Mo₂C 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 Co_0.8Fe_0.2–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 Co_0.8Fe_0.2–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.

中文翻译：

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微调N掺杂石墨碳负载Co和Fe掺入Mo2C的电子结构以实现超高电化学水氧化活性

Mo ₂ C是一种优异的析氢反应（HER）电催化剂。然而，Mo ₂ C对于析氧反应(OER)来说是一种较差的电催化剂。本文中，两种不同的元素，即Co和Fe，被并入Mo ₂ C中，因此，Mo 2 C具有精细调节的电子结构，这是通过并入任何一种金属都无法实现的。因此，所得电催化剂Co _0.8 Fe _0.2 –Mo ₂ C-80表现出优异的OER催化性能，这可以通过214.0（和246.5）mV的低过电势获得10（和50）mA cm ^-2的电流密度来证明。 ，超低塔菲尔斜率 38.4 mV dec ^-1，并且在碱性介质中具有长期稳定性。理论数据表明，Co _0.8 Fe _0.2 –Mo ₂ C-80 需要最低的过电势（1.00 V）才能使 OER 和 Co 中心成为活性位点。该电催化剂的超高催化性能归因于高Brunauer-Emmett-Teller比表面积、大电化学活性表面积、小塔菲尔斜率和低电荷转移电阻所带来的优异的固有催化活性。