Journal
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Volume 45, Issue 2, Pages 1999-2010Publisher
WILEY
DOI: 10.1002/er.5893
Keywords
capacitive performance; Ce-doped Co3O4; hydrothermal synthesis; nanoflakes
Categories
Funding
- Higher Education Commission (HEC) of Pakistan under NRPU Research Project [6491, 6502, 6510]
- Research Institute at the King Fahd University of Petroleum & Minerals, Dhahran
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In this study, cerium was doped into Co3O4 to form Ce-doped Co3O4 nanoflakes with outstanding specific capacitance and cyclic stability, demonstrating great potential for use in energy storage devices.
In this work, cerium was doped in various concentrations ranging from 1.0 to 7.0 at. % by means of a facile hydrothermal synthesis route with an intention to improve the capacitive properties of Co3O4. X-ray powder diffraction (XRD), scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (EDX) and HRTEM were employed to study the structural characteristics, morphology, elemental constitution and d-spacing of the synthesized material. The capacitive characteristics were analyzed through cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) test and electrochemical impedance spectroscopy (EIS). Materials characterizations revealed the formation of pristine and Ce-doped Co(3)O(4)nanoflakes, and their average size was in the range of 45 to 55 nm and possessing excellent elemental purity. The CV test showed that 5.0 at. % Ce-doped Co(3)O(4)nanoflakes deliver outstanding specific capacitance, that is, 1309.6 F/g and excellent cyclic stability of 90.86% after 2000 CV cycles at a scan rate 5 mV/s. The GCD test at 1-10 A/g showed excellent rate capability, that is, 82.87% at high current density of 10 A/g. The EIS test revealed excellent electrical conductivity of the material. Experimental results suggest that Ce-doped Co(3)O(4)has an outstanding potential for use in energy storage devices.
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