コバルト炭酸水酸化物の電子的および形態学的二重調節によるMnドーピングにより,全体的な水分解のための高効率で安定した二機能電解剤
Tang Tang1,2, Wen-Jie Jiang1,3, Shuai Niu1
1CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS) , Beijing 100190, China.
Journal of the American Chemical Society
|May 24, 2017
まとめ
この研究は,全般的な水分裂のための効率的な二機能電解剤として,新型のCo-Mn炭酸水酸化物 (CoMnCH) ナノシート配列を提示し,酸素進化反応 (OER) と水素進化反応 (HER) の両方で顕著な活性を達成します.
科学分野:
- 材料科学
- 電気化学
- キャタリシス
背景:
- 酸素進化反応 (OER) と水素進化反応 (HER) のための効率的で耐久性の高い非高貴な電気触媒の開発は,全体的な水分裂に不可欠です.
- 既存の電気触媒は,活動性,安定性,費用対効果の面で多くの課題に直面しています.
研究 の 目的:
- 効率的な全体的な水分分割のためのCo-Mn炭酸水酸化物 (CoMnCH) ナノシート配列に基づく二機能電解剤を開発する.
- コ基炭酸水酸化物の形態学,電子構造,および触媒性能に対するMnドーピングの影響を調査する.
主な方法:
- ニッケル発泡 (NF) のナノシート配列の合成
- 合成された材料の形態学,組成,電子構造の特徴.
- OERとHERの性能の電気化学的評価は,サイクル電圧測定とクロノアンペロメトリーなどの技術を用いて行われます.
主要な成果:
- 最適化されたCo1Mn1CH/NF電極は,30 mA cm−2で超低電位294 mVの優れたOER活性を示した.
- 二機能触媒は,OERの462mVの超電位で,1000mAcm−2の高い安定した電流密度を達成した.
- 10 mA cm−2で,Mnドーピングにより,OERとHERの活性が強化された.
- Co1Mn1CH/NFをアノドとカトドの両方として使用した2つの電極の電解機は,10 mA cm−2の電圧で安定した全体的な水分裂を示した.
結論:
- CoCHにおけるMnドーピングは,ナノシート形態と電子構造を効果的に調節し,OERとHERの固有の活性を増強します.
- CoMnCHナノシート配列は,効率的でスケーラブルな水解析のための非常に有望な非高貴な二機能電気触媒のクラスです.
- この研究は,水分裂における実用的な応用のための他の多金属炭酸水素の探索の道を開きます.
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