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Hydrogen Production and Utilization in a Membrane Reactor
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酸化バイオマスの利用を統合した水分分割による分離された水素生産のための一般戦略
Bo You1, Xuan Liu1, Nan Jiang1
1Department of Chemistry and Biochemistry, Utah State University , Logan, Utah 84322, United States.
Journal of the American Chemical Society
|September 23, 2016
まとめ
この研究はバイオマスアップグレードと水素生産を統合し,酸素の進化を価値ある有機酸化で置き換えます. このアプローチはエネルギー効率を高め,危険な副産物を避け,貴重な化学物質とクリーンな水素を生成します.
科学分野:
- 電気化学
- 材料科学
- 緑の化学
背景:
- 従来の水電解はH2とO2を同時に生成し,酸素進化反応 (OER) によるガス分離を必要とし,低効率である.
- OERは反応性酸素種 (ROS) に繋がり,デバイスの分解と早めの故障を引き起こします.
- バイオマスの直接的酸化は,付加価値のある製品の生成のためのOERの潜在的な代替案を提供します.
研究 の 目的:
- 酸化バイオマスアップグレードと水分解による分離された水素生成を統合するための一般的なコンセプトを開発する.
- 水素の同時生産とバイオマスの利用のための新しい二機能電気触媒の使用を調査する.
- 効率と製品価値の観点から,この統合されたアプローチが従来の水電解に優れていることを示す.
主な方法:
- 階層的に多孔なNi3S2/Ni泡 (Ni3S2/NF) の二機能電気触媒が合成され,特徴づけられた.
- 5つの代表的なバイオマス基板 (エタノール,ベンジルアルコール,フルフラル,フルフリルアルコール,および5-ヒドロキシメチルフルラル (HMF)) を酸化強化に使用した.
- 電気触媒性能は,セル電圧,電流密度,ファラダイの効率,および製品の選択性を測定することによって評価されました.
主要な成果:
- 試験した5つのバイオマス基板は,OERよりも低い過剰ポテンシャルで付加価値の液体製品に酸化されました.
- HMFを2,5-フランジカルボキシル酸 (FDCA) に電気触媒による酸化が特に効果的であり,100 mA cm-2で ~200 mVのセル電圧を低下させた.
- Ni3S2/NF触媒は,H2とFDCAの両方の生産に際して,優れた耐久性と,ほぼユニットFaradaic効率を示しました.
結論:
- 水素進化反応 (HER) と酸化バイオマスの価値化を統合することで,従来の水解の優れた代替手段を提供できます.
- この方法では,爆発性H2/O2混合物とROSの形成を避け,貴重な化学物質と水素を生成します.
- Ni3S2/NFのような地球に豊富な電解剤の使用は,エネルギー変換の効率と経済性を最大化します.
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