Affiliation:
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
Abstract
AbstractMo2C is an excellent electrocatalyst for hydrogen evolution reaction (HER). However, Mo2C is a poor electrocatalyst for oxygen evolution reaction (OER). Herein, two different elements, namely Co and Fe, are incorporated in Mo2C that, therefore, has a finely tuned electronic structure, which is not achievable by incorporation of any one of the metals. Consequently, the resulting electrocatalyst Co0.8Fe0.2–Mo2C‐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 long‐term stability in alkaline medium. Theoretical data demonstrates that Co0.8Fe0.2–Mo2C‐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 charge‐transfer resistance.
Funder
National Research Foundation of Korea
Cited by
3 articles.
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