Anion–Cation Double Substitution in Transition Metal Dichalcogenide to Accelerate Water Dissociation Kinetic for Electrocatalysis. Issue 15 (30th January 2018)

• Record Type: Journal Article
• Authors: Tran, Ngoc Quang; Bui, Viet Q.; Le, Hung M.; Kawazoe, Yoshiyuki; Lee, Hyoyoung
• Is Part Of: Advanced energy materials. Volume 8:Issue 15(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-01-30
• Subjects: codoping -- electrocatalysts -- hydrogen evolution reaction -- synergistic effect -- vanadium‐cobalt phosphosulphide; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201702139
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Until now, many works have shown that the hydrogen evolution reaction (HER) performance can be improved by anion or cation substitution into the crystal lattice of pyrite‐structure materials. However, the synergistic effects of anion–cation double substitution for overall enhancement of the catalytic activity remains questionable. Here, the simultaneous incorporation of vanadium and phosphorus into the CoS2 moiety for preparing 3D mesoporous cubic pyrite‐metal Co1‐ x V x SP is presented. It is demonstrated that the higher catalytic activity of CoS2 after V incorporation can be primarily attributed to abundance active sites, whereas P substitution is responsible for improving HER kinetics and intrinsic catalyst. Interestingly, due to the synergistic effect of P–V double substitution, the 3D Co1‐ x V x SP shows superior electrocatalysis toward the HER with a very small overpotential of 55 mV at 10 mA cm −2, a small Tafel slope of 50 mV dec −1, and a high turnover frequency of 0.45 H2 s −1 at 10 mA cm −2, which is very close to commercial 20% Pt/C. Density functional theory calculation reveals that the superior catalytic activity of the 3D Co1‐ x V x SP is contributed by the reduced kinetic energy barrier of rate‐determining HER step as well as the promotion of the desorption H2 gas process. Abstract : The synergistic effect for super electrocatalyst hydrogen evolution by anion–cation double substitution : For the first time, a new strategy is proposed to satisfy all requirements for the development of a highly active and remarkably durable hydrogen evolution reaction (HER) electrocatalyst. The obtained catalyst exhibits exceptional HER activity, which outperforms the current state‐of‐the‐art catalysts, is one of the most promising candidates for effective nonprecious metal electrocatalysts.