Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 46, Issue 49, Pages 25277-25283Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.05.045
Keywords
Methanol oxidation reaction; Dehydrogenation; Carbon supported Pt; Ion concentration; Distance between the Pt particles
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Funding
- Youth Innovation Fund of Guangdong Education Department of China [2020KQNCX046]
- Research Fund Program of Guangdong Provincial Key Lab of Green Chemical Product Technology [GC201808]
- Maoming petrochemical industry transformation and upgrading technology innovation public service platform of Guangdong Provincial Science and Technology Plan projects [2016B020211002]
- Maoming Science and Technology Planning Project [2018020]
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This study investigated the dehydrogenation step in MOR using low levels of platinum supported on carbon nanotubes. The concentration of H+ significantly affected the MOR activity of Pt catalysts supported by carbon nanotubes. Additionally, the effects of Pt particle size and the distance between Pt particles on the catalyst were explored. It was hypothesized that different Pt particle sizes required different numbers of particles for the dehydrogenation process.
The electro-catalytic methanol oxidation reaction (MOR) has received considerable research attention due to its importance in the development of direct methanol fuel cells. In this study, the dehydrogenation step in MOR was investigated using low levels of platinum (Pt) which supported on carbon nanotubes as a catalyst. The concentration of H+ had a significant effect on the MOR activity of Pt catalysts supported by carbon nanotubes (Pt/CNTs), indicating that the dehydrogenation process was a critical step in MOR for Pt/CNTs with low Pt loading. Furthermore, the effects of Pt particle size and the distance between the Pt particles were investigated. We suggested a hypothesis: for the Pt catalyst with large particle size, only a few particles were needed for dehydrogenation to proceed; for the Pt catalyst with small particle size, many Pt particles were needed to form a network for the dehydrogenation reaction, but when the Pt particles were close enough, only a few Pt particles were needed. Our study provided insight into the electro-catalytic activity of Pt/CNTs from a mechanistic perspective. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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