Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 6, Pages 6161-6169Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b06360
Keywords
CoMo carbonate hydroxides; Amorphous; Energy level; Oxygen evolution reaction
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Funding
- Natural Science Foundation of China (NNSFC) [21673105, 21571089]
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The oxygen evolution reaction (OER) accompanied by multistep proton-coupled electron transfer is the decisive step of electrochemical water splitting due to the sluggish kinetics process. Enhancing the efficiency of water splitting indispensably requires stable and high-efficiency electrocatalysts for OER. The OER activity of electrocatalysts can be largely heightened by well adjusting their energy level and active sites. Herein, the amorphous iron cobalt molybdenum carbonate hydroxide core-shell microspheres (FeCoMo/CoMo) offer significant opportunities to improve the OER activity in both thermodynamics and kinetics due to the appropriate matching of the energy level with the equilibrium potential of OER and the abundant active sites.The well-designed Fe-0.25-CoMoCH/NF sample exhibits prominent activity toward OER with an overpotential as low as 232 mV to deliver a current density of 10 mA cm(-2), a small Tafel slope of 46 mV dec(-1), and excellent stability in alkaline solution. Mechanistic studies using a rotating ringdisk electrode confirm the four-electron pathway with high faradaic efficiency (97.7%) toward OER. This research provides a model system so as to tune the inherent catalytic activity of electrocatalysts.
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