塔菲尔方程
双金属
纳米片
过电位
碳酸盐
氢氧化物
镍
析氧
材料科学
层状双氢氧化物
无机化学
化学工程
电化学
化学
电极
纳米技术
冶金
工程类
物理化学
作者
Yang Yang,Xuebin Luan,Xiaoping Dai,Xin Zhang,Hongyan Qiao,Huaping Zhao,Jiaxi Yong,Lei Yu,Hanqiao Jiang,Jing Zhang
标识
DOI:10.1016/j.electacta.2019.04.091
摘要
Ultrathin nickel-iron carbonate hydroxides nanosheets/sulfides (denoted as NixFeyS/CH) are fabricated by sulfurizing treatment of nickel-iron carbonate hydroxide (NixFeyCH). The partial sulfuration of NiFe carbonate hydroxides by replacing the CO3/OH groups with the S group can well remain the hexagonal morphology, regulate the electronic structure and expose more electrochemical active sites. Benefiting from the ultrathin-layered sheet with mesoporous structure for more available active sites, the strong coupling between metal carbonate hydroxides/sulfides, as well as bimetal synergism for modulation the composition and electronic structure, the optimal NixFeyS/CH exhibits excellent OER catalytic performance, which reaches 20 mA cm−2 at an ultra-small overpotential of 261 mV, lower Tafel slope (103 mV dec−1) and outstanding stability. This work highlights the importance regarding the modulation of composition and electronic structure by the interface coupling and bimetal synergism for boosting OER performance.
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