Phase evolution of an alpha MnO2-based electrode for pseudo-capacitors probed by in operando Raman spectroscopy

• Published in: Nano energy Vol. 9; pp. 161 - 167
• Main Authors: Cheng, Shuang, Yang, Lufeng, Chen, Dongchang, Ji, Xu, Jiang, Zhong-jie, Ding, Dong, Liu, Meilin
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Ltd 01.10.2014; Elsevier
• Subjects: Alpha MnO2; Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Energy; Energy accumulation; Energy storage behavior; Energy. Thermal use of fuels; Exact sciences and technology; Fullerenes and related materials; In operando Raman; Infrared and raman spectra and scattering; Materials; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Physics; Pseudo-capacitors; Transport and storage of energy; Alpha MnO2; In operando Raman; Energy storage behavior; Pseudo-capacitors; Measurement; Phase change; Electrode material; Discharge charge cycle; Phase transformation; Electrolyte; Laser; Raman spectrometry; Alpha MnO; Capacitor; Raman spectrum

In operando Raman spectroscopy has been used to monitor the phase changes of non-stoichiometric α-MnO2, α-Mn0.98O2, electrode materials in a pseudo-capacitor during the charging/discharging process. Results indicate that the α-Mn0.98O2 can be converted to MnO2 and Mn3O4 when placed in electrolyte ex...