Copper oxide nanosheets and nanowires grown by one-step linear sweep voltammetry for supercapacitor application. (October 2020)

• Record Type: Journal Article
• Authors: Singh, Balwant Kr; Shaikh, Aasiya; Dusane, Rajiv O.; Parida, Smrutiranjan
• Is Part Of: Journal of energy storage. Volume 31(2020)
• Publication Date: 2020-10
• Subjects: Copper oxide nanowire -- Linear sweep voltammetry -- supercapacitor; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2020.101631
• Languages: English
• ISSNs: 2352-152X

Abstract

Highlights: One step growth of various morphology of copper oxides nanostructures. Scan rate dependent growth kinetics of copper oxides nanostructures. A simple binder-free electrodes for supercapacitor with low contact resistance. Abstract: Copper oxides nanosheets and nanowires were directly grown on a copper sheet by a single step voltammetry process in an alkaline solution. The transition from the out-of-plane nanosheets to high aspect ratio nanowires is triggered by the change in the voltage sweep rate. The scan rate changes the growth mechanism from nucleation and coarsening at the slow scan rate for nanosheets to an oriented oxide nanowire growth at high scan rates. Polycrystalline copper oxide nanostructures contain both Cu(I) and Cu(II) oxide phases, which were characterized by the FEG-SEM, XRD, XPS, Raman, and TEM analysis. The copper oxides nanosheets and nanowires electrodes delivered the maximum specific areal capacitance 320 mF cm −2, energy density 3.36 µWh cm −2 and, power density 1.7 mW cm −2 with capacitance retention of 115% up to 5000 cycles. The process presents a simple, low cost and scalable option for the preparation of binder-free copper oxides nanowires and nanosheets electrodes for supercapacitor application. Graphical abstract: Image, graphical abstract