Ionomer-free electrocatalyst using acid-grafted carbon black as a proton-conductive support

Ryo Yoshihara, Dan Wu, Yin Kan Phua, Akiyo Nagashima, Euiji Choi, Samindi Madhubha Jayawickrama, Shota Ishikawa, Xuanchen Liu, Gen Inoue, Tsuyohiko Fujigaya

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)

抄録

In the developments of the polymer membrane electrolyte fuel cells (PEMFCs), strategic design of their catalysts layer is a key to improve the performance and durability. Especially, interfacial structure of the electrocatalysts constructed by carbon support, platinum (Pt)-based nanoparticles and polymer electrolyte so called ionomer dominates the performance. It is known that the surface coverage of the ionomers onto the carbon-supported Pt nanoparticles generates overpotentials in the catalyst layer. To avoid this, an ionomer-free electrocatalyst is developed by functionalized surface of carbon supports, in which the support is covalently grafted to benzenesulfonic acid to facilitate the proton conduction on the carbon surface and Pt nanoparticles are attached to the acid-grafted carbon support. In single-cell measurements, although the ionomer-free electrocatalyst exhibits larger proton resistance than a conventional ionomer-based electrocatalyst, higher activity at low (<0.01 A cm−2) and high (>1.7 A cm−2) current densities were achieved owing to increased oxygen reduction reaction activity and decreased oxygen diffusion resistance, respectively. Elimination of the ionomer reduces both the interfacial overpotential as well as diffusion overpotential of the oxygen.

本文言語英語
論文番号231192
ジャーナルJournal of Power Sources
529
DOI
出版ステータス出版済み - 5月 1 2022

!!!All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • エネルギー工学および電力技術
  • 物理化学および理論化学
  • 電子工学および電気工学

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