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Single atom tungsten doped ultrathin ?-Ni(OH)2 for enhanced electrocatalytic water oxidation.

ABSTRACT: Electrocatalytic water oxidation is a rate-determining step in the water splitting reaction. Here, we report one single atom W6+ doped Ni(OH)2 nanosheet 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 d0 W6+ 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)2 nanosheet. 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)2 with the highest performance.

SUBMITTER: Yan J 

PROVIDER: S-EPMC6517434 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature

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Single atom tungsten doped ultrathin α-Ni(OH)<sub>2</sub> for enhanced electrocatalytic water oxidation.

Yan Junqing J   Kong Lingqiao L   Ji Yujin Y   White Jai J   Li Youyong Y   Zhang Jing J   An Pengfei P   Liu Shengzhong S   Lee Shuit-Tong ST   Ma Tianyi T  

Nature communications 20190514 1

Electrocatalytic water oxidation is a rate-determining step in the water splitting reaction. Here, we report one single atom W<sup>6+</sup> doped Ni(OH)<sub>2</sub> nanosheet sample (w-Ni(OH)<sub>2</sub>) 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<sup>2</sup>. Moreover, at high current density of 80 mA/cm<sup>2</sup>, the overpotential value is 267 mV. The correspondin  ...[more]

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