酸素還元反応の Pt を上回るナノ触媒:コア/シェル Ag(Au) /CuPd ナノ粒子のケース
Shaojun Guo1, Xu Zhang, Wenlei Zhu
1Department of Chemistry, Brown University , Providence, Rhode Island 02912, United States.
Journal of the American Chemical Society
|October 4, 2014
まとめ
銀と金のコア/シェルのナノ粒子は,酸素還元反応の触媒活性が強化され,プラチナを上回る. これらの新しい触媒は,燃料電池アプリケーションのための有望な非プラチナの代替品を提供します.
科学分野:
- マテリアルサイエンス 材料科学
- 電気化学 電気化学について
- ナノテクノロジー ナノテクノロジー
背景:
- ナノ粒子触媒の最適化には,電子構造と表面張りの制御が含まれます.
- プラチナベースの触媒は,酸素還元反応の標準ですが,高価です.
研究 の 目的:
- 新しいコア/シェルM/CuPd (M = Ag,Au) ナノ粒子触媒の設計と合成を行う.
- プラチナと比較して,酸素還元反応を触媒化する効率を評価するために.
主な方法:
- 理論的な予測のための密度関数理論 (DFT) 計算.
- コレデクションによるモノディスパースのM/CuPdナノ粒子の合成.
- 0.1 M KOHで酸素還元反応の電気触媒評価.
主要な成果:
- DFTは,M/CuPd NPの最適な表面張力と組成を予測した.
- Ag/CuPdとAu/CuPdを合成したナノ粒子で,殻の厚さや組成が制御されています.
- Ag/Cu37Pd63およびAu/Cu40Pd60触媒は,商用Pt触媒の3倍以上の質量活性を示した.
結論:
- コア/シェルM/CuPdナノ粒子は,酸素還元反応の優れた触媒性能を示しています.
- これらのナノ粒子は,電触媒化のための有望な非プラチナの代替品を表しています.
- ナノ粒子の組成と殻の厚さの調整は,触媒効率を高めるための鍵です.
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