メタステーブル・オーダーメタリック・エレクトロカタリストの室温高速合成
Yunfei Wang1, Du Sun1, Tomojit Chowdhury2
1Department of Materials Science and Engineering , Johns Hopkins University , Baltimore , Maryland 21218 , United States.
Journal of the American Chemical Society
|January 17, 2019
まとめ
研究者は,オーダーされたインターメタリックパラジアム-ビスムート (Pd31Bi12) 触媒のための新しい室温電気化学合成を開発しました. この新しい触媒は,酸素還元反応の例外的な活性と安定性を表しています.
科学分野:
- 材料科学
- 電気化学
- ナノテクノロジー
背景:
- オーダーメタル合金は電気化学反応のための有望な高性能材料です.
- オーダーメタリックの従来の合成は,金属拡散のための高い活性化エネルギーバリアのために高い温度と長い反応時間を要求します.
研究 の 目的:
- オーダーメタリックナノ構造のための新しい,迅速な室温合成方法を開発する.
- 合成された金属間パラジウムビスムート (Pd31Bi12) の電気化学的触媒活性と安定性を調査する.
主な方法:
- メタステーブルなオーダーメタリックPd31Bi12の合成には,直接電気化学的堆積が用いられた.
- 合成は室温で行われ,数分で完了した.
- 酸素還元反応 (ORR) の電解活性と長期的な安定性を評価した.
主要な成果:
- この研究では,室温でメタステーブルなオーダーメタリックPd31Bi12を成功裏に合成した.
- Pd31Bi12は,商用プラチナおよびパラジウムナノ触媒と比較して,水への酸素還元に著しく高い特異活性 (35倍以上) を示した.
- 触媒は1万回のサイクル後に高い活性と結晶性を維持し,優れた安定性を示した.
結論:
- 新しい効率的な室温電気化学的方法により,オーダーメタリックの迅速な合成が可能になります.
- 合成されたPd31Bi12は,酸素減少のための非常に活発で安定したパラジアムベースの触媒です.
- この研究は,高度な金属間材料の触媒発見と合成のための新しい道を開きます.
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