- Title
- Single atom tungsten doped ultrathin α-Ni(OH)₂ for enhanced electrocatalytic water oxidation
- Creator
- Yan, Junqing; Kong, Lingqiao; Ji, Yujin; White, Jai; Li, Youyong; Zhang, Jing; An, Pengfei; Liu, Shengzhong; Lee, Shuit-Tong; Ma, Tianyi
- Relation
- Nature Communications Vol. 10, no. 2149
- Publisher Link
- http://dx.doi.org/10.1038/s41467-019-09845-z
- Publisher
- Nature Publishing Group
- Resource Type
- journal article
- Date
- 2019
- Description
- 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.
- Subject
- electrocatalytic water oxidation; W⁶⁺ doped Ni(OH)₂ nanosheet; oxygen evolution reaction; electrical conductivity
- Identifier
- http://hdl.handle.net/1959.13/1402762
- Identifier
- uon:35062
- Identifier
- ISSN:2041-1723
- Rights
- This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
- Language
- eng
- Full Text
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