Citation: Xiaoli Li, Wenming Xue, Rong Mo, Sui Yang, Hongxing Li, Jianxin Zhong. In situ growth of minimal Ir-incorporated Co_xNi_1-xO nanowire arrays on Ni foam with improved electrocatalytic activity for overall water splitting[J]. Chinese Journal of Catalysis, ;2019, 40(10): 1576-1584. doi: S1872-2067(19)63414-5 shu

In situ growth of minimal Ir-incorporated Co_xNi_1-xO nanowire arrays on Ni foam with improved electrocatalytic activity for overall water splitting

Hunan Key Laboratory for Micro-Nano Energy Materials and Devices, School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, Hunan, China

Received Date: 28 April 2019
Revised Date: 30 May 2019

Fund Project: This work was financially supported by the National Natural Science Foundation of China (51772255), the Hunan Provincial Innovation Foundation For Postgraduate (CX2017B274), the National Basic Research Program of China (2015CB921103), and the Program for Changjiang Scholars and Innovative Research Team in University (IRT13093).

Exploration of cost-effective electrocatalysts for boosting the overall water-splitting efficiency is vitally important for obtaining renewable fuels such as hydrogen. Here, earth-abundant Co_xNi_1-xO nanowire arrays were used as a structural framework to dilute Ir incorporation for fabricating electrocatalysts for water splitting. Minimal Ir-incorporated Co_xNi_1-xO nanowire arrays were synthesized through the facile hydrothermal method with subsequent calcination by using Ni foam (NF) as both the substrate and source of Ni. The electrocatalytic water-splitting performance was found to crucially depend on the Ir content of the parent Co_xNi_1-xO nanowire arrays. As a result, for a minimal Ir content, as low as 0.57 wt%, the obtained Ir-Co_xNi_1-xO/NF electrodes exhibited optimal catalytic activity in terms of a low overpotential of 260 mV for the oxygen evolution reaction and 53 mV for the hydrogen evolution reaction at 10 mA cm^-2 in 1 mol L^-1 KOH. When used as bifunctional electrodes in water splitting, the current density of 10 mA cm^-2 was obtained at a low cell voltage of 1.55 V. Density functional theory calculations revealed that the Ir-doped Co_xNi_1-xO arrays exhibited enhanced electrical conductivity and low Gibbs free energy, which contributed to the improved electrocatalytic activity. The present study presents a new strategy for the development of transition metal oxide electrocatalysts with low levels of Ir incorporation for efficient water splitting.
- Co_xNi_1-xO nanowire array,
- Iridium incorporation,
- Electrocatalyst,
- Water splitting,
- Overpotential
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In situ growth of minimal Ir-incorporated CoxNi1-xO nanowire arrays on Ni foam with improved electrocatalytic activity for overall water splitting

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通讯作者: 陈斌, bchen63@163.com

In situ growth of minimal Ir-incorporated Co_xNi_1-xO nanowire arrays on Ni foam with improved electrocatalytic activity for overall water splitting