Self-Assembled Ni 3 S 2 Nanosheets with Mesoporous Structure Tightly Held on Ni Foam as a Highly Efficient and Long-Term Electrocatalyst for Water Oxidation

Mengqi Yao, Baolong Sun, Lixiang He, Ni Wang, Wencheng Hu, Sridhar Komarneni

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Synthesis of highly efficient and stable electrocatalysts for oxygen evolution reaction remains a big challenge. Herein, we rationally designed a novel route, involving hydrothermal electrodeposition of Ni/Zn alloy and in situ electrochemical dealloying followed by sulfuration, to fabricate three-dimensional mesoporous nickel sulfide nanosheets assembled tightly on Ni foam for oxygen evolution reaction. The mesoporous Ni 3 S 2 nanosheets/Ni foam exhibited a highly mesoporous structure with a specific surface area of 60.1 m 2 g -1 and showed a low overpotential of 223 mV at a current density of 10 mA cm -2 with a small Tafel slope of 60.5 mV dec -1 this overpotential is superior to that of IrO 2 /Ni foam. As-prepared Ni 3 S 2 nanosheets/Ni foam achieved a high turnover frequency value of 0.61 mol O 2 s -1 at an overpotential of 500 mV. Impressively, the as-obtained catalyst possessed excellent conductivity and outstanding stability for over 240 h. The superior catalytic property could be ascribed to the rational synthetic process, morphology-controlled mesoporous structure, and highly exposed active sites. This paper presents an efficient route to fabricate porous nanosheets as stable and efficient electrocatalyst for water oxidation.

Original languageEnglish (US)
Pages (from-to)5430-5439
Number of pages10
JournalACS Sustainable Chemistry and Engineering
Volume7
Issue number5
DOIs
StatePublished - Mar 4 2019

All Science Journal Classification (ASJC) codes

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

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