Overvoltage reduction in membrane Bunsen reaction for hydrogen production by using a radiation-grafted cation exchange membrane and porous Au anode

Shin ichi Sawada, Takehiro Kimura, Haruyuki Nishijima, Takehide Kodaira, Nobuyuki Tanaka, Shinji Kubo, Shin ichiro Imabayashi, Mikihiro Nomura, Tetsuya Yamaki

Research output: Contribution to journalArticle

Abstract

An electrochemical membrane Bunsen reaction using a cation exchange membrane (CEM) is a key to achieving iodine-sulfur (IS) thermochemical water splitting for the mass-production of hydrogen. In this study, we prepared a radiation-grafted CEM with a high ion exchange capacity (IEC) and a highly-porous Au-electroplated anode, and then used them for the membrane Bunsen reaction to reduce cell overvoltage. The high ionic content of our CEM led to low resistivity for proton transport, while the high porosity of the electrode led to a large effective surface area for anodic SO2 oxidation. The cell overvoltage for the membrane Bunsen reaction was significantly reduced to 0.21 V at 200 mA/cm2, one-third of that achieved using a commercial CEM and non-porous anode. From the analysis of the current-voltage characteristics, the grafted CEM was demonstrated to play a dominant role in the overvoltage reduction compared to the porous Au anode.

Original languageEnglish
Pages (from-to)13814-13820
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume45
Issue number27
DOIs
Publication statusPublished - 2020 May 18

Keywords

  • Cation exchange membrane
  • Cell overvoltage
  • Membrane Bunsen reaction
  • Porous anode electrode
  • Radiation grafting

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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