Open AccessCobalt-Doped Manganese Dioxide Hierarchical Nanostructures for Enhancing Pseudocapacitive Properties
Author(s) -
Smita Jadhav,
Ramchandra S. Kalubarme,
Norihiro Suzuki,
Chiaki Terashima,
Junyoung Mun,
Bharat B. Kale,
Suresh Gosavi,
Akira Fujishima
Publication year - 2021
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.0c06150
Subject(s) - manganese , materials science , supercapacitor , nanocomposite , cobalt , capacitance , chemical engineering , electrode , electrochemistry , doping , nanotechnology , optoelectronics , chemistry , metallurgy , engineering
Herein, overall improvement in the electrochemical performance of manganese dioxide is achieved through fine-tuning the microstructure of partially Co-doped manganese dioxide nanomaterial using facile hydrothermal method with precise control of preparative parameters. The structural investigation exhibits formation of a multiphase compound accompanied by controlled reflections of α-MnO 2 as well as γ-MnO 2 crystalline phases. The morphological examination manifests the presence of MnO 2 nanowires having a width of 70-80 nm and a length of several microns. The Co-doped manganese dioxide electrode displayed a particular capacitive behavior along with a rising order of capacitance concerning with increased cobalt ion concentration suitable for certain limits. The value of specific capacitance achieved by a 5% Co-doped manganese dioxide sample was 1050 F g -1 at 0.5 A g -1 , which was nearly threefold greater than that achieved by a bare manganese dioxide electrode. Furthermore, Co-doped manganese dioxide nanocomposite electrode exhibits exceptional capacitance retention (92.7%) till 10,000 cycles. It shows the good cyclability as well as stability of the material. Furthermore, we have demonstrated the solid-state supercapacitor with good energy and power density.