材料科学
双功能
纳米结构
分解水
催化作用
双功能催化剂
纳米片
化学工程
纳米技术
纳米材料
塔菲尔方程
层状双氢氧化物
电化学
双金属片
电极
X射线光电子能谱
光催化
化学
工程类
氢氧化物
生物化学
作者
Xiaobing Xu,Wei Zhong,Lei Zhang,Guang-Xiang Liu,Wei Xu,Yu Zhang,Youwei Du
标识
DOI:10.1016/j.surfcoat.2020.126065
摘要
Abstract To develop a high efficiency non-precious electrocatalyst with cost-effective and good stability for Hydrogen Evolution Reaction (HER) and Oxygen Evolution Reaction (OER) still remains a formidable challenge. Herein, we present a new hydrothermal method based on integrating NiCo-Layered Double Hydroxides (NiCo-LDHs) with Molybdenum Sulfide (MoS2) to develop a three-dimensional (3D) MoS2/NiCo2S4 nanostructure supported on Nickel Foam (NF). To optimize the interfacial structure and promote the catalytic activity, the molar ratio of MoS2/NiCo2S4 is used to regulate the hybrids' nanostructure. The optimal MoS2/NiCo2S4/NF is obtained as the molar ratio reaches 20%, which can be used as a bifunctional electrocatalyst with ultrahigh electrocatalytic property for HER and OER in alkaline electrolyte. As expected, the optimize MoS2/NiCo2S4/NF shows an overpotential as small as 90 and 220 mV at 10 mA cm−2 for HER and OER in 1 M KOH. Additionally, an electrolyzer is assembled where MoS2/NiCo2S4/NF serves as anode and cathode electrode, the current densities achieve 10 mA cm−2 only need a cell potential of 1.49 V. This works can provide a new window for designing high-efficiency and cost-effective non-precious bifunctional catalysts based on LDHs as precursors for HER and OER in the future.
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