フルウォーター・スプリッティングのための高活性で安定したファイティック酸由来移行金属・フォスフィードの触媒
Gong Zhang1, Guichang Wang2, Yang Liu3
1University of Chinese Academy of Sciences, Beijing 100039, China.
Journal of the American Chemical Society
|November 1, 2016
まとめ
植物酸を使って合成されたトランジション・メタル・フォスフィード (TMP) 触媒は,効率的な完全な水分解の新しくシンプルな方法を提供します. 酸素の組み込みは導電性を高め,高貴金属なしで効果的な水素と酸素の進化反応を可能にします.
科学分野:
- 材料科学
- キャタリシス
- 再生可能エネルギー
背景:
- 移行金属酸化物 (TMP) は水分解の有望な触媒であり,エネルギー危機に対処する上で極めて重要です.
- 現在の合成方法には普遍性が欠けていて,触媒活性を増強するにはさらなる調査が必要です.
- 電子構造規制は,普遍的なTMP合成を開発するためのシンプルで重要なアプローチを提供します.
研究 の 目的:
- トランジション・メタル・フォスフィード (TMP) 触媒の新型で普遍的な合成方法を開発する.
- TMP に酸素原子を組み込むことが,水分解の触媒性能に与える影響を調査する.
- これらのTMPの実用的で高貴な金属のない水分解の応用の可能性を実証する.
主な方法:
- フィティック酸 (PA) の交結金属複合体の溶解によるTMPの製造.
- TMP構造に酸素原子を組み込む
- 酸性およびアルカリ性環境における水素進化反応 (HER) と酸素進化反応 (OER) の電気触媒試験
- TMPを柔軟な炭素布の基板に統合する.
主要な成果:
- 酸素の組み込みにより,TMPの電気伝導性が向上し,M-P結合の延長により触媒部位が活性化しました.
- MoP触媒は20 mA·cm−2で低HER過剰ポテンシャル (H2SO4では118 mV,KOHでは93 mV) を示した.
- CoP触媒は,10 mA·cm−2で280 mVのオーバーポテンシャルで効率的なOERを示した.
- 炭素布のTMPは,電子の移転を容易にし,触媒的活性を改善しました.
- アルカリ式電解機は,全体的な水分裂のために1.6Vで40mA·cm−2を達成した.
結論:
- 植物酸を用いた新型 Pyrolysis 方法は,酸素を含む TMP を合成するための普遍的な経路を提供します.
- 酸素の組み込みは,HERとOERの両方のTMPの触媒活性を強化するための重要な戦略です.
- 開発されたTMPは,高効率で実用的な貴金属のない水分分離装置の大きな可能性を示しています.
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