Zhang Ying, Shao Qi, Pi Yecan, Guo Jun, Huang Xiaoqing
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu, 215123, China.
Testing & Analysis Center, Soochow University, Jiangsu, 215123, China.
Small. 2017 Jul;13(27). doi: 10.1002/smll.201700355. Epub 2017 May 23.
The design of cost-efficient earth-abundant catalysts with superior performance for the electrochemical water splitting is highly desirable. Herein, a general strategy for fabricating superior bifunctional water splitting electrodes is reported, where cost-efficient earth-abundant ultrathin Ni-based nanosheets arrays are directly grown on nickel foam (NF). The newly created Ni-based nanosheets@NF exhibit unique features of ultrathin building block, 3D hierarchical structure, and alloy effect with the optimized Ni Fe layered double hydroxide@NF (Ni Fe LDH@NF) exhibiting low overpotentials of 210 and 133 mV toward both oxygen evolution reaction and hydrogen evolution reaction at 10 mA cm in alkaline condition, respectively. More significantly, when applying as the bifunctional overall water splitting electrocatalyst, the Ni Fe LDH@NF shows an appealing potential of 1.59 V at 10 mA cm and also superior durability at the very high current density of 50 mA cm .
设计出具有成本效益且性能卓越的用于电化学水分解的地球丰富型催化剂是非常有必要的。在此，报道了一种制备优异双功能水分解电极的通用策略，其中具有成本效益的地球丰富型超薄镍基纳米片阵列直接生长在泡沫镍（NF）上。新制备的镍基纳米片@NF展现出超薄结构单元、三维分级结构以及合金效应等独特特性，优化后的镍铁层状双氢氧化物@NF（Ni Fe LDH@NF）在碱性条件下，对于析氧反应和析氢反应在10 mA cm²时分别表现出210 mV和133 mV的低过电位。更显著的是，当用作双功能全水分解电催化剂时，Ni Fe LDH@NF在10 mA cm²时显示出1.59 V的诱人电位，并且在50 mA cm²的非常高电流密度下也具有优异的耐久性。
