Catalytic activity of graphene-covered non-noble metals governed by proton penetration in electrochemical hydrogen evolution reaction.
Catalytic activity of graphene-covered non-noble metals governed by proton penetration in electrochemical hydrogen evolution reaction.
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DOI：
10.1038/s41467-020-20503-7
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发表时间：
2021-01-08
影响因子：
16.6
通讯作者：
Ito Y
中科院分区：
文献类型：
--
作者：
Hu K;Ohto T;Nagata Y;Wakisaka M;Aoki Y;Fujita JI;Ito Y
石墨烯包覆是实现酸稳定、非贵金属催化的析氢反应（HER）的一种很有前途的方法。优化石墨烯覆盖层的数量和化学掺杂产生的缺陷密度对于实现耐腐蚀性和催化活性之间的平衡至关重要。在这里，我们调查的电荷转移和质子渗透通过石墨烯层的HER机制的非贵金属镍和铜在酸性电解质的影响。我们发现，增加石墨烯覆盖层的数量显著改变了Ni和Cu的HER性能。通过电化学实验和模拟探索的质子渗透揭示了石墨烯覆盖的催化剂的HER活性由质子渗透的程度决定，如由石墨烯覆盖层的数量确定的。石墨烯包覆技术为制备在酸性介质中具有抗腐蚀性和催化活性的非贵金属催化剂提供了一条很有前途的途径。在这里，作者揭示了电化学析氢机制是由质子渗透现象。
Graphene-covering is a promising approach for achieving an acid-stable, non-noble-metal-catalysed hydrogen evolution reaction (HER). Optimization of the number of graphene-covering layers and the density of defects generated by chemical doping is crucial for achieving a balance between corrosion resistance and catalytic activity. Here, we investigate the influence of charge transfer and proton penetration through the graphene layers on the HER mechanisms of the non-noble metals Ni and Cu in an acidic electrolyte. We find that increasing the number of graphene-covering layers significantly alters the HER performances of Ni and Cu. The proton penetration explored through electrochemical experiments and simulations reveals that the HER activity of the graphene-covered catalysts is governed by the degree of proton penetration, as determined by the number of graphene-covering layers. Graphene-covering technology provides a promising approach for achieving a non-noble-metal-catalyst with corrosion protection and catalytic activity under acidic media. Here, the authors unveil that the electrochemical hydrogen evolution mechanism is governed by the proton penetration phenomenon.
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