The influence of different synthesis parameters on CeO 2 and Pt nanoparticle (NP) deposition on Ketjenblack carbon (C(KB)) was examined. The Pt NP diameter (3.1–4.1 nm) was not influenced by CeO 2 synthesis parameters. The CeO 2 NPs synthesized using ultrasound sonication contribute to a better durability of the Pt–CeO 2 /C against CO poisoning. In contrast, CeO 2 synthesized using the microwave heating method contributes to better methanol oxidation reaction (MOR) activity at low electrode potential. Synthesis parameters of CeO 2 and Pt NPs developed for the C(KB)-based catalysts were applied for C(Cr 3 C 2 )-based catalysts. The Pt NP diameter of C(Cr 3 C 2 )-based catalysts was slightly higher (7.2 nm) as some Pt NPs were agglomerated. The C(Cr 3 C 2 ) support facilitates the MOR and CO stripping, especially in the case of the Pt/C on C(Cr 3 C 2 ) support. The MOR activity at 0.85 V of Pt NPs on the C(Cr 3 C 2 ) support is as good as the MOR activity for the best Pt–CeO 2 on the C(KB) support. The C(Cr 3 C 2 ) support also improves the CO removal from the Pt surface. All the synthesized catalysts had better MOR activity than the commercial Pt/C(Vulcan) catalyst. The oxygen reduction reaction activity of Pt–CeO 2 /C catalysts with higher CeO 2 content synthesized with the microwave heating method was very good.
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Nguyen et al. (2024) studied this question.
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