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Preparation of three-dimensional porous Cu film supported on Cu foam and its electrocatalytic performance for hydrazine electrooxidation in alkaline medium

Authors :
Ran Liu
Ziyao Long
Guiling Wang
Kui Cheng
Ke Ye
Dianxue Cao
Wenping Zhang
Yinyi Gao
Source :
Materials Science and Engineering: B. 210:51-56
Publication Year :
2016
Publisher :
Elsevier BV, 2016.

Abstract

A three-dimensional porous copper film is directly deposited on Cu foam by an electrodeposition method using hydrogen bubbles as dynamic template (denoted as Cu/Cu foam). Its electrocatalytic activity toward hydrazine electrooxidation is tested by linear sweep voltammetry, chronoamperometry and electrochemical impedance spectroscopy. Compared with Cu foam, hydrazine electrooxidation on the Cu/Cu foam electrode shows that the onset oxidation potential displays a ~100 mV negative shift, the current density at −0.6 V raises about 14 times, the apparent activation energy and the charge transfer resistance reduce significantly. The increasing electrocatalytic performance for hydrazine electrooxidation is mainly caused by the highly porous structure of the Cu/Cu foam electrode which can provide a large surface area and make electrolyte access the electrocatalyst surfaces more easily. Hydrazine electrooxidation on the Cu/Cu foam electrode proceeds through a near 4-electron process.

Details

ISSN :
09215107
Volume :
210
Database :
OpenAIRE
Journal :
Materials Science and Engineering: B
Accession number :
edsair.doi...........f0e457cdc497feb3e02ade7c265a9dcc
Full Text :
https://doi.org/10.1016/j.mseb.2016.05.005