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Nafion-stabilised bimetallic Pt–Cr nanoparticles as electrocatalysts for proton exchange membrane fuel cells (PEMFCs)

Lookup NU author(s): Dr Gaurav GuptaORCiD



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


The current study investigated the unique combination of alloying (Pt with Cr) and Nafion stabilisation to reap the benefits of catalyst systems with enhanced catalytic activity and improved durability in PEMFCs. Pt–Cr alloy nanoparticles stabilised with Nafion were chosen in the current study owing to their higher stability in acidic and oxidising media at high temperatures compared to other Pt-transition metal alloys (e.g. Pt–Ni, Pt–Co). Two different precursor:reducing agent (1:10 and 1:20) ratios were used in order to prepare two different alloys, denoted as Pt–Cr 10 and Pt–Cr 20. The Pt–Cr 20 alloy system (with composition Pt80Cr20) demonstrated higher electrocatalytic activity for the oxygen reduction reaction compared to commercial Pt/C (TKK) catalysts. Accelerated stress tests and single cell tests revealed that Nafion stabilised alloy catalyst systems displayed significantly enhanced durability (only ∼20% loss of ECSA) compared with Pt/C (50% loss of ECSA) due to improved catalyst–ionomer interaction. Furthermore, the Pt–Cr 20 alloy system demonstrated a current density comparable to that of Pt/C making them promising potential electrocatalysts for proton exchange membrane fuel cells.

Publication metadata

Author(s): Gupta G, Sharma S, Mendes PM

Publication type: Article

Publication status: Published

Journal: RSC Advances

Year: 2016

Volume: 6

Issue: 86

Pages: 82635-82643

Online publication date: 25/08/2016

Acceptance date: 24/08/2016

Date deposited: 28/11/2016

ISSN (electronic): 2046-2069

Publisher: Royal Society of Chemistry


DOI: 10.1039/C6RA16025E


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