Fine-tuning electronic structure of N-doped graphitic carbon-supported Co-and Fe-incorporated Mo_(2)C to achieve ultrahigh electrochemical water oxidation activity  

作　　者：Md.Selim Arif Sher Shah Hyeonjung Jung Vinod K.Paidi Kug-Seung Lee Jeong Woo Han Jong Hyeok Park 

机构地区：[1]Department of Chemical and Biomolecular Engineering,Yonsei University,Seoul,Republic of Korea [2]Department of Chemistry,University of North Bengal,Raja Rammohunpur,Darjeeling,West Bengal,India [3]Department of Materials Science and Engineering,Research Institute of Advanced Materials,Seoul National University,Seoul,Republic of Korea [4]Pohang Accelerator Laboratory,Beamline Division,Pohang,Republic of Korea [5]European Synchrotron Radiation Facility,France

出　　处：《Carbon Energy》2024年第7期134-149,共16页碳能源（英文）

基　　金：financial support from the SERB-SURE under file number of SUR/2022/003129;Jong Hyeok Park acknowledges the support of the National Research Foundation of Korea (NRF)funded by the Ministry of Science and ICT (RS-2023-00302697,RS-2023-00268523).

摘　　要：Mo_(2)C is an excellent electrocatalyst for hydrogen evolution reaction(HER).However,Mo_(2)C is a poor electrocatalyst for oxygen evolution reaction(OER).Herein,two different elements,namely Co and Fe,are incorporated in Mo_(2)C that,therefore,has a finely tuned electronic structure,which is not achievable by incorporation of any one of the metals.Consequently,the resulting electrocatalyst Co_(0.8)Fe_(0.2)-Mo_(2)C-80 displayed excellent OER catalytic performance,which is evidenced by a low overpotential of 214.0(and 246.5)mV to attain a current density of 10(and 50)mA cm^(-2),an ultralow Tafel slope of 38.4 mV dec^(-1),and longterm stability in alkaline medium.Theoretical data demonstrates that Co_(0.8)Fe_(0.2)-Mo_(2)C-80 requires the lowest overpotential(1.00 V)for OER and Co centers to be the active sites.The ultrahigh catalytic performance of the electrocatalyst is attributed to the excellent intrinsic catalytic activity due to high Brunauer-Emmett-Teller specific surface area,large electrochemically active surface area,small Tafel slope,and low chargetransfer resistance.

关 键 词：fine-tuning electronic structures heteronanostructures Mo_(2)C multimetal(Co/Fe) oxygen evolution reaction 

分 类 号：O64[理学—物理化学]