The development of highly selective, low cost, and energy-efficient electrocatalysts is crucial for CO₂ electrocatalysis to mitigate energy shortages and to lower the global carbon footprint. Herein, we first report that carbon-coated Ni nanoparticles supported on N-doped carbon enable efficient electroreduction of CO₂ to CO. In contrast to most previously reported Ni metal catalysts that resulted in severe hydrogen evolution during CO₂ conversion, the Ni particle catalyst here presents an unprecedented CO faradaic efficiency of approximately 94% at an overpotential of 0.59 V, even comparable to that of the best single Ni sites. The catalyst also affords a high CO partial current density and a large CO turnover frequency, reaching 22.7 mA cm⁻² and 697 h⁻¹ at −1.1 V (versus the reversible hydrogen electrode), respectively. Experiments combined with density functional theory calculations showed that the carbon layer coated on Ni and N-dopants in carbon material both play important roles in improving catalytic activity for electrochemical CO₂ reduction to CO by stabilizing *COOH without affecting the easy *CO desorption ability of the catalyst.

中文翻译：

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碳载Ni纳米颗粒可有效还原CO ₂ †

高选择性，低成本和高能效的电催化剂的开发对于CO ₂电催化以减轻能源短缺和降低全球碳足迹至关重要。本文中，我们首先报道了负载在N掺杂碳上的碳包覆Ni纳米颗粒能够将CO ₂有效地电还原为CO。与大多数先前报道的Ni金属催化剂不同，该金属催化剂在CO ₂转化过程中导致严重的氢析出，Ni颗粒催化剂在0.59 V的超电势下，此处呈现出前所未有的CO法拉第效率，约为94％，甚至可以与最佳的单个Ni位相媲美。所述催化剂还提供高的CO分流密度和大的CO周转频率，达到22.7mA cm ^-2。和在-1.1 V时为697 h ^-1（相对于可逆氢电极）。实验与密度泛函理论计算相结合表明，碳材料中的Ni和N掺杂物上涂覆的碳层均在稳定化* COOH而不提高易* CO脱附能力的过程中，对提高电化学CO ₂还原为CO的催化活性起着重要作用。催化剂。