アルカリ性電解質における水素酸化のための高活性電気触媒としてのBCC相性PdCu合金
1Department of Chemical and Biological Engineering , Iowa State University , 618 Bissell Road , Ames , Iowa 50011 , United Sates.
Journal of the American Chemical Society
|November 7, 2018
まとめ
効率的なアノド触媒の開発は,アニオン交換膜燃料電池にとって極めて重要です. BCC相のPdCu合金ナノ粒子は,水素酸化反応 (HOR) の活性が20倍改善され,有望な解決策を示しています.
科学分野:
- 材料科学
- 電気化学
- キャタリシス
背景:
- アニオン交換膜燃料電池 (AEMFC) は,アルカリ的環境における水素酸化反応 (HOR) のための効率的なアノド触媒を必要とします.
- 現在のアノド触媒は,アルカリ性電解質のHOR運動が遅いため,AEMFCの性能と費用対効果を阻害する課題に直面しています.
研究 の 目的:
- AEMFCの潜在的なアノド触媒としてBCC相のパラジウム銅 (PdCu) 合金ナノ粒子を合成し,特徴づけること.
- 塩基性電解質におけるPdCuナノ粒子のHOR活性に対する結晶構造の影響を調査する.
主な方法:
- PdCu合金ナノ粒子の湿った化学合成に続いて,重要な熱処理を行います.
- 水晶構造の変換を分析するために,高エネルギーX線微分法 (HE-XRD) を用いる.
- 表面結合特性を理解するための密度関数理論 (DFT) の計算.
主要な成果:
- BCC段階のPdCuナノ粒子は,FCC段階の対称性と比較して,質量および特定のHOR活動が20倍まで増加しました.
- BCC- PdCuのHOR活動は,アルカリの電解質におけるPd/ CおよびPt/ C触媒よりも著しく高かった.
- DFTの計算は,Ptに似たBCC-PdCu表面上の最適化されたHとOH結合強度を示した.
結論:
- PdCu合金ナノ粒子のBCC結晶構造は,アルカリ媒体のHOR活性を強化する鍵です.
- 最適化されたHとOH結合は,触媒性能を相乗的に高め,BCC-PdCuをAEMFCにとって有望なアノド触媒にする.
- この研究は,効率的なHOR触媒の結晶構造変換による触媒開発の新しいアプローチを提示しています.
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