Issue 37, 2022

Platinum deposition on functionalised graphene for corrosion resistant oxygen reduction electrodes

Abstract

Graphene-related materials are promising supports for electrocatalysts due to their stability and high surface area. Their innate surface chemistries can be controlled and tuned via functionalisation to improve the stability of both the carbon support and the metal catalyst. Functionalised graphenes were prepared using either aryl diazonium functionalisation or non-destructive chemical reduction, to provide groups adapted for platinum deposition. XPS and TGA-MS measurements confirmed the presence of polyethyleneglycol and sulfur-containing functional groups, and provided consistent values for the extent of the reactions. The deposited platinum nanoparticles obtained were consistently around 2 nm via reductive chemistry and around 4 nm via the diazonium route. Although these graphene-supported electrocatalysts provided a lower electrochemical surface area (ECSA), functionalised samples showed enhanced specific activity compared to a commercial platinum/carbon black system. Accelerated stress testing (AST) showed improved durability for the functionalised graphenes compared to the non-functionalised materials, attributed to edge passivation and catalyst particle anchoring.

Graphical abstract: Platinum deposition on functionalised graphene for corrosion resistant oxygen reduction electrodes

Supplementary files

Article information

Article type
Paper
Submitted
29 apr 2022
Accepted
20 aug 2022
First published
31 aug 2022
This article is Open Access
Creative Commons BY license

J. Mater. Chem. A, 2022,10, 20121-20127

Platinum deposition on functionalised graphene for corrosion resistant oxygen reduction electrodes

N. Rubio, T. Suter, Z. Rana, A. J. Clancy, S. Masuda, H. Au, G. Coulter, P. Sirisinudomkit, P. F. McMillan, C. A. Howard, C. Mattevi, D. J. L. Brett and M. S. P. Shaffer, J. Mater. Chem. A, 2022, 10, 20121 DOI: 10.1039/D2TA03487E

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