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

被引：224

作者：

Cheng, Shuang ^{[1
,4
]}

Yang, Lufeng ^{[1
]}

Chen, Dongchang ^{[2
]}

Ji, Xu ^{[3
]}

Jiang, Zhong-jie ^{[1
]}

Ding, Dong ^{[2
]}

Liu, Meilin ^{[1
,2
]}

机构：

[1] S China Univ Technol, Guangzhou Higher Educ Mega Ctr, Sch Environm & Energy, New Energy Res Inst, Guangzhou 510006, Guangdong, Peoples R China

[2] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA

[3] Sun Yat Sen Univ, Sch Phys & Engn, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China

[4] S China Univ Technol, Coll Environm & Energy, Guangzhou 510006, Guangdong, Peoples R China

来源：

NANO ENERGY | 2014年 / 9卷

关键词：

Pseudo-capacitors; Alpha MnO2; In operando Raman; Energy storage behavior; HIGH-PERFORMANCE SUPERCAPACITOR; MANGANESE-DIOXIDE ELECTRODE; BACTERIAL-CELLULOSE; ASYMMETRIC SUPERCAPACITOR; ENERGY-STORAGE; THIN-FILM; MNO2; NANOFIBERS; GAMMA-MNO2;

D O I：

10.1016/j.nanoen.2014.07.008

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In operando Raman spectroscopy has been used to monitor the phase changes of non-stoichiometric alpha-MnO2, alpha-Mn0.98O2, electrode materials in a pseudo-capacitor during the charging/discharging process. Results indicate that the alpha-Mn0.98O2 can be converted to MnO2 and Mn3O4 when placed in electrolyte exposed to laser for the Raman measurements. Both the phases contribute to the energy storage process through reversible phase transformation which involves hydrated cations M+, protons H+ and Mn2+ intercalation/deintercalation during the charging/discharging process. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：161 / 167

页数：7