Fe/Co and Ni/Co-pentlandite type electrocatalysts for the hydrogen evolution reaction
Fe/Co and Ni/Co-pentlandite type electrocatalysts for the hydrogen evolution reaction
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DOI：
10.1016/s1872-2067(20)63682-8
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发表时间：
2021-08-01
影响因子：
16.5
通讯作者：
Apfel, Ulf-Peter
中科院分区：
文献类型：
--
作者：
Smialkowski, Mathias;Tetzlaff, David;Apfel, Ulf-Peter
富金属过渡金属硫化物作为析氢反应（HER）的电催化剂最近获得了越来越多的关注，因为它们能够克服富硫化物金属催化剂所面临的主要挑战，例如有限的导电性和纳米结构化的必要性。本文中，我们提出了合成，表征和电催化研究的三元富金属硫化物复合材料FexCo 9-xS 8以及NiyCo 9-yS 8（x = y = 0-4.5），具有pentlandite型结构。在这项研究中，我们显示了一个逐步改变的二元钴镍黄铁矿Co 9 S8和报告的替代钴与高达4.5当量的铁或镍。这些蚀变镍黄铁矿复合物在不同温度下促进酸性介质中的质子还原。我们还表明，化学计量的变化有决定性的影响，在还原电催化条件下的催化剂的电化学活化/失活行为。在此，与Co 9 S8相比，缺乏Co的复合材料显示出改善的HER性能。值得注意的是，Ni/Co化合物通常倾向于显示出比它们各自的Fe/Co化合物更高的对HER的催化活性。(C)2021年，中科院大连化学物理研究所。Elsevier B. V.出版，保留所有权利。
Metal-rich transition metal sulfides recently gained increasing attention as electrocatalysts for the hydrogen evolution reaction (HER), as they are capable to overcome major challenges faced by sulfide-rich metal catalysts such as limited conductivity and the necessity of nanostructuring. Herein, we present the synthesis, characterization and electrocatalytic investigation of ternary metal-rich sulfide composites FexCo9-xS8 as well as NiyCo9-yS8 (x = y = 0-4.5), which possess pentlandite-type structures. In this study, we show a stepwise alteration of the binary cobalt pentlandite Co9S8 and report on the replacement of cobalt with up to 4.5 equivalents of either iron or nickel. These altered pentlandite composites facilitate the proton reduction in acidic media at different temperatures. We furthermore show that the stoichiometric variation has a decisive influence on the electrochemical activation/deactivation behavior of the catalysts under reductive electrocatalytic conditions. Here, Co-deficient composites display an improved HER performance in contrast to Co9S8. Notably, Ni/Co compounds generally tend to show higher catalytic activities towards HER than their respective Fe/Co compounds. (C) 2021, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.