Modification of NiCo-S with Phytate for Enhanced Electrocatalytic Hydrogen Evolution Activity
Modification of NiCo-S with Phytate for Enhanced Electrocatalytic Hydrogen Evolution Activity
复制标题
植酸盐修饰 NiCo-S 以增强电催化析氢活性
DOI：
10.1149/1945-7111/ac3594
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发表时间：
2021
影响因子：
3.9
通讯作者：
Wujian Tang
中科院分区：
文献类型：
--
作者：
Yinling Wang;Nannan Ma;Mingli Fan;Wujian Tang
过渡金属磷化物（TMP）是极好的析氢反应（HER）非贵金属电催化剂。由于TMP的不稳定性，在HER过程之前和过程中产生PO 43−是不可避免的。为了研究po43−对电催化剂在碱性介质中HER催化活性的影响，采用六磷酸基植酸酯（PHY）吸附改性NiCo-S纳米管。经zeta电位、FT-IR、元素映射、XPS等实验验证，NiCo-S/PHY的HER活性高于原NiCo-S。在最佳吸附时间（7 h）下，NiCo-S/PHY在10 mA cm−2 （η 10）处的过电位（173 mV）仅为原始NiCo-S （346 mV）的一半。详细讨论了po43−的作用。此外，将该策略扩展到NiCo-S直接生长在泡沫镍（NiCo-S/NF）上，NiCo-S/PHY/NF也表现出优异的HER活性和良好的稳定性。本研究为提高电催化剂的HER活性提供了新的策略，也为研究TMP的HER机理提供了新的视角。
Transition metal phosphides (TMP) are excellent non-precious metal electrocatalysts for hydrogen evolution reaction (HER). The generation of PO 4 3− before and during the HER process may be inevitable due to the instability of TMP. To investigate the effect of PO 4 3− on the HER catalytic activity of electrocatalysts in alkaline medium, NiCo-S nanotubes were modified with phytate (PHY) with six phosphate groups via adsorption. The successful modification was verified by zeta potential, FT-IR, element mapping, XPS, etc The NiCo-S/PHY displayed a higher HER activity than original NiCo-S. Under the optimum adsorption time (7 h), the overpotential at 10 mA cm− 2 (η 10) of NiCo-S/PHY (173 mV) was only half that of the original NiCo-S (346 mV). The role of PO 4 3− was discussed in detail. Moreover, this strategy was extended to NiCo-S grown directly on nickel foam (NiCo-S/NF) and the corresponding NiCo-S/PHY/NF also showed superior HER activity and good stability. This work provides a new strategy to improve the HER activity of electrocatalysts and also a novel perspective for the HER mechanism of TMP.