Synergistic Assembly of a CoS@NiFe/Ni Foam Heterostructure Electrocatalyst for Efficient Water Oxidation Catalysis at Large Current Densities.,Chemistry - An Asian Journal

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Synergistic Assembly of a CoS@NiFe/Ni Foam Heterostructure Electrocatalyst for Efficient Water Oxidation Catalysis at Large Current Densities.
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2020-04-09 , DOI: 10.1002/asia.202000213
Muheng Wang ₁ , Yun Wu ₁ , Na Li ₁ , Fei Zhao ₁ , Qiang Zhao ₁ , Jinping Li ₁ , Guang Liu _{1,

2}

Affiliation

Electrochemical water splitting is an ideal pollution-free path to generate hydrogen at large scale, however, the development of highly catalytic electrocatalysts for the water oxidation reaction at large current densities is still a fundamental challenge. Herein, we report a novel, high-wettability water-oxidation electrocatalyst composed of an amorphous NiFe layer and CoS film on commercial nickel foam via a two-step electrodeposition synthetic path. Benefiting from the strong interactions between the NiFe layer and CoS film, enlarged surface active sites and enhanced wettability, the CoS@NiFe/NF electrode exhibited an outstanding water oxidation performance at 10 mA/cm2 with an overpotential of 175 mV in 1 M KOH solution and steadily delivered a current density of 1 A/cm2 at merely 330 mV in 30 wt% KOH solution. Even at large densities, the CoS@NiFe/NF hybrids also showed excellent water oxidation stability and corrosion resistance for at least 24 h. Such a synergistic assembling approach to fabricate a CoS@NiFe/NF heterostructure together with excellent OER performance may be a promising strategy for rationally building and designing heterostructural electrocatalysts towards highly efficient water oxidation reaction.

中文翻译：

CoS @ NiFe / Ni泡沫异质结构电催化剂的协同组装，可在大电流密度下有效地进行水氧化催化。

电化学水分解是大规模生产氢气的理想无污染途径，但是，开发用于大电流密度水氧化反应的高催化性电催化剂仍然是一项基本挑战。本文中，我们通过两步电沉积合成途径报道了一种新型的，高润湿性的水氧化电催化剂，该催化剂由无定形NiFe层和CoS膜在商用泡沫镍上组成。受益于NiFe层与CoS膜之间的强相互作用，扩大的表面活性位和增强的润湿性，CoS @ NiFe / NF电极在10 mA / cm2的条件下在1 M KOH溶液中具有175 mV的超电势表现出出色的水氧化性能。并且在30 wt％的KOH溶液中仅330 mV稳定地提供了1 A / cm2的电流密度。即使密度很大，CoS @ NiFe / NF杂化物也表现出出色的水氧化稳定性和耐腐蚀性，至少持续24小时。这种协同组装CoS @ NiFe / NF异质结构和优异的OER性能的方法可能是合理构建和设计异质结构电催化剂以实现高效水氧化反应的一种有前途的策略。

更新日期：2020-04-09

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