Carbon quantum dots (CQDs) modified α-Fe 2 O 3 /BiVO 4 heterojunction photoanode for enhancing photoelectrochemical water splitting - Details

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Abstract：

The　design　of　photoanode　materials　to　achieve　efficient　water　splitting　is　a　current　research　hotspot　in　photo-　electrochemical　(PEC).　In　this　work,　we　designed　and　prepared　an　alpha-Fe2O3/BiVO4　heterostructure　modified　by　carbon　quantum　dots　((alpha-Fe2O3/BiVO4/CQDs))　as　the　photoanode.　The　modification　of　CQDs　can　broaden　the　sunlight　absorption　ability　and　dramatically　enhance　the　water　oxidation　kinetics　of　alpha-Fe2O3/BiVO4/CQDs.　The　optimized　photoanode　demonstrated　a　photocurrent　density　of　1.32　mA　center　dot　cm-2　at　1.23　V　vs.　RHE,　which　is　2.2　times　than　pristine　alpha-Fe2O3　(0.6　mA　center　dot　cm-2　)　photoanode.　The　IPCE　value　above　29.4　%　at　400　nm,　and　the　onset　potential　is　negatively　shifted　by　243　mV　for　alpha-Fe2O3/BiVO4/CQDs.　The　improved　performance　is　mainly　due　to　the　alpha-Fe2O3/BiVO4　heterojunction　to　achieve　effective　separation　of　photogenerated　carriers　in　the　bulk　phase　and　CQDs　to　improve　light　utilisation　and　OER　kinetics　of　the　photoanode.

Keyword：

BiVO4 Carbon quantum dots Heterojunction PEC

Community：

[ 1 ] [Tian, Ke]Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China
[ 2 ] [Jia, Shiyu]Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing Key Lab Environmentally Harmful Chem Anal, Beijing 100029, Peoples R China
[ 3 ] [Liu, Ziyang]Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing Key Lab Environmentally Harmful Chem Anal, Beijing 100029, Peoples R China
[ 4 ] [Gao, Yuanpan]Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing Key Lab Environmentally Harmful Chem Anal, Beijing 100029, Peoples R China
[ 5 ] [Zhang, Ruoran]Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing Key Lab Environmentally Harmful Chem Anal, Beijing 100029, Peoples R China
[ 6 ] [Tian, Ke]Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing Key Lab Environmentally Harmful Chem Anal, Beijing 100029, Peoples R China
[ 7 ] [Bai, Shouli]Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing Key Lab Environmentally Harmful Chem Anal, Beijing 100029, Peoples R China
[ 8 ] [Zhu, Rui]Nanjing Tech Univ, Sch Chem & Mol Engn, Nanjing 211816, Peoples R China
[ 9 ] [Gao, Shanshan]Xiamen Univ, Xiamen 361000, Peoples R China
[ 10 ] [Geng, Xuanran]Xiamen Univ, Xiamen 361000, Peoples R China
[ 11 ] [Guan, Peipei]Fuzhou Univ, Fuzhou 350108, Peoples R China

Reprint 's Address：

[Tian, Ke]Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China;;[Tian, Ke]Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing Key Lab Environmentally Harmful Chem Anal, Beijing 100029, Peoples R China;;[Bai, Shouli]Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing Key Lab Environmentally Harmful Chem Anal, Beijing 100029, Peoples R China

Email：

tianke@ipe.ac.cn |
baisl@mail.buct.edu.cn

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