Nat. Commun.: Single Atom Tungsten Doped Ultrathin α-Ni(OH)2 for Enhanced Electrocatalytic Water Oxidation

time:2019-05-21Hits:178设置

Title:

Single Atom Tungsten Doped Ultrathin α-Ni(OH)2 for Enhanced Electrocatalytic Water Oxidation

Authors

Junqing Yan1,#,*, Lingqiao Kong1,#, Yujin Ji2,#, Jai White3,#, Youyong Li2,*, Jing Zhang4, Pengfei An4, Shengzhong Liu1,5, Shuit-Tong Lee2 & Tianyi Ma 3,*

Institutions

1Key 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.

2Institute 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.

3Discipline of Chemistry, School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia.

4Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People’s Republic of China.

5iChEM, Dalian Institute of Chemical Physics, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China.

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.

IF

12.353

Link

https://www.nature.com/articles/s41467-019-09845-z


Editor:Wenchang Zhu


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