Zhang Ling, Zhang Rong, Ge Ruixiang, Ren Xiang, Hao Shuai, Xie Fengyu, Qu Fengli, Liu Zhiang, Du Gu, Asiri Abdullah M, Zheng Baozhan, Sun Xuping
College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan, P. R. China.
College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610068, Sichuan, P. R. China.
Chemistry. 2017 Aug 25;23(48):11499-11503. doi: 10.1002/chem.201702745. Epub 2017 Aug 3.
Searching for a simple and fast strategy to effectively enhance the oxygen evolution reaction (OER) performance of non-noble-metal electrocatalysts in alkaline media remains a significant challenge. Herein, the OER activity of NiFe-LDH nanoarray on carbon cloth (NiFe-LDH/CC) in alkaline media is shown to be greatly boosted by an amorphous NiFe-Borate (NiFe-B ) layer formation on NiFe-layered double hydroxide (NiFe-LDH) surface. Such a NiFe-LDH@NiFe-B /CC catalyst electrode only needs an overpotential of 294 mV to drive 50 mA cm in 1.0 m KOH; 116 mV less than that needed by NiFe-LDH/CC. Notably, this electrode also demonstrates strong long-term electrochemical durability. The superior activity is ascribed to the pre-formed amorphous NiFe-B layer effectively promoting active species generation on the NiFe-LDH surface. This work opens up exciting new avenues for developing high-performance water-oxidation catalyst materials for application.
寻找一种简单快速的策略来有效提高非贵金属电催化剂在碱性介质中的析氧反应（OER）性能仍然是一项重大挑战。在此，通过在镍铁层状双氢氧化物（NiFe-LDH）表面形成非晶态镍铁硼酸盐（NiFe-B）层，碱性介质中碳布上的NiFe-LDH纳米阵列（NiFe-LDH/CC）的OER活性得到显著提高。这种NiFe-LDH@NiFe-B/CC催化剂电极在1.0 m KOH中驱动50 mA cm只需294 mV的过电位；比NiFe-LDH/CC所需的过电位低116 mV。值得注意的是，该电极还表现出很强的长期电化学耐久性。优异的活性归因于预先形成的非晶态NiFe-B层有效地促进了NiFe-LDH表面活性物种的生成。这项工作为开发高性能水氧化催化剂材料开辟了令人兴奋的新途径。
