氢氧化物
双功能
腐蚀
析氧
电解质
分解水
材料科学
电催化剂
层状双氢氧化物
无机化学
溶解
碱性电池
化学工程
电极
冶金
化学
催化作用
电化学
工程类
物理化学
光催化
生物化学
作者
Shuo Duan,Zhen Liu,Haihua Zhuo,Tanyuan Wang,Jianyun Liu,Liang Wang,Jiashun Liang,Jiantao Han,Qing Li
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2020-01-01
卷期号:12 (42): 21743-21749
被引量:44
摘要
We report a facile route to fabricate free-standing NiFe hydroxides by corrosion engineering as high-performance bifunctional electrocatalysts for seawater splitting. Compared with H2SO4 and HNO3, HCl can promote the dissolution of Ni2+ from NiFe foam and the in situ formation of active NiFe hydroxides due to the strong interaction between Cl- and metal. In situ Raman spectroscopic characterization reveals that HCl corrosion induced NiFe hydroxides (HCl-c-NiFe) can generate oxygen evolution reaction (OER) active NiOOH species at a low potential of 1.4 V vs. reversible hydrogen electrode (RHE) and exhibits equally respectable activity for the hydrogen evolution reaction (HER). During a 1000 h test in an alkaline electrolyte or a 300 h test in an alkaline seawater electrolyte within a two-electrode system at 100 mA cm-2, the cell exhibits outstanding stability and high Cl- tolerance with a low working voltage of 1.62 V, outperforming benchmark Pt/IrO2 and most of the reported bifunctional catalysts.
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