NiFe Hydroxide Supported on Hierarchically Porous Nickel Mesh as aHigh-Performance Bifunctional Electrocatalyst for Water Splitting at Large Current Density
NiFe Hydroxide Supported on Hierarchically Porous Nickel Mesh as aHigh-Performance Bifunctional Electrocatalyst for Water Splitting at Large Current Density
复制标题
分级多孔镍网负载的氢氧化镍铁作为大电流密度下水分解的高性能双功能电催化剂
DOI：
10.1002/cssc.201901439
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发表时间：
2019
期刊：
影响因子：
8.4
通讯作者：
Baoguo Wang
中科院分区：
文献类型：
--
作者：
Pei-can Wang;Lei Wan;Yu-qun Lin;Baoguo Wang
制备具有上级稳定性的高效、低成本的水裂解双功能催化剂是当前制氢领域的一个重要课题。采用两步电沉积法，在三维分级Ni网（NiFe/Ni/Ni）上原位生长NiFe层状双氢氧化物，制备了具有分级多孔结构的高活性电极。所制备的NiFe/Ni/Ni电极表现出显著的结构稳定性，具有高的比表面积、有效的气体传输和快速的电子转移。得益于其独特的结构，自支撑NiFe/Ni/Ni电极在10和500 mA.cm-2电流密度下的析氧反应过电位分别为190 mV和300 mV.此外，自支撑NiFe/Ni/Ni电极在析氢反应（HER）中也表现出高性能，并且在500 mA.cm-2的电流密度下对于OER和HER都具有优异的稳定性。值得注意的是，使用NiFe/Ni/Ni作为碱性水电解的阴极和阳极，在1.96 V的电池电压下获得500 mA.cm-2的电流密度。该水电解槽在高温下即使在大电流密度（500mA.cm-2）下也显示出上级稳定性。
The preparation of efficient and low-cost bifunctional catalysts with superior stability for water splitting is a topic of significant current interest for hydrogen generation. A facile strategy has been developed to fabricate highly active electrodes with hierarchical porous structures by using a two-step electrodeposition method, in which NiFe layered double hydroxide is grown .in situ on a three-dimensional hierarchical Ni mesh (NiFe/Ni/Ni). The as-prepared NiFe/Ni/Ni electrodes demonstrate remarkable structural stability with high surface areas, effective gas transportation, and fast electron transfer. Benefiting from the unique structure, the self-supported NiFe/Ni/Ni electrodes exhibit overpotentials of 190 mV and 300 mV for the oxygen evolution reaction (OER) at current densities of 10 and 500 mA.cm-2, respectively. Furthermore, the self-supported NiFe/Ni/Ni electrodes also exhibit high performance in the hydrogen evolution reaction (HER) and excellent stability at a current density of 500 mA.cm-2 for both OER and HER. Remarkably, using NiFe/Ni/Ni as both the cathode and anode for alkaline water electrolysis, a current density of 500 mA.cm-2 is attained at a cell voltage of 1.96 V. Additionally, the water electrolyzer demonstrates superior stability even at a large current density (500 mA.cm-2) when subjected to high temperatures.