A highly efficient and durable carbon nanotube-based anode electrocatalyst for water electrolyzers

Tsuyohiko Fujigaya, Yilei Shi, Jun Yang, Hua Li, Kohei Ito, Naotoshi Nakashima

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Iridium (Ir) nanoparticles with a uniform diameter of 1.1 ± 0.2 nm were homogeneously deposited on multi-walled carbon nanotubes (MWNTs) wrapped by polybenzimidazole (PBI), in which PBI enables efficient anchoring of the Ir nanoparticles. The Ir nanoparticles were electrochemically oxidized to afford Ir oxide (IrOx) and evaluated as an oxygen evolution reaction catalyst by half-cell measurements. The composite was also used as an anode electrocatalyst for proton exchange membrane water electrolyzers (PEMWEs). It was revealed that the IrOx on the PBI-wrapped MWNTs exhibited a very high electrocatalytic mass activity and durability even compared to the other state-of-the-art Ir-based catalysts, while the IrOx deposited on conventional carbon black showed only a poor durability.

Original languageEnglish
Pages (from-to)10584-10590
Number of pages7
JournalJournal of Materials Chemistry A
Volume5
Issue number21
DOIs
Publication statusPublished - 2017

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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