The rods-like manganese dioxide films grown on nickel foam for electrochemical capacitor applications

• Published in: Russian journal of electrochemistry 2013-10, Vol.49 (10), p.975-982
• Main Authors: Kong, Ling-Bin, Bai, Rui-Juan, Lang, Jun-Wei, Luo, Yong-Chun, Kang, Long
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Electrochemistry; Physical Chemistry
• ISSN: 1023-1935; 1608-3342
• DOI: 10.1134/S1023193513030087

MnO 2 films grown on nickel foam (NF) with a desirable 3D structure are investigated as electrochemical pseudocapacitor materials for potential energy storage applications. The prepared MnO 2 films are characterized by X-ray diffraction, FT-IR and scanning electron microscopy. Results indicate that the products are typical hexagonal ɛ-MnO 2 with a uniform nanorod structure. The electrochemical measurements showed that the MnO 2 films with rods-like morphology have excellent electrochemical performances and its specific capacitance value as single electrode is up to 664 F g −1 at a discharge current density of 5.5 A g −1 , which is higher than that of most reported corresponding materials. The specific capacitance retention ratio is 76.7% at the current density range from 5.5 to 30 A g −1 . Furthermore, we found that the deposition conditions such as deposition potential and deposition mass have a pronounced effect on their electrochemical activities.