Oxygen reduction reactivity of precisely controlled nanostructured model catalysts

Ken'ichi Kimijima, Akari Hayashi, Shun Umemura, Junichi Miyamoto, Koshi Sekizawa, Toshihiko Yoshida, Ichizo Yagi

研究成果: ジャーナルへの寄稿学術誌査読

8 被引用数 (Scopus)

抄録

Novel model catalysts to characterize the structural factors related to the activity of the oxygen reduction reaction (ORR) at the thin film electrode of electrocatalysts were proposed. Model catalysts were constructed of mesoporous carbon aerogels (CAGs) and ionomers of various molecular weights in order to estimate the effect of the nanostructure of the catalysts or catalyst layers on their ORR activity. The ORR kinetics of the Pt-deposited mesoporous CAG catalysts clearly depended on their pore sizes in the supports, and the smaller pore size resulted in a lower kinetic current for the ORR. However, the ORR kinetics even for the Pt-deposited CAG catalyst with the smallest pores (∼7 nm) was improved by the addition of an ionomer with a much lower molecular weight than Nafion, compared to that of the commercially available catalyst without rigid mesopores. These results indicated that the introduction of ionomers in the catalyst layer was a key to increasing the utility of a platinum catalyst and to develop a novel design of nanostructured catalyst layers.

本文言語英語
ページ(範囲)14675-14683
ページ数9
ジャーナルJournal of Physical Chemistry C
114
35
DOI
出版ステータス出版済み - 9月 9 2010
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • エネルギー一般
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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