单原子钨掺杂超薄α-氢氧化镍用于增强电催化水氧化
Single atom tungsten doped ultrathin α-Ni(OH) for enhanced electrocatalytic water oxidation.
作者信息
Yan Junqing, Kong Lingqiao, Ji Yujin, White Jai, Li Youyong, Zhang Jing, An Pengfei, Liu Shengzhong, Lee Shuit-Tong, Ma Tianyi
机构信息
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education; Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, People's Republic of China.
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, 215123, People's Republic of China.
出版信息
Nat Commun. 2019 May 14;10(1):2149. doi: 10.1038/s41467-019-09845-z.
Electrocatalytic water oxidation is a rate-determining step in the water splitting reaction. Here, we report one single atom W doped Ni(OH) nanosheet sample (w-Ni(OH)) with an outstanding oxygen evolution reaction (OER) performance that is, in a 1 M KOH medium, an overpotential of 237 mV is obtained reaching a current density of 10 mA/cm. Moreover, at high current density of 80 mA/cm, the overpotential value is 267 mV. The corresponding Tafel slope is measured to be 33 mV/dec. The d W atom with a low spin-state has more outermost vacant orbitals, resulting in more water and OH groups being adsorbed on the exposed W sites of the Ni(OH) nanosheet. Density functional theory (DFT) calculations confirm that the O radical and O-O coupling are both generated at the same site of W. This work demonstrates that W doping can promote the electrocatalytic water oxidation activity of Ni(OH) with the highest performance.
电催化水氧化是水分解反应中的速率决定步骤。在此，我们报道了一种单原子W掺杂的Ni(OH)纳米片样品（w-Ni(OH)），其具有出色的析氧反应（OER）性能，即在1 M KOH介质中，过电位为237 mV时可达到10 mA/cm²的电流密度。此外，在80 mA/cm²的高电流密度下，过电位值为267 mV。测得相应的塔菲尔斜率为33 mV/dec。具有低自旋态的W原子具有更多的最外层空轨道，导致更多的水和OH基团吸附在Ni(OH)纳米片暴露的W位点上。密度泛函理论（DFT）计算证实，O自由基和O-O耦合均在W的同一位置产生。这项工作表明，W掺杂可以促进具有最高性能的Ni(OH)的电催化水氧化活性。
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