Electric Field Enhanced Synthesis of Copper Hydroxide Nanostructures for Supercapacitor Application

Abstract

Electric¯eld enhanced approach has been used to synthesize di®erent copper hydroxide morphologies as high-performance supercapacitors electrode materials. Employing this e±cient, simple and low cost method, various shapes such as rod,°ower and cube with an average grain size of 30 nm to 1 m were obtained on the copper substrate. The results revealed that applied electric¯eld considerably accelerates the formation time of nanostructures from several days to close to 1 min, where some of the desired nanostructures were obtained even in 1 s. The electrochemical properties of di®erent morphologies were compared using cyclic voltammograms and charge/discharge tests and electrochemical impedance spectroscopy. The obtained results demonstrated that the two types of fabricated structures showed high maximum areal and speci¯c capacitance of 42 mF/cm 2 and 178 F/g at scan rate of 20 mVs À1 , respectively, which make them excellent and promising electrode materials for supercapacitors.

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“…Therefore, the copper hydroxides (Cu(OH) 2 ) possess excellent stability in comparison to copper oxides in alkaline media [50]. Moreover, owing to the higher stability of copper hydroxides in alkaline solutions, they can deliver better capacitance (higher power delivery) than copper oxides, according to the published literature [50][51][52]. All these reasons encouraged us to use the copper hydroxide (Cu(OH) 2 ) coating as a protection layer against corrosion on copper because of its chemical stability and good electrical conductivity in 6 M KOH rather than the unprotected copper itself.…”