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Ag@MoS₂ 単層MoS₂の水素進化活性サイトを明らかにするSERSプラットフォームとしてのコアシェルヘテロ構造

Junze Chen¹, Guigao Liu¹, Yue-Zhou Zhu²

¹Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.

Journal of the American Chemical Society

|March 26, 2020

まとめ

研究者はモリブデン二硫化物 (MoS2) 触媒の電気化学的水素進化反応 (HER) の活性部位を特定した. 表面強化ラーマン光譜 (SERS) により,MoS2の硫黄原子がHER触媒の鍵となることが明らかになった.

科学分野:

材料科学
カタリシス
電気化学

背景:

効率的な触媒の設計には触媒反応の仕組みを理解することが重要です
モリブデン二酸化物 (MoS2) は,電気化学的水素進化反応 (HER) の有望な触媒であるが,原子レベルのメカニズムは不明である.

研究の目的:

MoS2触媒による電気化学 HERの原子レベルのメカニズムを解明する.
原子レベルでの触媒過程の現地調査のための方法を開発する.

主な方法:

単層のMoS2コーティングの多面体銀 (Ag) コア・シェル・ヘテロ構造 (Ag@MoS2) を湿化学法で合成した.
Ag@MoS2ヘテロ構造は,プラズモンのAgコアにより,表面強化ラーマン光譜 (SERS) のプラットフォームとして利用されました.

主要な成果:

In situ SERSは,HER中にMoS2表面でのS-H結合形成のリアルタイムスペクトル学的証拠を提供した.
MoS2表面の硫黄 (S) 原子が電気化学 HERの活性部位として作用することを確認した.

結論:

MoS2の電気化学的HERの触媒活性部位を原子レベルで明らかにした.
触媒のメカニズム的研究のためのプラズモンの異質構造に関する in situ SERS の有用性を実証する.

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