中性水中の優れた電解水素進化のための移行金属の汎用表面工学
Bo You1, Xuan Liu1, Guoxiang Hu2
1Department of Chemistry and Biochemistry, Utah State University , Logan, Utah 84322, United States.
Journal of the American Chemical Society
|August 12, 2017
まとめ
研究者は,中性水中の水素進化反応 (HER) を大幅に促進する,移行金属のための新しい表面窒素修正を開発しました. この低コストの方法は 将来のエネルギーソリューションのために 太陽光から化学物質への変換を強化します
科学分野:
- 材料科学
- 電気化学
- カタリシス
背景:
- 低コストのハイブリッドシステムの開発は 将来のエネルギー需要に不可欠です
- 中性介質における水素進化反応 (HER) は,しばしば非貴金属の移行金属触媒によって運動的に制限される.
- 触媒のインターフェースの調整は,HERの触媒運動の強化の鍵です.
研究 の 目的:
- 中性水中の水素生成を改善するために,移行金属触媒の一般的な表面改変戦略を開発する.
- 窒素改変がHERの性能を高めるメカニズムを調査する.
- 自然光合成を模倣した 効率的な太陽光化学変換を実現します
主な方法:
- 様々な移行金属 (Fe,Co,Ni,Cu,Ni-Co合金) の表面窒素改変のための簡単な低温アンモニア炭酸処理
- シンクロトロンX線吸収光譜 (XAS) を含む物理化学的特徴づけ.
- 密度関数理論 (DFT) 計算と電気化学性能試験
主要な成果:
- 表面窒素の改変は,その塊の組成を変更することなく,様々な移行金属に成功裏に適用されました.
- 窒素改変ニッケル (N-Ni) は,pH7のHERに対して10 mA cm−2で,非常に低い64 mVの過剰ポテンシャルを示した.
- このN-Ni触媒は,報告された中性 HERの非貴重電触媒の中で最高の性能を示しています.
- DFTの計算によると,表面窒素は水吸収と解離を容易にする.
結論:
- 表面の窒素改変は,中性介質の非貴金属のHER運動を高める非常に効果的な戦略です.
- N-Ni触媒は効率的な水素生成のための電気触媒の重要な進歩を表しています.
- このアプローチは,低コストで持続可能な太陽光から化学エネルギーへの変換システムの有望な経路を提供します.
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