Methanol oxidation on Pt/CeO2@C–N electrocatalysts prepared by the in-situ carbonization of polyvinylpyrrolidone

Abstract

This research is aimed to improve the poor electron conductivity of CeO 2 as the catalyst support for methanol oxidation. Pt/CeO 2 catalyst coated with nitrogen-doped carbon layer has been prepared through a combined microwave-assisted polyol with in-situ carbonization of nitrogendoped carbon-coating process using polyvinylpyrrolidone as the nitrogen-doped carbon precursor. Electrochemical results show that Pt/CeO 2 catalyst coated with nitrogen-doped carbon layer has higher activity than the uncoated Pt/CeO 2 catalyst due to more uniform dispersion, electron-donating effects, and the superior electrical conductivity of the CeO 2 support enhanced by the nitrogen-doped carbon layer. Further, electrochemical results show that the optimal doped amount of polyvinylpyrrolidone is 20 wt%. The physical characteristics such as high-resolution transmission electron microscopy and X-ray photoelectron spectrometer have confirmed the existence of the nitrogen-doped carbon layer on CeO 2 .Graphical Abstract A novel Pt/CeO 2 catalyst coated with N-doped carbon layer has been successfully prepared through a combined microwave-assisted polyol with in-situ carbonization of N-doped carbon-coating process using polyvinylpyrrolidone (PVP) as the N-doped carbon precursor. The greatly improved activity and durability of Pt/ CeO 2 @C-N catalyst is mainly a consequence of more uniform dispersion, smaller size of Pt nanoparticles, and the superior electrical conductivity of the CeO 2 support enhanced by the N-doped carbon layer.

Preparation of Nitrogen and Phosphorus Doped Porous Carbon from Watermelon Peel as Supercapacitor Electrode Material

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Pt2CeO2 Heterojunction Supported on Multiwalled Carbon Nanotubes for Robust Electrocatalytic Oxidation of Methanol

“…Due to the effect of the added metal on the electronic structure, the Pt electronic state is changed to reduce the adsorption of poisonous intermediates (e.g., CO ads , COOH ads ). Among these alloy catalysts, the Pt-CeO 2 binary system has attracted much interest [ 11 , 12 , 13 ]. Herein, ceria nanorods with rich oxygen vacancies and rough surface have been induced by plasma surface engineering and used as Pt support.…”

Electrocatalytic activity of AuCeO2/C towards ethylene glycol oxidation and oxygen reduction reactions

“…Other positive properties of CeO 2 , such as low price, synergistic effect between CeO 2 and metal as well as tolerance to the CO poisoning, determine the choice of this oxide as an additive in the preparation of various catalysts [22,29,30]. CeO 2 is widely used for combining it with Pt, Pd or other oxides [31][32][33]. However, nanosized Au particles supported on metal oxides have been extensively studied because of their high reactivity in a variety of important catalytic reactions.…”