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総合的な水分裂のための地球豊富な分子Z-スキーム光電化学セル
Christopher D Windle1, Hiromu Kumagai2, Masanobu Higashi3
1Laboratoire de Chimie et Biologie des Métaux , Université Grenoble Alpes , CNRS UMR 5249, CEA, 17 rue des Martyrs , F-38054 Grenoble Cedex, France.
Journal of the American Chemical Society
|May 29, 2019
まとめ
研究者らは,銅ガリウム酸化物 (CuGaO2) にコグラフトされた有機染料と触媒を用いて,効率的な分子光電極を開発した. この高貴な金属のないシステムは,高効率の太陽から水素への変換をZ-スキームの構成で達成します.
科学分野:
- 材料科学
- 光触媒
- 再生可能エネルギー
背景:
- 光電化学 (PEC) による水分解は,持続可能な水素生産に不可欠です.
- 効率的で安定した 費用対効果の高い光学カトドの開発は 重要な課題です
- 銅ガリウム酸化物 (CuGaO2) は,PECアプリケーションのp型半導体として有望である.
研究 の 目的:
- 水素 (H2) 生産のための効率的な分子光電極を設計する.
- CuGaO2ベースの光電極の性能をNiOと比較して調査する.
- 総合的な水分分割のためのZ-スキーム PECシステムを構築し,評価する.
主な方法:
- プッシュプル有機染料とコバロキシム触媒をNiOとCuGaO2基板にコグラフティングする.
- 分子光電極と光電極の製造
- 可視光の下でのZ型PECセルにおける光電極性能の特徴化.
主要な成果:
- CuGaO2基の光電極は,NiO基の光電極よりも4倍高い光電流密度とよりポジティブな発生可能性を誇示した.
- 最適化されたCuGaO2光電極は,H2の生成に80%以上のファラダイク効率を達成した.
- Z-スキームのPEC細胞は,適用されたバイアスなしで,可視光下でのpH7で,それぞれ87%と88%のファラダイク効率でH2とO2を生成した.
結論:
- CuGaO2は,PEC水分裂における分子光電極のための優れた半導体である.
- 開発された高貴金属のないZ-スキームシステムは,太陽光から水素への高効率化 (5.4 × 10-3%) を示しています.
- この研究は 地球に豊富に存在する 分子ベースの水分分離技術の 重要な進歩を表しています
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