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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Carbon cloth supported hierarchical core-shell NiCo2S4@CoNi-LDH nanoarrays as catalysts for efficient oxygen evolution reaction in alkaline solution
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Carbon cloth supported hierarchical core-shell NiCo2S4@CoNi-LDH nanoarrays as catalysts for efficient oxygen evolution reaction in alkaline solution

机译：碳布负载等级核心 - 壳Nico2S4 @ Coni-LDH纳米载体作为碱性溶液中有效氧化反应的催化剂

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摘要

Hierarchical core-shell NiCo2S4@CoNi-LDH nanoarrays grown on carbon cloth (CC) with outstanding electrocatalytic activity for oxygen evolution reaction (OER) were successfully constructed by a three-step hydrothermal strategy. The as-prepared hierarchical core-shell NiCo2S4@CoNi-LDH nanoarrays were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), energy dispersive spectrometry (EDS) and EDS mapping technologies. Electrochemical measurements showed that the OER catalytic activity of as-obtained NiCo2S4@CoNi-LDH catalyst could be tuned by the molar ratio of Co/Ni in CoNi-LDH. Experiments uncovered that NiCo2S4@Co1Ni4-LDH catalyst prepared at the Co/Ni molar ratio of 1:4 exhibited the strongest OER electrocatalytic activity. To deliver the current densities of 100 mA cm(-2), the as-obtained NiCo2S4@Co1Ni4-LDH catalyst required the overpotential of 337 mV in 1.0 M KOH solution. After continuously catalyzing for 40 h, the voltage curve hardly waved, presenting excellent long-term stability. The present work is a useful attempt for constructing highly active and cost-effective OER catalyst. (c) 2020 Elsevier B.V. All rights reserved.
机译：通过三步水热策略成功构建在碳布（CC）上生长在碳布（CC）上生长的碳布（CC）上生长的等级核心 - 壳Nico2S4 @ Coni-LDH纳米载体。通过粉末X射线衍射（XRD），场发射扫描电子显微镜（FeSEM），X射线光电子能谱（XPS），能量分散光谱（EDS），X射线光电子谱（XPS），X射线光电子光谱（EDS）。和EDS映射技术。电化学测量表明，可获得的NicO2S4 @ Coni-LDH催化剂的OER催化活性可以通过CONI-LDH中的CO / Ni的摩尔比进行调整。实验发现，在Co / Ni摩尔比下制备的NicO2S4 @ CO1NI4-LDH催化剂具有1：4的最强的伊尔电催化活性。为了提供100 mA cm（-2）的电流密度，所以获得的NicO2S4 @ CO1NI4-LDH催化剂需要337mV在1.0M KOH溶液中的过电位。在连续催化40小时后，电压曲线几乎没有挥手，呈现出优异的长期稳定性。目前的工作是构建高度活动和经济高效的OER催化剂的有用尝试。 （c）2020 Elsevier B.v.保留所有权利。

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