Journal
MATERIALS RESEARCH BULLETIN
Volume 139, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2021.111268
Keywords
Carbon supports; Silicon dioxide; Oxygen reduction reaction; Coating
Categories
Funding
- National Natural Science Foundation of China [U1710112]
- State Key Laboratory of Coal Conversion [2020BWZ001, J20-21-909]
- Institute of Coal Chemistry, Chinese Academy of Science
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The research involves coating carbon nanoparticles with a SiO2 thin-layer to create the Pt/SiO2-C catalyst, which exhibits excellent ORR activity and anti-poisoning ability in acidic media.
Herein, a SiO2 thin-layer is coated on the surface of carbon nanoparticles. Such a composite is further utilized as the support to load Pt nanoparticles (Pt/SiO2-C). This Pt/SiO2-C catalyst features an improved interaction between Pt nanoparticles and the stable SiO2 thin-layer. In acid media, an optimal Pt/SiO2-C catalyst displays significantly improved ORR activity (e.g., a half-wave potential of 0.81 V vs. RHE and a limiting diffusion current of 5.55 mA cm(-2)) and enhanced ability towards CO andmethanol anti-poisoning. Such performance is superior to the commercial Pt/C catalysts, Pt/carbon nanoparticle based catalysts, and Pt catalysts deposited on other supports. As predicted by density functional theory calculations (DFT), such high ORR performance is mainly due to the reduced free energy barrier, derived from the hydrophilic of SiO2 thin-layer.
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