Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 259, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118060
Keywords
Platinum; Nanocomposites; Ethanol oxidation; In situ nuclear magnetic resonance
Funding
- National Natural Science Foundation of China [U1632274, 21505109, 11775184, 21706222]
- Fundamental Research Funds for the Central Universities [20720160074]
- Natural Science Foundation of Fujian Province [2018J01008]
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In this work, highly active MoS2 nanoflowers/graphene nanosheets (GNS) composites are successfully prepared through a simple hydrothermal method and are employed as Pt supports to prepare Pt/MoS2/GNS for ethanol oxidation. The catalyst is characterized both physically and electrochemically to investigate the effect of MoS2/GNS on Pt. Moreover, in situ electrochemistry - nuclear magnetic resonance, with the strength in structural characterization, quantitative analysis, and real-time measurement, is carried out to monitor molecular changes of reaction products and elucidate reaction mechanism of ethanol oxidation reaction, providing sampling resolution of 4s. Significantly, a small size of 5.4 nm Pt decorated Pt/MoS2/GNS is achieved. Pt/MoS2/GNS exhibits 2.1-fold increase in electrochemical active surface area, 2.2-fold increase in catalytic activity, and 2.0-fold increase in durability compared to commercial Pt/C during ethanol oxidation, which can be attributed to the synergistic effect of the interconnected nanoflower-on-nanosheet structure of MoS2/GNS, the better dispersion of Pt nanoparticles, and the interactions between substrate materials and Pt. The results suggest that Pt/MoS2/GNS could be an alternative electrocatalyst for efficient ethanol oxidation reaction. This work provides a promising strategy in the synthesis and monitoring of composite materials as high-performance ethanol oxidation catalysts.
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