Electrochemical energy-storage performances of nickel oxide films prepared by a sparking method

• Main Authors: Yaowamarn Chuminjak, Suphaporn Daothong, Preeyaporn Reanpang, Johannes Philipp Mensing, Ditsayut Phokharatkul, Jaroon Jakmunee, Anurat Wisitsoraat, Adisorn Tuantranont, Pisith Singjai
• Format: Journal
• Published: 2018
• Subjects: Chemical Engineering; Chemistry
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84939133426&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/54251
• Institution: Chiang Mai University

© The Royal Society of Chemistry. In this work, nickel oxide (NiO) films have been prepared by a sparking method on flexible chromium/gold coated polyethylene terephthalate substrates and investigated for electrochemical energy-storage applications. Structural characterizations by scanning/transmission electron microscopies, X-ray diffraction, X-ray photoelectron spectroscopy and a UV-vis spectrophotometer reveal that the film comprises polycrstalline NiO nanoparticles with diameters in the range of 3.0-6.0 nm loosely agglomerated into a porous foam-like network. The nanoporous sparked NiO films, exhibit remarkable energy-storage behavior with a high average specific charge capacity of 402.75 C g-1 at a discharge current of 1 A g-1 and a good capacity retention of 88% after 1000 cycles at a high discharge current of 40 A g-1. Thus, the sparking method is a promising alternative route for the preparation of high-performance electrochemical energy-storage devices.