Atomic cobalt on nitrogen-doped graphene for hydrogen generation.
Atomic cobalt on nitrogen-doped graphene for hydrogen generation.
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氮掺杂石墨烯上的原子钴用于制氢
DOI：
10.1038/ncomms9668
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发表时间：
2015-10-21
影响因子：
16.6
通讯作者：
Tour JM
中科院分区：
文献类型：
--
作者：
Fei H;Dong J;Arellano-Jiménez MJ;Ye G;Dong Kim N;Samuel EL;Peng Z;Zhu Z;Qin F;Bao J;Yacaman MJ;Ajayan PM;Chen D;Tour JM
通过电催化将水还原为氢气对于清洁能源具有巨大的前景，但其大规模应用依赖于廉价高效催化剂的开发，以取代昂贵的铂催化剂。在这里，我们报告了一种用于制氢的电催化剂，该催化剂基于以单个原子形式分散在氮掺杂石墨烯上的极少量钴。该催化剂在水性介质中具有很强的稳定性和高活性，过电位非常低（30 mV）。各种分析技术和电化学测量表明，催化活性位点与氮配位的金属中心有关。这种不寻常的负载金属原子结构暗示了一种制备极其有效的单原子催化剂的新方法。 人们对开发用于析氢的非贵金属催化剂一直很感兴趣。在这里，作者制造了一种钴催化剂，其中钴作为单个原子分散在氮掺杂的石墨烯上，并报告了其在酸性介质中还原水的高活性和稳定性。
Reduction of water to hydrogen through electrocatalysis holds great promise for clean energy, but its large-scale application relies on the development of inexpensive and efficient catalysts to replace precious platinum catalysts. Here we report an electrocatalyst for hydrogen generation based on very small amounts of cobalt dispersed as individual atoms on nitrogen-doped graphene. This catalyst is robust and highly active in aqueous media with very low overpotentials (30 mV). A variety of analytical techniques and electrochemical measurements suggest that the catalytically active sites are associated with the metal centres coordinated to nitrogen. This unusual atomic constitution of supported metals is suggestive of a new approach to preparing extremely efficient single-atom catalysts. There is ongoing interest in the development of non-precious metal catalysts for hydrogen evolution. Here, the authors fabricate a cobalt catalyst in which the cobalt is dispersed as single atoms on nitrogen-doped graphene, and report its high activity and stability for water reduction in acidic media.