Turning Ni-based hydroxide into an efficient hydrogen evolution electrocatalyst by fluoride incorporation
Turning Ni-based hydroxide into an efficient hydrogen evolution electrocatalyst by fluoride incorporation
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DOI：
10.1016/j.elecom.2017.12.001
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发表时间：
2018
影响因子：
5.4
通讯作者：
Bowei Zhang;Shan Hu
中科院分区：
文献类型：
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作者：
Bowei Zhang;Shan Hu
镍基氧化物/氢氧化物在析氧反应中的使用已被广泛报道，氟化物前体也经常用于其合成。然而，由于镍基氧化物/氢氧化物通常被认为对析氢反应（HER）无活性，因此还没有研究过氟化物对这些材料的HER活性的影响。然而，这些化合物在HER过程中是化学不稳定的，并且可以转化为相应的氧化物/氢氧化物。在1 M KOH溶液中，由于氟化物的引入，NiFe氢氧化物的HER过电位在− 10 mA/cm 2处发生了约91 mV的漂移，这是由于氟化物引发的电荷转移能力增强所致。这一发现提供了一种新的方法，将其催化活性受到低固有电导率阻碍的通常非活性材料转化为电催化剂，并将导致新催化剂的发现。
The use of Ni-based oxides/hydroxides in the oxygen evolution reaction has been extensively reported and fluoride precursors have frequently been used in their synthesis. However, there have been no studies of the effect of fluoride in Ni-based oxides/hydroxides on the hydrogen evolution reaction (HER) as these materials are generally considered inactive for HER. Recently the HER activities of Ni-based oxides/hydroxides have been improved by doping with anions (single bondP, single bondS, and single bondSe). However, these compounds are chemically unstable during HER and can be converted into the corresponding oxides/hydroxides. In this paper we discovered an interesting phenomenon: the NiFe hydroxide can be turned into an active HER material by incorporating fluoride into it. In 1 M KOH, a significant shift of ~ 91 mV was observed in the HER overpotential at − 10 mA/cm2due to the enhanced charge transfer ability triggered by fluoride. This discovery provides a new approach to turning normally inactive materials, whose catalytic activity is hindered by low intrinsic conductivity, into electrocatalysts, and will lead to the discovery of new catalysts.