Accelerating water oxidation kinetics via synergistic in-layer modification and interlayer reconstruction over hetero-epitaxial Fe-Mn-O nanosheets - Details

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Abstract：

Developing　high-performance　and　low-cost　oxygen　evolution　reaction　(OER)　electrocatalysts　is　critical　for　implementing　industrial　H2　production.　Herein,　ultrathin　Fe-Mn-O　hetero-nanosheets　consisting　of　crystalline　ε-Fe2O3　intercalated　in　amorphous　Fe-doped　δ-MnO2　have　been　fabricated　through　facile　alkali　hydrolysis　of　FeMn-based　coordination　polymer.　Abundant　Mn3+　active　sites　and　oxygen　vacancies　are　generated　in　Fe-doped　δ-MnO2　layer　due　to　in-layer/interlayer　reformations,　where　interstitial　ε-Fe2O3　is　engineered　to　reinforce　stability　and　conductivity.　The　optimal　0.5Fe-Mn-O　nanosheets　exhibit　superb　activity　with　low　overpotentials　of　258　(322)　mV　at　10　(300)　mA　cm−2　for　OER　together　with　strong　stability　under　large　current　density　over　100　h,　ranking　it　among　the　best　MnO2-based　electrocatalysts.　Importantly,　in　situ　interlayer　reconstruction　from　ε-Fe2O3　to　β-FeOOH　during　OER　has　been　unveiled,　the　evolved　β-FeOOH　triggers　strong　interfacial　electronic　coupling,　which　synergizes　with　oxygen　vacancies　and　Fe3+　dopants　to　modulate　surface　electronic　structure　of　δ-MnO2　for　intermediates　adsorption.　©　2022

Keyword：

Coordination polymer; Interfacial coupling; Manganese dioxide; Oxygen evolution reaction; Oxygen vacancy

Community：

[ 1 ] [Cheng, B.]College of Chemistry, Fuzhou University, Fujian, Fuzhou, 350108, China
[ 2 ] [Cheng, B.]State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou, 350002, China
[ 3 ] [Kong, K.]College of Chemistry, Fuzhou University, Fujian, Fuzhou, 350108, China
[ 4 ] [Kong, K.]State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou, 350002, China
[ 5 ] [Zhang, L.]College of Chemistry, Fuzhou University, Fujian, Fuzhou, 350108, China
[ 6 ] [Zhang, L.]State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou, 350002, China
[ 7 ] [Zhang, L.]Fujian Key Laboratory of Functional Marine Sensing Materials, Minjiang University, Fuzhou, 350108, China
[ 8 ] [Sa, R.]Fujian Key Laboratory of Functional Marine Sensing Materials, Minjiang University, Fuzhou, 350108, China
[ 9 ] [Gu, T.]State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou, 350002, China
[ 10 ] [Rui, Y.]State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou, 350002, China
[ 11 ] [Wang, R.]State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou, 350002, China
[ 12 ] [Wang, R.]Tianjin Key Laboratory of Chemical Process Safety, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, China

Reprint 's Address：

[Zhang, L.]State Key Laboratory of Structural Chemistry, Fujian, China

Email：

zhanglinjie@fjirsm.ac.cn

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Source ：

Chemical Engineering Journal

ISSN： 1385-8947

Year： 2022

Volume： 441

1 5 . 1

JCR@2022

1 3 . 4 0 0

JCR@2023

ESI HC Threshold：66

JCR Journal Grade：1

CAS Journal Grade：1

Cited Count：

WoS CC Cited Count：

SCOPUS Cited Count： 19

ESI Highly Cited Papers on the List： 0 Unfold All

WanFang Cited Count：

Chinese Cited Count：

30 Days PV： 2

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