Symmetrical synergy of hybrid Co9S8-MoSx electrocatalysts for hydrogen evolution reaction

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

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

There exists a strong demand to replace expensive noble metal catalysts with efficient and earth-abundant catalysts for hydrogen evolution reaction (HER). Recently the Co- and Mo-based sulfides such as CoS2, Co9S8, and MoSx have been considered as several promising HER candidates. Here, a highly active and stable hybrid electrocatalyst 3D flower-like hierarchical Co9S8 nanosheets incorporated with MoSx has been developed via a one-step sulfurization method. Since the amounts of Co9S8 and MoSx are easily adjustable, we verify that small amounts of MoSx promotes the HER activity of Co9S8, and vise versa. In other words, we validate that symmetric synergy for HER in the Co- and Mo-based sulfide hybrid catalysts, a long-standing question requiring clear experimental proofs. Meanwhile, the best electrocatalyst Co9S8-30@MoSx/CC in this study exhibits excellent HER performance with an overpotential of −98 mV at −10 mA/cm2, a small Tafel slope of 64.8 mV/dec, and prominent electrochemical stability.
Original languageEnglish (US)
Pages (from-to)470-478
Number of pages9
JournalNano Energy
Volume32
DOIs
StatePublished - Jan 7 2017

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