Journal
ELECTROCHIMICA ACTA
Volume 103, Issue -, Pages 151-160Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.04.012
Keywords
Oxygen reduction reaction; Oxynitrides; Nanoporous electrodes; Cathode catalyst; Non-precious catalyst
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Funding
- Australian Research Council (ARC) through the ARC Centre of Excellence for Electromaterials Science (ACES)
- Deakin University's Central Research Grant Scheme (CRGS)
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Nanoporous molybdenum oxynitride has been synthesized and studied for the first time as an oxygen reduction catalyst in a 0.1 M KCl aqueous solution (pH 5.6). Modified electrodes containing the oxynitride catalyst, TIMCAL Super P (TM) Li carbon as a conducting carbon additive and polyvinylidene fluoride as a binder were prepared, and the ratios of the different components were studied in detail to yield the optimum composition. The oxygen reduction reaction mechanism has been analyzed by the Koutecky-Levich equation using a rotating disk electrode and is in concordance with a four-electron pathway for the molybdenum oxynitride catalyst. Rotating ring-disk electrode experiments have further confirmed the electrocatalytic performance of such oxynitrides toward oxygen reduction, determining an average production of H2O2 of just 2.35%. Finally, we have also compared the performance of vanadium and tungsten oxynitrides under the same conditions as the optimal molybdenum oxynitride. (C) 2013 Elsevier Ltd. All rights reserved.
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