scholarly journals Effects of electrodeposition time on a manganese dioxide supercapacitor

RSC Advances ◽  
2020 ◽  
Vol 10 (27) ◽  
pp. 15860-15869 ◽  
Author(s):  
Xiaoli Dai ◽  
Ming Zhang ◽  
Jitao Li ◽  
Dingyu Yang
Keyword(s):  
Manganese Dioxide ◽  
Specific Capacitance ◽  
Electrodeposition Time ◽  
Deposition Duration

As is well known that the specific capacitance of supercapacitors cannot be improved by increasing the mass of the deposited MnO2 films, which means an appropriate deposition duration is important.

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.

scholarly journals A new insight into the rechargeable mechanism of manganese dioxide based symmetric supercapacitors

RSC Advances ◽  
2017 ◽  
Vol 7 (14) ◽  
pp. 8561-8566 ◽  
Author(s):  
Hongyuan Chen ◽  
Sha Zeng ◽  
Minghai Chen ◽  
Yongyi Zhang ◽  
Qingwen Li
Keyword(s):  
Manganese Dioxide ◽  
Specific Capacitance ◽  
Active Material ◽  
Negative Electrode ◽  
Positive Electrode ◽  
Electrochemically Active ◽  
Insight Into

In symmetric supercapacitors based on MnO2, only MnO2 on the negative electrode serves as the electrochemically active material. MnO2 on the negative electrode dissolves and re-deposites on the positive electrode, thus induces a decrease in specific capacitance.

scholarly journals Correction: Effects of electrodeposition time on a manganese dioxide supercapacitor

RSC Advances ◽  
2020 ◽  
Vol 10 (31) ◽  
pp. 18036-18036
Author(s):  
Xiaoli Dai ◽  
Ming Zhang ◽  
Jitao Li ◽  
Dingyu Yang
Keyword(s):  
Manganese Dioxide ◽  
Electrodeposition Time

Correction for ‘Effects of electrodeposition time on a manganese dioxide supercapacitor’ by Xiaoli Dai et al., RSC Adv., 2020, 10, 15860–15869, DOI: 10.1039/D0RA01681K.

Electrodeposition of manganese dioxide film on activated carbon paper and its application in supercapacitors with high rate capability

RSC Advances ◽  
2014 ◽  
Vol 4 (109) ◽  
pp. 64187-64192 ◽  
Author(s):  
Yongfu Qiu ◽  
Pingru Xu ◽  
Bing Guo ◽  
Zhiyu Cheng ◽  
Hongbo Fan ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Manganese Dioxide ◽  
Specific Capacitance ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
High Rate ◽  
Carbon Paper ◽  
High Rate Capability ◽  
First Time ◽  
Dioxide Film

The composite MnO2/ACP is reported for the first time and it shows high specific capacitance and remarkable rate capability.

3D hierarchical MnO2 nanorod/welded Ag-nanowire-network composites for high-performance supercapacitor electrodes

2016 ◽  
Vol 52 (51) ◽  
pp. 7998-8001 ◽  
Author(s):  
Zhensong Qiao ◽  
Xiaopeng Yang ◽  
Shuhua Yang ◽  
Liqiang Zhang ◽  
Bingqiang Cao
Keyword(s):  
Manganese Dioxide ◽  
Specific Capacitance ◽  
High Performance ◽  
Nanowire Network ◽  
Ag Nanowire

Manganese dioxide nanorods were grown on a welded Ag nanowire-network for use as supercapacitor electrodes, showing ever-increasing specific capacitance.

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.

scholarly journals High Specific Capacitance of Polyaniline/Mesoporous Manganese Dioxide Composite Using KI-H2SO4 Electrolyte

Polymers ◽  
2015 ◽  
Vol 7 (10) ◽  
pp. 1939-1953 ◽  
Author(s):  
Zhongkai Hu ◽  
Lei Zu ◽  
Yanhua Jiang ◽  
Huiqin Lian ◽  
Yang Liu ◽  
...  
Keyword(s):  
Manganese Dioxide ◽  
Specific Capacitance ◽  
High Specific Capacitance

ELECTRODEPOSITION OF POLYPYRROLE/MnO2 NANOCOMPOSITE ON GRAPHITE FELT AS FREE-STANDING ELECTRODE FOR SUPERCAPACITORS

NANO ◽  
2013 ◽  
Vol 08 (02) ◽  
pp. 1350020 ◽  
Author(s):  
MINGPING HE ◽  
YUYING ZHENG ◽  
QIFENG DU
Keyword(s):  
Electron Microscopy ◽  
Electrochemical Performance ◽  
Manganese Dioxide ◽  
Specific Capacitance ◽  
Electrochemical Impedance ◽  
Easy Access ◽  
Cyclic Voltammogram ◽  
Free Standing ◽  
X Ray ◽  
Graphite Felt

Polypyrrole/manganese dioxide nanocomposite was deposited on graphite felt (GF) via electrodeposition to fabricate polypyrrole/manganese dioxide/graphite felt (PYMG), which can be used as novel free-standing electrode for supercapacitors. The microstructure and morphology of the as-prepared samples were characterized by Fourier transform infrared (FTIR) spectra, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Cyclic voltammogram (CV), chronopotentiometry (CP) and electrochemical impedance spectroscopy (EIS) techniques were employed to investigate the electrochemical performance of the composites. The PYMG electrode displayed specific capacitance as high as 596.3 Fg-1 at the current density of 0.5 Ag-1, which is much higher than that of polypyrrole/manganese dioxide (PPy/ MnO2 ) composite reported previously. The high specific capacitance of PYMG may be attributed to the fact that the porous GF is a good conductive matrix for the dispersion of PPy/ MnO2 composite and it can facilitate easy access of electrolytes to the electrode, which results in enhancement of the electrochemical performance of the composite. Furthermore, the PYMG composite exhibited enhanced specific capacitance compared to MnO2 /GF (MGF) and PPy/GF, which may be ascribed to the synergistic effect of PPy and MnO2 .

scholarly journals Recycled Carbon Fiber-Supported Polyaniline/Manganese Dioxide Prepared via One-Step Electrodeposition for Flexible Supercapacitor Integrated Electrodes

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1152 ◽  
Author(s):  
Xiaoning Wang ◽  
Hongli Wei ◽  
Wei Du ◽  
Xueqin Sun ◽  
Litao Kang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Manganese Dioxide ◽  
High Performance ◽  
Electrode Materials ◽  
Substrate Material ◽  
Flexible Electrode ◽  
Electrodeposition Time ◽  
One Step ◽  
Promising Application ◽  
Fiber Materials

The exploration of multifunctional electrode materials has been a hotspot for the development of high-performance supercapacitors. We have used carbon fiber plates recovered from construction waste to prepare high-quality flexible carbon fiber materials by pyrolysis of epoxy resin. The as-prepared recycled carbon fiber has a diameter of 8 μm and is the perfect substrate material for flexible electrode materials. Furthermore, polyaniline and manganese dioxide are uniformly deposited on the recycled carbon fiber by one-step electrodeposition to form an active film. The recycled carbon fiber/polyaniline/MnO2 composite shows an excellent specific capacitance of 475.1 F·g−1 and capacitance retention of 86.1% after 5000 GCD cycles at 1 A·g−1 in 1 M Na2SO4 electrolyte. The composites optimized for electrodeposition time have more electroactive sites, faster ions and electron transfer, structural stability and higher conductivity, endowing the composites promising application prospect.

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