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

Junqing Yan, Lingqiao Kong, Yujin Ji, Jai White, Youyong Li (), Jing Zhang, Pengfei An, Shengzhong Liu (), Shuit-Tong Lee and Tianyi Ma ()
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Junqing Yan: Shaanxi Normal University
Lingqiao Kong: Shaanxi Normal University
Yujin Ji: Soochow University
Jai White: University of Newcastle
Youyong Li: Soochow University
Jing Zhang: Chinese Academy of Sciences
Pengfei An: Chinese Academy of Sciences
Shengzhong Liu: Shaanxi Normal University
Shuit-Tong Lee: Soochow University
Tianyi Ma: University of Newcastle

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-09845-z

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