Effects of anodic deposition of manganese oxide on surface chemical environment and capacitive performance of graphene hydrogel

• Published in: Electrochimica acta Vol. 290; pp. 487 - 495
• Main Authors: Chi, Hong Zhong, Wu, Yong Qiang, Shen, Yu Kang, Zhang, Chunxiao, Qin, Haiying, Xiong, Qinqin, Lu, Xiaoxiao, Ji, Zhenguo
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 10.11.2018; Elsevier BV
• Subjects: Capacitance; Capacitive performance; Electrodeposition; Fourier transforms; Functional groups; Graphene; Graphene hydrogel; Hydrogels; Manganese oxide; Manganese oxides; Organic chemistry; Porosity; Voltammetry; X ray spectra; Electrodeposition; Capacitive performance; Graphene hydrogel; Manganese oxide
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2018.09.029

Anodic electrodepositing manganese oxide into a graphene hydrogel not only improves the carbon material's capacitive performance, but surface chemical environment of the GO framework is also affected. Apart from the deposition of nano-sized manganese oxide (about 6 nm), Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and cyclic voltammetry results confirm that reduction on oxygen-containing functional groups takes place during the anodic process. After the electrodeposition, weakness of the graphene hydrogel in capacitance is mitigated by the incorporation of the pseudo-capacitive material, with an almost 100% increase. And the composite electrode possesses superior rate capability, reversibility and cycling stability (only 8% deterioration in capacitance after 6000 charge/discharge cycles) as well. •Electrodepositing manganese oxide into a graphene hydrogel.•High performance graphene-based composite electrode.•Decline in contents of oxygen-containing functionalities.