Long Cycling Life Supercapacitors Electrode Materials: Ultrathin Manganese Dioxide Nanoscrolls Adhered to Graphene by Electrostatic Self-Assembly

2015 ◽  
Vol 174 ◽  
pp. 1234-1243 ◽  
Author(s):  
Kuangmin Zhao ◽  
Suqin Liu ◽  
Yuanzhan Wu ◽  
Kezhou Lv ◽  
Hao Yuan ◽  
...  
Keyword(s):  
Manganese Dioxide ◽  
Self Assembly ◽  
Electrode Materials ◽  
Cycling Life

scholarly journals Preparation and Characterization of Self-Assembled Manganese Dioxide Thin Films

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Suh Cem Pang ◽  
Suk Fun Chin ◽  
Chian Ye Ling
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Manganese Dioxide ◽  
Self Assembly ◽  
Electrode Materials ◽  
Thin Film Deposition ◽  
Deposition Process ◽  
Film Deposition ◽  
Deposition Duration ◽  
Self Assembled

Thin films of manganese dioxide (MnO2) were prepared by self-assembly of MnO2nanoparticles directly unto nickel-coated poly(ethylene terephthalate) flexible films using the newly developed horizontal submersion process. The thickness of deposited thin films was controllable by the deposition duration. This horizontal submersion deposition process for thin-film deposition is relatively easy, simple, and cost effective. Effects of deposition duration and calcination temperatures on the microstructure and electrochemical properties of self-assembled MnO2thin films were investigated. Optimized MnO2thin films exhibited high charge capacity, good cycling reversibility, and stability in a mild aqueous electrolyte and are thus promising electrode materials for the fabrication of thin-film electrochemical capacitors.

Poly(aniline-co-pyrrole)-coated Ni-doped manganese dioxide as electrode materials for supercapacitors

2020 ◽  
Vol 13 (02) ◽  
pp. 2051007
Author(s):  
Jie Dong ◽  
Qinghao Yang ◽  
Qiuli Zhao ◽  
Zhenzhong Hou ◽  
Yue Zhou ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Manganese Dioxide ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Cycle Stability ◽  
Mass Ratio ◽  
Scan Rate ◽  
Poly Aniline ◽  
Inorganic And Organic

Electrode materials with a high specific capacitance, outstanding reversibility and excellent cycle stability are constantly pursued for supercapacitors. In this paper, we present an approach to improve the electrochemical performance by combining the advantages of both inorganic and organic. Ni-MnO2/PANi-co-PPy composites are synthesized, with the copolymer of aniline/pyrrole being coated on the surface of Ni-doped manganese dioxide nanospheres. The inorganic–organic composite enables a substantial increase in its specific capacitance and cycle stability. When the mass ratio of Ni-MnO2 to aniline and pyrrole mixed monomer is 1:5, the composite delivers high specific capacitance of 445.49[Formula: see text]F/g at a scan rate of 2[Formula: see text]mV/s and excellent cycle stability of 61.65% retention after 5000 cycles. The results indicate that the Ni-MnO2/PANi-co-PPy composites are promising electrode materials for future supercapacitors application.

scholarly journals A Hierarchical Architecture of Functionalized Polyaniline/Manganese Dioxide Composite with Stable-Enhanced Electrochemical Performance

2021 ◽  
Vol 5 (5) ◽  
pp. 129
Author(s):  
Yapeng Wang ◽  
Yanxiang Wang ◽  
Chengjuan Wang ◽  
Yongbo Wang
Keyword(s):  
Electrochemical Performance ◽  
Manganese Dioxide ◽  
Specific Capacitance ◽  
Current Density ◽  
Electrode Materials ◽  
High Efficiency ◽  
Scanning Speed ◽  
Hierarchical Architecture ◽  
Electrochemical Window ◽  
A Current

As one of the most outstanding high-efficiency and environmentally friendly energy storage devices, the supercapacitor has received extensive attention across the world. As a member of transition metal oxides widely used in electrode materials, manganese dioxide (MnO2) has a huge development potential due to its excellent theoretical capacitance value and large electrochemical window. In this paper, MnO2 was prepared at different temperatures by a liquid phase precipitation method, and polyaniline/manganese dioxide (PANI/MnO2) composite materials were further prepared in a MnO2 suspension. MnO2 and PANI/MnO2 synthesized at a temperature of 40 °C exhibit the best electrochemical performance. The specific capacitance of the sample MnO2-40 is 254.9 F/g at a scanning speed of 5 mV/s and the specific capacitance is 241.6 F/g at a current density of 1 A/g. The specific capacitance value of the sample PANI/MnO2-40 is 323.7 F/g at a scanning speed of 5 mV/s, and the specific capacitance is 291.7 F/g at a current density of 1 A/g, and both of them are higher than the specific capacitance value of MnO2. This is because the δ-MnO2 synthesized at 40 °C has a layered structure, which has a large specific surface area and can accommodate enough electrolyte ions to participate the electrochemical reaction, thus providing sufficient specific capacitance.

Self-assembly synthesis of nitrogen-doped mesoporous carbons used as high-performance electrode materials in lithium-ion batteries and supercapacitors

2017 ◽  
Vol 41 (21) ◽  
pp. 12901-12909 ◽  
Author(s):  
Chunfeng Shao ◽  
Ziqiang Wang ◽  
Errui Wang ◽  
Shujun Qiu ◽  
Hailiang Chu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Self Assembly ◽  
High Performance ◽  
Electrode Materials ◽  
Lithium Ion ◽  
Mesoporous Carbons ◽  
Nitrogen Doped ◽  
First Time ◽  
Enhanced Electrochemical Performance

Guanine was, for the first time, used as a nitrogen source during the synthesis of nitrogen-doped porous carbons (NMCs) with enhanced electrochemical performance.

The preparation and properties performance of lithium carbonate @ manganese dioxide @ white carbon black electrode materials

Ionics ◽  
2021 ◽  
Author(s):  
Xuchun Wang ◽  
Dongdong Ouyang ◽  
Qi Wang ◽  
Xuemei Zhang ◽  
Qianrui Liu ◽  
...  
Keyword(s):  
Carbon Black ◽  
Manganese Dioxide ◽  
Electrode Materials ◽  
Lithium Carbonate

scholarly journals Prepared MnO2 with different crystal forms as electrode materials for supercapacitors: experimental research from hydrothermal crystallization process to electrochemical performances

RSC Advances ◽  
2017 ◽  
Vol 7 (64) ◽  
pp. 40286-40294 ◽  
Author(s):  
Xiaoyu Zhao ◽  
Yongdan Hou ◽  
Yanfei Wang ◽  
Libin Yang ◽  
Liang Zhu ◽  
...  
Keyword(s):  
Manganese Dioxide ◽  
Hydrothermal Treatment ◽  
Experimental Research ◽  
Crystallization Process ◽  
Electrode Materials ◽  
Electrochemical Performances ◽  
Hydrothermal Crystallization ◽  
Crystal Forms ◽  
Ph Values ◽  
Time Periods

The aim of this study was to prepare manganese dioxide with different crystal forms through hydrothermal treatment of MnSO4·H2O–KMnO4 precursors at various precursor ratios, temperatures, time periods, and pH values.

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