期刊
ELECTROCHIMICA ACTA
卷 237, 期 -, 页码 171-176出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.03.197
关键词
Aerogel; Reduced graphene oxide; Urea oxidation; Electrocatalyst; Self assembly
资金
- Gyeonggi Regional Research Center [GRRC-Gachon 2016-B03]
A NiO-Fe2O3 based graphene aerogel was employed as a novel catalyst material for the electrochemical oxidation of urea. The three-dimensional aerogels were synthesized by metal ions (Ni2+ and Fe3+)-induced self-assembly using poly(vinyl alcohol) (PVA) as the structural scaffold. The NiO-Fe2O3/rGO/ PVA aerogels were characterized by scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The catalytic performance of the aerogels for urea electrooxidation in an alkaline medium was investigated by cyclic voltammetry. The NiO-Fe2O3/rGO/PVA aerogel electrode exhibited significant reduction of the onset oxidation potential (similar to 90 mV) compared to that of NiO/rGO/PVA. The NiO-Fe2O3/rGO/PVA aerogel electrode showed a peak current density of 44.6 mA cm(-2) at 0.33 M urea in 1.0 M KOH, which was 2.6-fold higher than that of NiO/rGO/PVA electrode. Moreover, the NiO-Fe2O3/rGO/PVA electrode showed only a 11% loss in the peak current after 200th cycles. (C) 2017 Elsevier Ltd. All rights reserved.
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