Issue 53, 2017

Mesoporous titanium and niobium nitrides as conductive and stable electrocatalyst supports in acid environments

Abstract

The stability of carbon-based catalyst supports represents one of the biggest challenges for the commercialisation of proton-exchange membrane fuel cells (PEMFCs). Metal nitrides are an attractive alternative to carbon-based supports, owing to their high bulk conductivity and acid stability. We report the electrochemical stability evaluation of high-surface-area metal nitrides in acidic electrolytes. Three-dimensional mesoporous titanium (TiN) and niobium nitride (NbN) thin films were prepared using block copolymer self-assembly and were evaluated without using any conductive carbon additives or a carbon-based substrate. Both TiN and NbN are stable and maintain conductivity in acidic electrolytes up to at least 0.85 V (NbN) and 1.4 V (TiN) vs. reversible hydrogen electrode (RHE) after 2000 cycles. We also deposited platinum on the TiN films and demonstrate the expected cyclic voltammogram features, indicating the nitride's utility as a catalyst support.

Graphical abstract: Mesoporous titanium and niobium nitrides as conductive and stable electrocatalyst supports in acid environments

Supplementary files

Article information

Article type
Communication
Submitted
27 Mme 2017
Accepted
26 Mot 2017
First published
26 Mot 2017

Chem. Commun., 2017,53, 7250-7253

Mesoporous titanium and niobium nitrides as conductive and stable electrocatalyst supports in acid environments

K. E. Fritz, P. A. Beaucage, F. Matsuoka, U. Wiesner and J. Suntivich, Chem. Commun., 2017, 53, 7250 DOI: 10.1039/C7CC03232C

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