Electron-deficient Co 7 Fe 3 induced by interfacial effect of molybdenum carbide boosting oxygen evolution reaction

Developing a high-activity and low-cost catalyst to reduce the anodic overpotential is essential for hydrogen production from water splitting. In this work, a hetero-structured Co Fe /Mo C@C catalyst has been developed to efficiently catalyze oxygen evolution reaction (OER), the overpotential (ƞ ) o...

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Bibliographic Details
Published inJournal of colloid and interface science Vol. 669; p. 95
Main Authors Huang, Weixiong, Ma, Haiyan, Qi, Jiaou, Xu, Junjie, Ding, Yue, Zhu, Shufang, Lu, Lilin
Format Journal Article
LanguageEnglish
Published United States 01.09.2024
Subjects
Electron-deficient CoFe
Interfacial CoFe-MoC effect
Electrochemical oxygen reduction
Molybdenum carbide
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Summary:Developing a high-activity and low-cost catalyst to reduce the anodic overpotential is essential for hydrogen production from water splitting. In this work, a hetero-structured Co Fe /Mo C@C catalyst has been developed to efficiently catalyze oxygen evolution reaction (OER), the overpotential (ƞ ) of Co Fe /Mo C@C-catalyzed OER with current density of 10 mA/cm is about 254 mV, substantially lower than the counterparts of Co Fe @C-catalyzed OER (ƞ , 308 mV) and Mo C@C-catalyzed OER (ƞ , 439 mV), close to that of OER catalyzed by commercial RuO . The mechanistic studies reveal that the distinct electron transfer across the Co Fe /Mo C interface results in electron-deficient Co Fe , which has been identified as the highly active catalytic sites. Density functional theory (DFT) calculations manifest that Mo C induces a distinct decrease in electron density on Co Fe and upgrades the d-band centers of Co and Fe in Co Fe towards Fermi energy level, thus substantially lowering the energy barrier of the rate-determining reaction step and conferring significantly improved OER activity on the Co Fe /Mo C@C catalyst.
ISSN:1095-7103