Designing an FeIII-doped nickel sulfide/carbon nanotube hybrid catalyst for alkaline electrolyte membrane water electrolyzers and Zn−air battery performances

Pandian Ganesan, Aleksandar Staykov, Hiroaki Shu, Mitsugu Uejima, Naotoshi Nakashima

Research output: Contribution to journalArticlepeer-review

Abstract

The development of an electrocatalyst with high performance using nonprecious metals/metal oxides as well as its applications in flexible and rechargeable Zn−air batteries and water electrolyzers is in strong demand from industries. In this study, we have designed and synthesized a new (Fe3NiS8δ)4+δ carbon nanotube (CNT) hybrid electrocatalyst and revealed that the catalyst shows a very high oxygen evolution reaction (1.55 V at 10 mA/cm2) and oxygen reduction reaction (E1/2 = 0.82 V vs RHE) performances. Based on the analyses by in situ electrochemical X-ray diffraction together with structure analysis software, in situ electrochemical Fourier transform infrared spectroscopy, transmission electron microscopy, and computer simulations, such a high performance is derived from the sulfur vacancies that were formed via the self-doped d−p orbitals of FeIII in (Fe3NiS8δ)4+δ. Here, we describe an adequate explanation about the role of the iron do in in the nickel sulfides in the catal st Furthermore the fabricated flexible and rechargeable Zn−air and water electrolyzer batteries using the catalyst show a low charge−discharge overpotential gap of 0.66 V and a 237 mA/cm2 current density at 1.9 V, which is very important for the development of a rechargeable Zn−air battery and water electrolyzer with a high performance. First-principles calculations are employed to investigate the reaction mechanisms and elucidate the effect of the CNT support for the catalytic activity.

Original languageEnglish
Pages (from-to)10961-10975
Number of pages15
JournalACS Applied Energy Materials
Volume3
Issue number11
DOIs
Publication statusPublished - Nov 23 2020

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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