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In situ electrochemical redox tuning of Pd-Co hybrid electrocatalysts for high-performance methanol oxidation: Strong metal-support interaction by Hao Lei; Qibo Zhang is a Chemistry article available to read on EtoBox.

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Construction of strong metal-support interaction (SMSI) is of fundamental interest in the preparation of supported metal nanoparticle catalysts with enhanced catalytic activity. Herein, we report a facile in situ electrochemical redox tuning approach to build strong interactions between metals and supports. As for a typical example, a composite electrocatalyst of Pd-Co hybrid nanoparticles directly developed on Ni substrate is found to follow a distinct surface self-reconstruction process in alkaline media via an in situ electrochemical redox procedure, which results in structural transition from the original nanoparticles (NPs) to nanosheets (NSs) coupled with a phase transformation of the Co component, Co → CoO/Co(OH). The SMSI is observed in the electrochemically tuned Pd-Co hybrid system and leads to significantly enhanced catalytic activity for methanol oxidation reaction (MOR) due to the modified atomic/electronic structure, increased surface area, and more exposed electroactive sites. Compared with commercial Pd/C catalyst, the electrochemically tuned Pd-Co hybrid catalyst with SMSI exhibits superior catalytic activity (2330 mA∙mg) and much better stability (remains 503 mA∙m

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Author

Hao Lei; Qibo Zhang

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Chemistry (Physical Sciences)