Designing durable, highly active supported Pt catalysts has attracted tremendous interest in recent years due to their high electrocatalytic activities and stability in methanol oxidation reactions (MORs). Herein, we report an eco-friendly synthetic strategy for obtaining Pt/CeO2composite microspheres, which are highly active and durable catalysts for MOR. The porous CeO2microspheres were prepared through a hydrothermal method using the Piper longum fruit extract, which is an environmentally friendly solvent. The Pt nanoparticles (NPs) with an average size of ∼5 nm dispersed on CeO2microspheres were obtained by the chemical reduction of Pt2+ions at room temperature. It was found that the supported Pt NPs are strongly coupled through strong metal-support interactions (SMSIs), which promoted the formation of oxygen vacancies (OVs) and increased the concentration of active Ce3+sites. Owing to the presence of high OVs and of Ce3+species, the Pt/CeO2microsphere catalyst revealed enhanced MOR performance, with specific activity (SA) as high as 36.37 mA/cm2and mass activity (MA) of 229.44 mA/mg, which are substantially higher than those of commercial catalysts such as Pt/C and Pt/CeO2prepared with commercial CeO2nanoparticles. Moreover, the resultant catalyst showed excellent durability, retaining about 76.2% of its initial current density even after 5000 potential cycles. The used green extract-mediated synthesis process can be a promising alternative to conventional methods for the rational design of highly active metal nanoparticle-supported catalysts for heterogeneous catalysts.
|Number of pages||13|
|Journal||Journal of Physical Chemistry C|
|Publication status||Published - 2022 Nov 10|
Bibliographical noteFunding Information:
This work was supported (in part) by the Yonsei University Research Fund (Yonsei Frontier Lab. Young Researcher Supporting Program) of 2022. S.K.K. acknowledges CONACyT, Mexico, for the Programa Investigadoras e Investigadores por México del CONACYT project (Project No. 649). U.P. thanks CONACyT, Mexico, for its help extended through grant CB 2017-2018/A1-S-26720.
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films