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Comparative study of PtNi nanowire array electrodes toward oxygen reduction reaction by half-cell measurement and PEMFC test

Mardle, Peter, Thirunavukkarasu, Gnanavel, Guan, Shaoliang, Chiu, Yu-Lung and Du, Shangfeng 2020. Comparative study of PtNi nanowire array electrodes toward oxygen reduction reaction by half-cell measurement and PEMFC test. ACS Applied Materials and Interfaces 12 (38) , 42832–42841. 10.1021/acsami.0c11531

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Abstract

A clear understanding of catalytic activity enhancement mechanisms in fuel cell operation is necessary for a full degree translation of the latest generation of non-Pt/C fuel cell electrocatalysts into high-performance electrodes in proton-exchange membrane fuel cells (PEMFCs). In this work, PtNi nanowire (NW) array gas diffusion electrodes (GDEs) are fabricated from Pt NW arrays with Ni impregnation. A 2.84-fold improvement in the oxygen reduction reaction catalytic activity is observed for the PtNi NW array GDE (cf. the Pt NW array GDE) using half-cell GDE measurement in a 0.1 M HClO4 aqueous electrolyte at 25 °C, in comparison to only a 1.07-fold power density recorded in the PEMFC single-cell test. An ionomer is shown to significantly increase the electrochemically active surface area of the GDEs, but the PtNi NW array GDE suffers from Ni ion contamination at a high temperature, contributing to decreased catalytic activities and limited improvement in operating PEMFCs.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: American Chemical Society
ISSN: 1944-8244
Date of First Compliant Deposit: 18 August 2021
Date of Acceptance: 31 August 2020
Last Modified: 14 Oct 2021 20:47
URI: http://orca.cardiff.ac.uk/id/eprint/143515

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