State Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong 250100, P. R. China.
Nanoscale. 2019 Feb 14;11(7):3268-3274. doi: 10.1039/c8nr09218d.
Electrocatalysts are of significant importance for hydrogen production via water splitting. To replace noble metal based electrocatalysts, exploring new counterparts is critical for their large-scale and widespread deployment. In this paper, we report the synthesis of nickel-cobalt selenite (Ni0.5Co0.5SeO3) networks on nickel foam with promising electrocatalytic performance through a facile electrodeposition method. The networked structure built with interconnected nanosheets along with the three-dimensional backbone of nickel foam is able to provide a large surface area for the reaction to take place and simultaneously offer connected channels for charge carriers to pass through, consequently realizing the enhancement of oxygen evolution reaction (OER) electrocatalytic activity. Importantly, the hierarchical channel structure affords vast spaces to buffer the volume change during repeated redox reactions and offers feasible channels for gas release, leading to good electrochemical stability. The best sample with an optimized composition shows superior catalytic activity with a high current density of 243.6 mA cm-2 at an overpotential of 500 mV and excellent stability.
电催化剂对于通过水分解生产氢气至关重要。为了替代基于贵金属的电催化剂，探索新的替代品对于它们的大规模广泛应用至关重要。本文通过简便的电沉积方法，报告了在泡沫镍上合成具有前景的电催化性能的镍钴硒酸盐（Ni0.5Co0.5SeO3）网络的方法。由相互连接的纳米片以及泡沫镍的三维骨架构建的网络结构，能够为反应提供一个大的表面积，并同时提供载流子的连通通道，从而实现氧析出反应（OER）电催化活性的增强。重要的是，分层通道结构为在反复的氧化还原反应中体积变化提供了广阔的空间，并为气体释放提供了可行的通道，从而实现了良好的电化学稳定性。具有最佳组成的最佳样品表现出优异的催化活性，在 500 mV 的过电势下具有 243.6 mA cm-2 的高电流密度和出色的稳定性。
