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高電流密度における格子酸素駆動型酸素発生の安定化に向けた欠陥-界面カップリング

Shujie Liu1, Mao Sun2, Letian Dai1

  • 1Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan, PR China.

Nature communications
|January 29, 2026
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まとめ

効率的な水電解のための高度な触媒開発は、クリーンな水素製造にとって極めて重要である。本研究では、格子酸素を活性化し、酸素発生反応において高い活性と安定性を示す新規NiFe LDH/FeMoOヘテロ構造触媒を紹介する。

キーワード:
水電解酸素発生反応触媒NiFe LDHFeMoOヘテロ構造格子酸素クリーン水素

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科学分野:

  • 材料科学
  • 電気化学
  • 再生可能エネルギー

背景:

  • 工業用水電解には、酸素発生反応（OER）のための活性で安定した触媒が必要です。
  • 大規模なクリーン水素製造のための効率的な触媒の開発は、依然として大きな課題です。

研究 の 目的:

  • 効率的で耐久性のある酸素発生のための新規ヘテロ構造触媒の設計と調査。
  • ヘテロ構造触媒における格子酸素活性化メカニズムの探求。

主な方法:

  • Fe2(MoO4)3上に固定化されたNiFe層状二重水酸化物（LDH）ナノシートの合成。
  • 1 M KOH中でのOERに対するNiFe LDH/FeMoO触媒の電気化学的特性評価。
  • 太陽光水素変換効率を評価するために、触媒を太陽光発電電解槽に組み込んだ。

主要な成果:

  • NiFe LDH/FeMoOヘテロ構造触媒は、2 A cm⁻² において316 mVという低過電圧で高いOER活性を示しました。
  • 触媒は3,000時間以上の優れた長期安定性を示しました。
  • 触媒を太陽光発電電解槽に使用した場合、20.15%の太陽光水素変換効率が達成されました。

結論:

  • ヘテロ構造触媒は、酸素空孔と内部電場を介して格子酸素を効果的に活性化し、OER性能を向上させます。
  • この研究は、水電解のための安定した触媒を開発するための有望な戦略を提示します。
  • この発見は、再生可能エネルギーと水電解を統合してスケーラブルなクリーン水素製造を行うことを支持するものです。