Multi-functional reactively-sputtered copper oxide electrodes for supercapacitor and electro-catalyst in direct methanol fuel cell applications

Scientific Reports
Sambhaji M PawarHyunsik Im

Abstract

This work reports on the concurrent electrochemical energy storage and conversion characteristics of granular copper oxide electrode films prepared using reactive radio-frequency magnetron sputtering at room temperature under different oxygen environments. The obtained films are characterized in terms of their structural, morphological, and compositional properties. X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscope studies reveal that granular, single-phase Cu2O and CuO can be obtained by controlling the oxygen flow rate. The electrochemical energy storage properties of the films are investigated by carrying out cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy tests. The electrochemical analysis reveals that the Cu2O and CuO electrodes have high specific capacitances of 215 and 272 F/g in 6 M KOH solution with a capacity retention of about 80% and 85% after 3000 cycles, respectively. Cyclic voltammetry and chronoamperometry are used to study the electrochemical energy conversion properties of the films via methanol electro-oxidation. The results show that the Cu2O and CuO electrodes are electro-catalytically active and highly stable.

Citations

Dec 24, 2017·Nanoscale Research Letters·Stefanos ChaitoglouEnric Bertran
Mar 7, 2020·Scientific Reports·Gina AmbrosioStefania Pagliara
May 24, 2018·Scientific Reports·Mohamed RamadanNageh K Allam
Apr 26, 2020·Journal of Hazardous Materials·Junwen QiJiansheng Li
Oct 3, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Zhengxin LiLars Gundlach
Oct 10, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Roshan NazirSardar Ali
May 28, 2020·ACS Applied Materials & Interfaces·Sengeni AnantharajSuguru Noda

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