Needle grass array of nanostructured nickel cobalt sulfide electrode for clean energy generation
Needle grass array of nanostructured nickel cobalt sulfide electrode for clean energy generation
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DOI：
10.1016/j.surfcoat.2018.09.045
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发表时间：
2018-11
影响因子：
5.4
通讯作者：
C. Zequine;S. Bhoyate;K. Siam;P. Kahol;Nikolaos Kostoglou;C. Mitterer;S. Hinder;M. Baker;G. Constantinides;C. Rebholz;Gautam Gupta;Xianglin Li;R. Gupta
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文献类型：
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作者：
C. Zequine;S. Bhoyate;K. Siam;P. Kahol;Nikolaos Kostoglou;C. Mitterer;S. Hinder;M. Baker;G. Constantinides;C. Rebholz;Gautam Gupta;Xianglin Li;R. Gupta
大量的努力集中在寻找地球上丰富的元素，以解决日益增长的能源问题，并提供双功能的行为，为氢和氧的析出反应。混合过渡金属具有良好的协同电化学性能，可作为水裂解过程的双催化剂。在这项研究中，针草阵列的纳米结构的镍钴硫化物（NiCo 2S 4）的合成使用水热过程。合成的NiCo 2S 4电极表现出良好的电催化活性，其析氢和析氧反应的过电位分别为148 mV和293 mV。由两个NiCo 2S 4电极组成的电解槽电池表现出优异的性能，具有高电化学稳定性和1.61 V的低总电池电势，以实现10 mA/cm 2的电流密度。我们的研究表明，混合过渡金属硫族化合物，如NiCo 2S 4，可以作为一个有效的和稳定的电催化剂用于整个水裂解过程。
Significant efforts have been focused on the search of earth-abundant elements to solve growing energy issues and to provide bifunctional behavior for both hydrogen and oxygen evolution reaction. Mixed transition metals could provide promising synergistic electrochemical properties and serve as bi-catalyst for overall water splitting process. In this study, a needle grass array of nanostructured nickel cobalt sulfide (NiCo2S4) was synthesized using a hydrothermal process. The synthesized NiCo2S4electrodes showed promising electrocatalytic activity with a low overpotential of 148 mV and 293 mV for hydrogen and oxygen evolution reactions, respectively. The electrolyzer cell consisting of two NiCo2S4electrodes displayed excellent performance with high electrochemical stability and low overall cell potential of 1.61 V to achieve a current density of 10 mA/cm2. Our study suggests that mixed transition metal chalcogenides such as NiCo2S4could be used as efficient and stable electrocatalyst for overall water splitting process.