Fe2Pの表面ヒドリドは,低超電位でCO2を減少させる:エチレングリコールへの選択性を制御する
Karin U D Calvinho1, Abdulaziz W Alherz2, Kyra M K Yap1
1Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, New Jersey 08854, United States.
Journal of the American Chemical Society
|December 9, 2021
まとめ
鉄酸化物 (Fe2P) は,二酸化炭素をエチレングリコールのような多炭素製品に効率的に還元する. CO2RRメカニズムに関する新しい洞察を提供している.
科学分野:
- 電気化学
- カタリシス
- 材料科学
背景:
- 二酸化炭素をマルチカーボン製品に減らすための効率的な電気触媒は極めて重要ですが,高超ポテンシャルと低選択性の課題に直面しています.
- 地球に豊富な触媒は,貴金属ベースのシステムの限界を克服するために求められます.
研究 の 目的:
- 鉄酸化物 (Fe2P) を地球に豊富に存在する電気触媒として,CO2をマルチ炭素製品に還元するために導入する.
- 反応メカニズムと製品の選択性を制御する要因,特に水素の役割と応用可能な可能性を調査する.
主な方法:
- 電気化学 CO2 還元反応 (CO2RR) 実験
- グランド カノニカル-DFT (GC-DFT) 計算.
- 中間種と表面ヒドリド結合親和性の分析
主要な成果:
- Fe2Pは0VのC2-C4製品に対して,総CO2RRの53%のファラダイ効果を示した.
- 製品の選択性はエチレングリコールにシフトし,負のバイアスが増加しました.
- GC-DFTと実験では,最初の中間物質としてCOではなく,イオン化水素が重要な役割を果たしていることが明らかになった.
- 水素結合は負バイアスで弱まり,C2の選択性と水素進化反応 (HER) の速度に影響する.
結論:
- 適用されたポテンシャルによって調節されるイオン化水素の形成と結合親和は,CO2RRにおける炭素産物の分布を決定する.
- ハイドリドの種化を理解すると,移行金属のリン酸のCO2RRメカニズムに関する重要な洞察が得られます.
- Fe2Pは,選択的なCO2変換のための地球に豊富な触媒として有望である.
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