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Hydrothermal combined with electrodeposition construction of a stable Co9S8/Ni3S2@NiFe-LDH heterostructure electrocatalyst for overall water splitting
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2021-1-28 , DOI: 10.1039/d0se01805h Fu Liu 1, 2, 3, 4, 5 , Xingzhong Guo 1, 2, 3, 4, 5 , Yang Hou 3, 4, 6, 7, 8 , Fan Wang 1, 2, 3, 4, 5 , Chang Zou 1, 2, 3, 4, 5 , Hui Yang 1, 2, 3, 4, 5
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2021-1-28 , DOI: 10.1039/d0se01805h Fu Liu 1, 2, 3, 4, 5 , Xingzhong Guo 1, 2, 3, 4, 5 , Yang Hou 3, 4, 6, 7, 8 , Fan Wang 1, 2, 3, 4, 5 , Chang Zou 1, 2, 3, 4, 5 , Hui Yang 1, 2, 3, 4, 5
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Electrochemical water splitting provides a prominent route towards clean energy conversion and storage, while unsuitable catalysts restrict its application. Core–shell hierarchical heterostructure materials with strong synergistic effects based on non-noble metal elements have been developed to compensate for inadequacy. In this work, a core–shell hierarchical heterostructure Co9S8/Ni3S2@NiFe-LDH electrocatalyst was prepared via hydrothermal and electrodeposition methods. The resultant Co9S8/Ni3S2@NiFe-120 electrocatalyst consists of Co9S8 substrates as the core and NiFe-LDHs as the shell, and exhibits excellent overall water splitting electrocatalytic activity with a low overpotential of 229 mV for the oxygen evolution reaction (OER), and 151 mV for the hydrogen evolution reaction (HER) and a full cell voltage of 1.62 V at 10 mA cm−2 current density. The core–shell heterostructure constructed by electrodeposition endows the catalyst with outstanding stability and low degradation in long-term catalytic processes as shown by continuous chronopotentiometry tests at current densities of 50, 100 and 200 mA cm−2 for 72 h. The as-prepared core–shell hierarchically heterostructural Co9S8/Ni3S2@NiFe-120 with high-efficiency and good-durability is a promising bifunctional electrocatalyst towards practical applications in overall water splitting.
中文翻译：
水热结合电沉积构建稳定的Co9S8 / Ni3S2 @ NiFe-LDH异质结构电催化剂，用于总水分解
电化学水分解为清洁能源的转化和存储提供了一条重要的途径，而不合适的催化剂会限制其应用。已经开发了基于非贵金属元素具有强协同作用的核-壳分层异质结构材料，以弥补不足。在这项工作中，通过水热和电沉积方法制备了核-壳层级的Co 9 S 8 / Ni 3 S 2 @ NiFe-LDH电催化剂。所得的Co 9 S 8 / Ni 3 S 2 @ NiFe-120电催化剂由Co 9 S 8组成底物为核心，NiFe-LDHs为壳，并表现出优异的整体水分解电催化活性，对于氧释放反应（OER）的低电势为229 mV，对于氢释放反应（HER）的电势为151 mV，且在10 mA cm -2的电流密度下，电池电压为1.62V 。电沉积构造的核-壳异质结构使催化剂在长期催化过程中具有出色的稳定性和低降解性，如连续计时电位测试在50、100和200 mA cm -2的电流密度下持续72 h所示。制备的核-壳分层异质结构Co 9 S 8 / Ni 3 S 2具有高效率和良好耐久性的@ NiFe-120是一种有希望的双功能电催化剂，可用于整体水分解中的实际应用。
更新日期：2021-02-12
中文翻译：
水热结合电沉积构建稳定的Co9S8 / Ni3S2 @ NiFe-LDH异质结构电催化剂，用于总水分解
电化学水分解为清洁能源的转化和存储提供了一条重要的途径，而不合适的催化剂会限制其应用。已经开发了基于非贵金属元素具有强协同作用的核-壳分层异质结构材料，以弥补不足。在这项工作中，通过水热和电沉积方法制备了核-壳层级的Co 9 S 8 / Ni 3 S 2 @ NiFe-LDH电催化剂。所得的Co 9 S 8 / Ni 3 S 2 @ NiFe-120电催化剂由Co 9 S 8组成底物为核心，NiFe-LDHs为壳，并表现出优异的整体水分解电催化活性，对于氧释放反应（OER）的低电势为229 mV，对于氢释放反应（HER）的电势为151 mV，且在10 mA cm -2的电流密度下，电池电压为1.62V 。电沉积构造的核-壳异质结构使催化剂在长期催化过程中具有出色的稳定性和低降解性，如连续计时电位测试在50、100和200 mA cm -2的电流密度下持续72 h所示。制备的核-壳分层异质结构Co 9 S 8 / Ni 3 S 2具有高效率和良好耐久性的@ NiFe-120是一种有希望的双功能电催化剂，可用于整体水分解中的实际应用。
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