnetocaloric effect evaluated methods, where Gd and water working as magnetic material and heat transfer fluid. With the help of Finite Element Method (FEM), the numerical solutions of the thermody-namic equations of Gd and water can be obtained. Utilizing the FEM, the two methods can lead to same results when the time interval approaches zero. For a comparatively large time interval, the accurate heat expelled to the high-temperature reservoir can be achieved via the straightforward adiabatic temperature change method while the accurate heat absorbing from the low -temperature reservoir can be obtained via the built-in method. Moreover, calculated Coeffi-cient of Performance (COP) via the straightforward adiabatic temperature change method is larger than that via the built-in method.
Keyword ：
Active magnetic regenerator refrigeration cycle Active magnetic regenerator refrigeration cycle Built-in method Built-in method Magnetocaloric effect Magnetocaloric effect method method Straightforward adiabatic temperature change  Straightforward adiabatic temperature change 
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| GB/T 7714 | Xu, Zhichao , Feng, Yefeng , Guo, Juncheng . Simulation investigation of room-temperature reciprocating packed bed magnetic refrigerator cycle: Comparison of magnetocaloric effect evaluated methods [J]. | CASE STUDIES IN THERMAL ENGINEERING , 2023 , 44 . |
| MLA | Xu, Zhichao et al. "Simulation investigation of room-temperature reciprocating packed bed magnetic refrigerator cycle: Comparison of magnetocaloric effect evaluated methods" . | CASE STUDIES IN THERMAL ENGINEERING 44 (2023) . |
| APA | Xu, Zhichao , Feng, Yefeng , Guo, Juncheng . Simulation investigation of room-temperature reciprocating packed bed magnetic refrigerator cycle: Comparison of magnetocaloric effect evaluated methods . | CASE STUDIES IN THERMAL ENGINEERING , 2023 , 44 . |
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The exhaust heat released from SOFCs (solid oxide fuel cells) possesses tremendous energy that can be recovered for energy cascade utilization. Nevertheless, low conversion efficiency or power density limits the SOFC's high-grade waste heat recovery capabilities for the cogeneration of electric power. To address this challenge, a novel hybrid system coupling a SOFC with a GTEC (graphene-collector thermionic energy converter) is proposed, where the GTEC harvests the high-grade exhaust heat produced by the SOFC and generates extra electricity. It is found that the maximum power density of the hybrid system can reach 0.774 W/cm2 at 1073 K, which is 1.20 times higher than that of the sole SOFC, indicating that the hybrid system offers a considerable improvement in output performance. Additionally, the optimal operating conditions and major parameter designs of the hybrid system are determined from the perspective of finite -time thermodynamics. Choosing the optimal area ratio, increasing the SOFC operating temperature, enhancing the heat transfer coefficient, decreasing the thermal emissivity, and fabricating the perfect optical reflector can further improve the optimal performance of the hybrid system. Compared with other SOFC-based hybrid systems, the SOFC-GTEC provides better output performance, proving that the GTEC can more efficiently utilize the exhaust heat produced by SOFC than other energy harvesting devices. This work provides crucial theoretical guidance on the optimal designs and parametric analysis of SOFC-GTEC hybrid systems, thus paving the way towards developing high-performance SOFC cogeneration systems.
Keyword ：
Fuel cell Fuel cell Maximum power density Maximum power density Performance optimization Performance optimization Thermionic energy conversion Thermionic energy conversion Waste heat recovery Waste heat recovery
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| GB/T 7714 | Ding, Ao , Sun, Hongzhe , Zhang, Senyu et al. Thermodynamic analysis and parameter optimization of a hybrid system based on SOFC and graphene-collector thermionic energy converter [J]. | ENERGY CONVERSION AND MANAGEMENT , 2023 , 291 . |
| MLA | Ding, Ao et al. "Thermodynamic analysis and parameter optimization of a hybrid system based on SOFC and graphene-collector thermionic energy converter" . | ENERGY CONVERSION AND MANAGEMENT 291 (2023) . |
| APA | Ding, Ao , Sun, Hongzhe , Zhang, Senyu , Dai, Xiang , Pan, Yue , Zhang, Xin et al. Thermodynamic analysis and parameter optimization of a hybrid system based on SOFC and graphene-collector thermionic energy converter . | ENERGY CONVERSION AND MANAGEMENT , 2023 , 291 . |
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Heat transformers, also referred to as temperature boosters, draw considerable attention for the great potential in exploiting low-grade thermal energy. In this paper, a generic model of three-terminal heat transformer without reference to any specific heat-transfer law is established on the basis of the low-dissipation assumption. Accordingly, the optimum behaviors and parametric choices under two different parameter constraints are investigated and compared. Notably, the connection between overall time constraint and the presence of external heat leak for the three-terminal heat transformer is revealed. In addition, the Omega function based on the trade -off consideration is introduced to provide more practical evaluations. The performances of the three-terminal heat transformer operated at maximum Omega regime are derived and found to be less powerful but more efficient comparing with the associated maximum heating load regime. Moreover, the influences of dissipation symmetry on several key performance indicators are elaborated by using numerical calculation, which leads to the important results of the present paper, namely the performance bounds of coefficient of performance (COP) at maximum heating load and maximum Omega regimes. Finally, the reported COPs from previous researches are collected to illustrate the validity and practical significance of the proposed model and associated perfor-mance bounds.
Keyword ：
Dissipation symmetry Dissipation symmetry Parameter constraints Parameter constraints Performance bounds Performance bounds Three-terminal heat transformer Three-terminal heat transformer Trade-off function Trade-off function
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| GB/T 7714 | Cao, Haibo , Li, Zhexu , Peng, Wanli et al. Optimal analyses and performance bounds of the low-dissipation three-terminal heat transformer: The roles of the parameter constraints and optimization criteria [J]. | ENERGY , 2023 , 277 . |
| MLA | Cao, Haibo et al. "Optimal analyses and performance bounds of the low-dissipation three-terminal heat transformer: The roles of the parameter constraints and optimization criteria" . | ENERGY 277 (2023) . |
| APA | Cao, Haibo , Li, Zhexu , Peng, Wanli , Yang, Hanxin , Guo, Juncheng . Optimal analyses and performance bounds of the low-dissipation three-terminal heat transformer: The roles of the parameter constraints and optimization criteria . | ENERGY , 2023 , 277 . |
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