表面ヒドロキシルの電気化学的CO2減少における活性と安定性における重要な役割
Wanyu Deng1, Lei Zhang1, Lulu Li1
1Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology , Tianjin University , Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072 , China.
Journal of the American Chemical Society
|February 5, 2019
まとめ
オキシド (SnOx) 触媒の表面ヒドロキシルを最適化すると,二酸化炭素電還元 (CO2ER) が強化される. 制御されたヒドロキシル覆いは,二酸化炭素の吸収と炭酸性製品の選択性を高め,触媒の自己減少を防止します.
科学分野:
- 電気化学
- 材料科学
- カタリシス
背景:
- 金属酸化物の表面ヒドロキシルは,CO2電還元反応 (CO2ER) の性能に不可欠である.
- 表面ヒドロキシルの正確な役割を理解することは,効率的な触媒の設計の鍵です.
研究 の 目的:
- CO2ERのSnOx触媒に対する表面ヒドロキシル覆いの効果を調査する.
- 炭酸性製品のための高いファラダイク効率を持つ安定したSnベースの触媒を開発する.
主な方法:
- SnOxをモデルシステムとして使った.
- 局所的に弱体化された全反射面強化赤外線吸附スペクトロスコーピー (ATR-SEIRAS) を使用した.
- 密度関数理論 (DFT) の計算を行った.
主要な成果:
- 表面ヒドロキシルの適度な量は,水素結合によってCO2の吸収を促進する.
- 高いヒドロキシル覆いは,Sn-OHの自己減少につながり,CO2の減少と競合する.
- 炭酸性製品の93.1%のファラダイク効率を持つ安定したSn分岐触媒を達成した.
結論:
- 表面ヒドロキシル覆面とCO2ER活動との間の定量的な相関を確立した.
- 触媒の安定性と性能を改善するために表面ヒドロキシルを調節する戦略を示した.
- CO2ERのための他の金属酸化物触媒の設計のための洞察を提供します.
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