Nanometer-Sized MoS2 Clusters on Graphene Flakes for Catalytic Formic Acid Decomposition

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• 作者：Victor O. Koroteev ; Dmitri A. Bulushev ; Andrey L. Chuvilin ; Alexander V. Okotrub ; Lyubov G. Bulusheva
• 刊名：ACS Catalysis
• 出版年：2014
• 出版时间：November 7, 2014
• 年：2014
• 卷：4
• 期：11
• 页码：3950-3956
• 全文大小：474K
• ISSN：2155-5435

文摘

MoS₂ was deposited on graphene flakes via decomposition of MoS₃ in vacuum at different temperatures (500鈥?00 掳C). The materials obtained were tested for catalytic formic acid decomposition, giving mainly hydrogen and carbon dioxide. According to atom-resolved transmission electron microscopy study, a considerable amount of MoS₂ clusters with a mean size of 1 nm was formed on the graphene surface at 500 掳C. Simulation of the structure of a cluster revealed the presence of Mo-edge atoms. Raising the preparation temperature up to 800 掳C led to agglomeration of MoS₂ clusters and formation of thin crystalline MoS₂ particles 20鈥?0 nm in size. The sample enriched with the MoS₂ clusters showed 6 times higher catalytic activity at 160 掳C than the sample with the crystalline MoS₂ particles. This demonstrates that the observed nanometer-sized MoS₂ clusters are responsible for catalysis.

Keywords:

MoS₂ clusters; graphene; structure; formic acid decomposition; hydrogen production