题目： | Highly Efficient Hydrogen Evolution from Seawater by a Low-cost and Stable CoMoP@C Electrocatalyst Superior to Pt/C |
作者： | Yuan-Yuan Ma,‡,a Cai-Xia Wu,‡,a Xiao-Jia Feng,a Hua-Qiao Tan,*,a Li-Kai Yan,a Yang Liu,b Zhen-Hui Kang,*,b En-Bo Wanga and Yang-Guang Li*,a |
单位： | aKey Laboratory of Polyoxometalate Science of the Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun, 130024, China bJiangsu Key Laboratory for Carbon-based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China |
摘要： | The hydrogen evolution reaction (HER) based on water electrolysis is a promising strategy for hydrogen energy production, in which the key point is seeking low-cost, high efficiency and stable electrocatalysts. Currently, the most efficient electrocatalysts for the HER are Pt-based catalysts (especially commercial Pt/C), but the low abundance and high cost of Pt hinder their widespread application. Herein, we demonstrate that a cobalt molybdenum phosphide nanocrystal coated by a few-layer N-doped carbon shell (CoMoP@C) is an excellent substitute for the HER. CoMoP@C is prepared by a one-step pyrolysis method on a large scale with polyoxometalate (POM) as a molecular platform. The catalytic activity of CoMoP@C is close to that of commercial 20% Pt/C under pH=0–1 conditions and superior to that of 20% Pt/C under pH = 2–14 conditions at high overpotential (e.g. h> 240 mV at pH=2.2). In real seawater, CoMoP@C exhibits stable HER performance with a high Faradaic efficiency (FE) of 92.5%, while the HER activity of 20% Pt/C dramatically decreases after 4h. The remarkable HER performance of CoMoP@C should be attributed to the low free energy of H on the central CoMoP crystalline core and the multiple functions of the outer N-doped C shell (especially the strong H+ absorption behavior). This work may provide new options for the design and preparation of promising HER electrocatalysts superior to Pt/C, which can be used directly in seawater. |
影响因子： | 25.427 |
分区情况： | 1区 |
链接： | http://pubs.rsc.org/en/content/articlelanding/2017/ee/c6ee03768b#!divAbstract |
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