Electrocrystallization process of manganese oxide in graphene hydrogel

• Published in: Electrochimica acta Vol. 321; p. 134661
• Main Authors: Shen, Yu Kang, Lv, You Yin, Huang, Zhao Jie, Chi, Hong Zhong, Yan, Feng, Duan, Xing
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 20.10.2019; Elsevier BV
• Subjects: Capacitive performance; Crystallization; Electrocrystallization; Electrodeposition condition; Electrodes; Energy storage; Graphene; Graphene hydrogel; Hydrogels; Manganese oxide; Manganese oxides; Morphology; Nucleation; Oxidation; Capacitive performance; Electrodeposition condition; Graphene hydrogel; Manganese oxide; Electrocrystallization
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2019.134661

Electrodepositing manganese oxide in a three-dimensional graphene architecture has barely been explored, and therefore an exploratory but systematic investigation was conducted. A series of manganese oxide/graphene hydrogel electrodes were prepared by galvanostatic technique. The effects of electrodeposition condition, including current density, deposition time, Mn2+concentration and bath temperature, on the morphology and capacitive performance of the deposits were investigated. Nucleation and growth processes of the deposited manganese oxide were then deduced. An optimal capacitance of 452.5 F g−1 was got. This study could provide insight into the crystallization mechanism for electrochemical preparation of MnOx/graphene electrode for advanced energy storage/conversion devices. •Nucleation and growth processes of manganese oxide in a porous graphene monolith.•Effect of deposition conditions on electrocrystallization process.•Improved capacitive performance and flexible application.