Interface Engineering of MoS2 for Electrocatalytic Performance Optimization for Hydrogen Generation via Urea Electrolysis

Zexing Wu, Xuyun Guo, Zhanhao Zhang, Min Song, Tiantian Jiao, Ye Zhu, Jie Wang, Xien Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

28 Citations (Scopus)

Abstract

Developing highly efficient and low-cost nonprecious electrocatalysts for hydrogen evolution reaction (HER) has a pivotal impact on the emergence of hydrogen energy. Herein, quaternary electrocatalyst characterized by abundant interfaces supported on carbon cloth (denoted as Mo-Co-S-Se/CC) is designed through a facile solvothermal and post-low-temperature selenylation process, which delivers excellent catalytic performances in HER, oxygen evolution reaction (OER), and urea oxidation reaction (UOR) in alkaline electrolyte. Benefiting from the rich interfaces, the designed catalyst delivers current densities of 10 and 100 mA cm-2 with low overpotentials of 58 and 167 mV, respectively, and small Tafel slope of 84 mV dec-1 for HER. For the anodic OER, only 350 mV overpotential is needed to drive 100 mA cm-2 in 1 M KOH solution. Moreover, Mo-Co-S-Se/CC also presents remarkable catalytic activity for UOR in 1 M KOH solution, which provides another way to substitute the sluggish OER to reduce the cost of hydrogen production. As a proof of concept, overall water-splitting tests are measured with Mo-Co-S-Se/CC as both anode and cathode, respectively, in 1 M KOH solution with 0.5 M urea; only 1.4 V is required to drive 10 mA cm-2, much lower than that for urea-free electrolyte with 1.62 V.

Original languageEnglish
Pages (from-to)16577-16584
Number of pages8
JournalACS Sustainable Chemistry and Engineering
Volume7
Issue number19
DOIs
Publication statusPublished - 7 Oct 2019

Keywords

  • hydrogen production
  • interface
  • MoS
  • urea oxidation

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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