Single atom tungsten doped ultrathin alpha-Ni(OH)(2) for enhanced electrocatalytic water oxidation
Single atom tungsten doped ultrathin alpha-Ni(OH)(2) for enhanced electrocatalytic water oxidation
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单原子钨掺杂超薄 α-Ni(OH)(2) 用于增强电催化水氧化
DOI：
10.1038/s41467-019-09845-z
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发表时间：
2019
影响因子：
16.6
通讯作者：
Ma Tianyi
中科院分区：
文献类型：
--
作者：
Yan Junqing;Kong Lingqiao;Ji Yujin;White Jai;Li Youyong;Zhang Jing;An Pengfei;Liu Shengzhong;Lee Shuit Tong;Ma Tianyi
电催化水氧化是水裂解反应中的一个速率决定步骤。在这里，我们报道了一个单原子W6+掺杂Ni(OH)2纳米片样品（w-Ni(OH)2）具有出色的析氧反应（OER）性能，即在1 M KOH介质中，获得了237 mV的过电位，电流密度为10 mA/cm2。在高电流密度为80 mA/cm2时，过电位值为267 mV。相应的Tafel斜率测量为33mv /dec。低自旋态的d0W6+原子具有更多的最外层空轨道，导致更多的水和OH -基团被吸附在Ni(OH)2纳米片暴露的W位上。密度泛函理论（DFT）计算证实了O自由基和O-O耦合都是在W6+的同一位点产生的。本研究表明，W6+掺杂能以最高的性能促进Ni(OH)2的电催化水氧化活性。
Electrocatalytic water oxidation is a rate-determining step in the water splitting reaction. Here, we report one single atom W6+doped Ni(OH)2nanosheet sample (w-Ni(OH)2) 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/cm2. Moreover, at high current density of 80 mA/cm2, the overpotential value is 267 mV. The corresponding Tafel slope is measured to be 33 mV/dec. The d0W6+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)2nanosheet. Density functional theory (DFT) calculations confirm that the O radical and O-O coupling are both generated at the same site of W6+. This work demonstrates that W6+doping can promote the electrocatalytic water oxidation activity of Ni(OH)2with the highest performance.