One-step synthesis of mesoporous Cobalt sulfides (CoSx) on the metal substrate as an efficient bifunctional electrode for overall water splitting

Haidong Bian, Tongyuan Chen, Zhixuan Chen, Jiahua Liu, Zebiao Li, Peng Du, Binbin Zhou, Xierong Zeng, Jiaoning Tang, Chen Liu*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

36 Citations (Scopus)

Abstract

Electrocatalysts based on transition metal sulfides (TMSs) are drawing accelerating concerns in renewable energy research because of their intrinsically excellent activities towards both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). To date, considerable efforts are made to improve the performance of these catalysts, but ignoring the improper synthesis strategy would incur additional cost to the catalyst. Herein, a convenient, one-step anodization method is developed for fast construction of cobalt sulfides (CoSx). Without any high-temperature or long-time treatment, mesoporous CoSx is self-grown on the metal substrate in minutes. As a result, as-anodic CoSx requires overpotentials of 102 mV for HER and 284 mV for OER to achieve a current density of 10 mA m−2 in alkaline solution. Moreover, the tandem bifunctional as-anodic CoSx exhibits a required cell voltage of 1.64 V for overall water splitting in alkaline solution, exceeding most of the documented Co-based electrocatalysts.
Original languageEnglish
Article number138786
JournalElectrochimica Acta
Volume389
Online published17 Jun 2021
DOIs
Publication statusPublished - 1 Sept 2021

Research Keywords

  • Anodization
  • Cobalt sulfides
  • Electrocatalysts
  • HER
  • OER
  • Overall water splitting

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