原子的に分散したFe3+サイトは効率的なCO2をCOに電還元する
Jun Gu1, Chia-Shuo Hsu2, Lichen Bai1
1Laboratory of Inorganic Synthesis and Catalysis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), EPFL-ISIC-LSCI, BCH 3305, Lausanne CH 1015, Switzerland.
Science (New York, N.Y.)
|June 15, 2019
まとめ
この研究は,二酸化炭素 (CO2) を一酸化炭素 (CO) に効率的に変換するための新しい鉄基触媒を導入します. 単原子の鉄触媒は 低超電位で高い活性を達成し 代用品である貴金属を上回る.
科学分野:
- 電気化学
- 材料科学
- カタリシス
背景:
- ゴールドナノマテリアルはCO2をCOに変換する最も活発な電気触媒です.
- 非貴金属の触媒は,この反応に限られた活性を示します.
研究 の 目的:
- CO2の電気減量のための高度に活性で費用対効果の高い触媒を開発する.
- CO2をCOに変換する単原子鉄の性能を調査する.
主な方法:
- 触媒活動と過剰電位を測定するための電気化学試験
- 活性部位と酸化状態を特定するために,X線吸収スペクトロスコーピーを操作します.
- 反応メカニズムを理解するための電気化学データ分析.
主要な成果:
- 分散した単原子の鉄部位を持つ触媒は,80 mVの超電位でCO生成を達成した.
- 部分電流密度は340mVの超電位で94mA/cm2に達した.
- 炭素基上にピロリック窒素で調整された離散のFe3+イオンとして識別された活性サイトは,+3酸化状態を維持する.
結論:
- 炭素基にN原子を配合した単原子Fe3+サイトは,CO2をCOに変換するための優れた電気触媒活性を示します.
- 強化された活動は,Fe2+サイトと比較して,より速いCO2吸収とより弱いCO吸収に起因する.
- この触媒は金基の触媒に代わる 有望な非貴金属である.
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