Zhu Yu-Xun, Jiang Mei-Yan, Liu Min, Wu Lian-Kui, Hou Guang-Ya, Tang Yi-Ping
College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China.
Nanoscale. 2020 Feb 14;12(6):3803-3811. doi: 10.1039/c9nr08749d. Epub 2020 Jan 29.
The development of a nonprecious and Earth-abundant electrocatalyst with high electrocatalytic activity for the oxygen evolution reaction (OER) is an emerging hot issue and remains a grand challenge. In the present work, we proposed a facile strategy to construct ultrathin NiO nanosheets decorated with Fe-V nanoparticles on nickel foam (Fe-V@NiO/NF) for use as an OER electrocatalyst. Due to the 3D rational configuration, the Fe-V@NiO/NF with a heterostructure shows excellent electrocatalytic activity towards the OER. Interestingly, it is found that in situ oxidation by galvanostatic electrolysis in alkaline solution is beneficial to enhance the OER performance. After 10 h of electrolysis, a current density of 50 mA cm is achieved at a low overpotential of 271.1 mV. This is because during the in situ oxidation process, iron and vanadium ions insert into the NiO lattice and lead to the generation of highly active α-FeOOH and an amorphous (oxy)-hydroxide layer. Additionally, the charge transfer resistance dramatically reduces with the prolonging of oxidation time.
开发一种对析氧反应（OER）具有高电催化活性的非贵金属且地球储量丰富的电催化剂是一个新兴的热点问题，并且仍然是一个巨大的挑战。在本工作中，我们提出了一种简便的策略，用于构建在泡沫镍上装饰有Fe-V纳米颗粒的超薄NiO纳米片（Fe-V@NiO/NF），用作OER电催化剂。由于具有三维合理结构，具有异质结构的Fe-V@NiO/NF对OER表现出优异的电催化活性。有趣的是，发现在碱性溶液中通过恒电流电解进行原位氧化有利于提高OER性能。电解10小时后，在271.1 mV的低过电位下实现了50 mA cm的电流密度。这是因为在原位氧化过程中，铁和钒离子插入到NiO晶格中，导致生成高活性的α-FeOOH和无定形（氧）氢氧化物层。此外，随着氧化时间的延长，电荷转移电阻显著降低。
