Journal
ELECTROCHIMICA ACTA
Volume 259, Issue -, Pages 77-85Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.10.152
Keywords
Mesoporous NiCo2O4/CX; Methanol electro-oxidation; Electrocatalyst; Physicochemical properties
Categories
Funding
- Beni-Suef University, PSAS
- STDF [12711, 14970]
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A new nickel cobaltite/carbon xerogel nanocomposite (NiCo2O4/CX) is obtained by preparing carbon xerogel (CX) by using sol- gel technique followed by growing the NiCo2O4 nanoneedles over CX using hydrothermal method. The used characterization techniques are XRD, HRTEM, FESEM and surface area measurements. The physicochemical properties of NiCo2O4/CX show face centered cubic nanoneedles-like structures containing different lengths and widths. In addition, BET analysis clarify that NiCo2O4/CX nanocomposite is mesoporous with uniform cylindrical pore geometry with two modular systems compared to narrow necks ink-bottle pore geometry for pristine NiCo2O4. Electrocatalytic activity and stability of glassy carbon modified electrode with NiCo2O4/CX towards methanol electro-oxidation in basic medium are studied using cyclic voltammetry and chronoamperometry techniques. Data shows, the NiCo2O4/CX modified electrode gives a catalytic current density of 98 mA cm(-2) at 0.29 V with a good stability of 90.6% current retention after 100 repetitive cycles compared to 37.8 mA cm(-2) at 0.38 V for pristine NiCo2O4. The highly electrocatalytic activity of NiCo2O4/CX modified electrode is correlated to the synergistic effects between the pore geometry and accessible porosity. (c) 2017 Elsevier Ltd. All rights reserved.
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