Journal
ELECTROCHIMICA ACTA
Volume 186, Issue -, Pages 239-244Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.10.126
Keywords
Hydrazine oxidation; Silver electrocatalyst; Carbon fiber cloth; Square wave potential method
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Funding
- National Natural Science Foundation of China [21403044]
- Heilongjiang Postdoctoral Fund [LBH-Z14211]
- China Postdoctoral Science Foundation [2014M561332]
- Major Project of Science and Technology of Heilongjiang Province [GA14A101]
- Project of Research and Development of Applied Technology of Harbin [2014DB4AG016]
- Fundamental Research Funds for the Central Universities [HEUCF20151004]
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Silver particles with microspheric structure are directly electrodeposited on carbon fiber cloth (CFC) substrate by square-wave potential electrodeposition method. The electrocatalytic behaviors of the Ag/CFC electrode toward hydrazine oxidation in alkaline solution are examined by cyclic voltammetry and chronoamperometry. An onset oxidation potential of -0.5 V and a peak current density of 30 mA cm(-2) are achieved in the solution containing 1.0 mol L-1 KOH and 20.0 mmol L-1 hydrazine. The microspheric structure of the Ag/CFC electrode provides large electroactive surface area, hence, abundant active sites are vacant for hydrazine oxidation. The calculated apparent activation energies at different potentials show that hydrazine electro-oxidation at higher potential has faster kinetics than that at lower potential. In addition, the transfer electron number of hydrazine oxidation reaction on the Ag/CFC electrode is close to four, suggesting hydrazine is almost completely electrooxidized on the electrode and the full use of hydrazine fuel is basically achieved. (C) 2015 Elsevier Ltd. All rights reserved.
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