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李有勇教授课题组与陕西师范大学刘生忠教授、闫俊青副教授、纽卡斯尔大学马天翼教授合作在Nature Communications上发表论文
发布时间:2019-05-21 点击:18

题目:

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

作者:

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

单位:

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.

摘要:

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.

影响因子:

12.353

分区情况:

链接:

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


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