Tailoring the hydrophilic and hydrophobic reaction fields of the electrode interface on single crystal Pt electrodes for hydrogen evolution/oxidation reactions

Syunnosuke Tanaka, Shohei Takaya, Tomoaki Kumeda, Nagahiro Hoshi, Kenji Miyatake, Masashi Nakamura

Research output: Contribution to journalArticlepeer-review

Abstract

Interfacial hydrophobic/hydrophilic reaction fields significantly affect various reactions at the electrode surface. The hydrogen evolution reaction (HER) and the hydrogen oxidation reaction (HOR) have been investigated on single crystal Pt electrodes modified with hydrophobic/hydrophilic cations and anion-exchange copolymers in alkaline solutions. In alkali metal hydroxide solutions, Pt (110) exhibits the highest HER/HOR activity in the low-index planes of Pt. On the low-index planes of Pt, the hydrophilicity of the alkali metal cation in the supporting electrolyte activates the HER/HOR depending on its hydration energy. Hydrophilic cations at the interface facilitate the extraction of hydrogen from the hydrated water. The modification of anion-exchange copolymers with a hydrophobic skeleton on Pt (110) further enhanced the HER/HOR activity. The hydrogen bonding network formed around the hydrophobic species facilitated the mobility of water molecules and the OH as the reactant/product of the HER/HOR. Appropriately forming hydrophilic and hydrophobic reaction fields at the interface improved the HER/HOR activity.

Original languageEnglish
Pages (from-to)28078-28086
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume46
Issue number55
DOIs
Publication statusPublished - 2021 Aug 10

Keywords

  • Anion exchange copolymer
  • Electrical double layer
  • Hydrogen evolution/oxidation reaction
  • Platinum
  • Single crystal electrode

ASJC Scopus subject areas

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

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