Symmetrical synergy of hybrid CoS2-WS2 electrocatalysts for hydrogen evolution reaction

Xiaofeng Zhou, Xiulin Yang, Henan Li, Mohamed N. Hedhili, Kuo-Wei Huang, Lain-Jong Li, Wenjing Zhang

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57 Scopus citations

Abstract

A highly active and stable hybrid electrocatalyst 3D hierarchical CoS2 nanosheets incorporated with WS2 (CoS2@WS2) has been developed via a one-step sulfurization method for the first time, where the contents of WS2 can be adjusted easily. We first prove the addition of small amounts of WS2 enhances the hydrogen evolution reaction (HER) performance of CoS2, and vise versa. In other words, we validated the symmetric synergy for HER between the Co- and W-based sulfide hybrid catalysts. In addition, we confirmed that the formation of nanointerfaces of Co-S-W between CoS2 and WS2 was responsible for the excellent HER activity (an overpotential of -97.2 mV at -10 mA/cm2, a small Tafel slope of 66.0 mV/dec, and prominent electrochemical stability) of hybrid electrocatalyst CoS2@WS2.
Original languageEnglish (US)
Pages (from-to)15552-15558
Number of pages7
JournalJ. Mater. Chem. A
Volume5
Issue number30
DOIs
StatePublished - 2017

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