Nickel phosphide nanoparticles-nitrogen-doped graphene hybrid as an efficient catalyst for enhanced hydrogen evolution activity
Nickel phosphide nanoparticles-nitrogen-doped graphene hybrid as an efficient catalyst for enhanced hydrogen evolution activity
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磷化镍纳米粒子-氮掺杂石墨烯杂化物作为增强析氢活性的有效催化剂
DOI：
10.1016/j.jpowsour.2015.07.077
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发表时间：
2015-11
影响因子：
9.2
通讯作者：
Liu, Chenguang
中科院分区：
文献类型：
--
作者：
Lin, Yan;Li, Yanpeng;Liu, Yunqi;Liu, Chenguang
开发高活性、高稳定性、低成本的复合催化剂是电解水制氢的迫切需要。本文首次采用原位热分解法合成了Ni 2 P纳米粒子（NPs）/N掺杂的还原氧化石墨烯（NRGO）杂化材料，并研究了其作为析氢反应（HER）催化剂的性能。与Ni 2 P/RGO杂化物相比，合成的Ni 2 P/RGO杂化物表现出增强的催化活性，具有低的起始过电位（37 mV）、小的Tafel斜率（59 mV dec−1）、大得多的交换电流密度（4.9 × 10−5A cm−2）和低得多的HER活化能（46.9 kJ mol−1）。此外，Ni 2 P/NRGO杂化物在酸性介质中的催化活性可保持至少60′000 s.这是由于N掺杂的RGO和Ni 2 P纳米粒子的协同效应、Ni和P的带电性质以及Ni 2 P/NRGO杂化物的高导电性。该研究为提高电催化制氢活性提供了新的思路。
Development of hybrid catalysts with high activity, good stability and low cost is extremely desirable for hydrogen production by electrolysis of water. In this work, a hybrid composed of Ni2P nanoparticles (NPs) on N-doped reduced graphene oxide (NRGO) is synthesizedviaanin situthermal decomposition approach for the first time and investigated as a catalyst for the hydrogen evolution reaction (HER). The as-synthesized Ni2P/NRGO hybrid exhibits an enhanced catalytic activity with low onset overpotential (37 mV), a small Tafel slope (59 mV dec−1), a much larger exchange current density (4.9 × 10−5A cm−2), and lower HER activation energy (46.9 kJ mol−1) than Ni2P/RGO hybrid. In addition, the Ni2P/NRGO hybrid maintains its catalytic activity for at least 60′000 s in acidic media. The enhanced catalytic activity is attributed to the synergistic effect of N-doped RGO and Ni2P NPs, the charged natures of Ni and P, as well as the high electrical conductivity of Ni2P/NRGO hybrid. This study may offer a new strategy for improving the electrocatalytic activity for hydrogen production.
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