Controlled synthesis of hierarchical birnessite-type MnO 2 nanoflowers for supercapacitor applications

Zhao, Shuoqing; Liu, Tianmo; Hou, Dewen; Zeng, Wen; Miao, Bin; Hussain, Shahid; Peng, Xianghe; Javed, Muhammad Sufyan

doi:10.1016/j.apsusc.2015.08.037

Cited by 119 publications

(42 citation statements)

References 31 publications

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“…R s is reected by the intercept on the real axis in Fig. 6(b), 42,43 including inherent resistance, ionic resistance and contact resistance of the active material to the current collector interface. The R s of 30 s, 50 s, 150 s, 300 s and 500 s are 1.71, 1.81, 1.82, 1.80, and 1.86 U, respectively.…”

Section: Electrochemical Performancementioning

confidence: 99%

Effects of electrodeposition time on a manganese dioxide supercapacitor

Dai

Zhang

et al. 2020

RSC Adv.

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As is well known that the specific capacitance of supercapacitors cannot be improved by increasing the mass of the deposited MnO 2 films, which means an appropriate deposition duration is important. In this study, nanobelt-structured MnO 2 films were prepared by the electrochemical deposition method under different deposition time to explore the effects of electrodeposition time change on the microstructure and electrochemical properties of this material. Benefiting from the microstructure of the MnO 2 films, the transfer properties of the charged electrons and ions were promoted. Meanwhile, a 3D porous nickel foam was chosen as the deposition substrate, which rendered an enhancement of the MnO 2 conductivity and the mass of the active material. The enhanced specific capacitance and specific surface area attributed to synergistic reactions. Subsequently, the electrochemical performances of the asprepared materials were analyzed via cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) tests. Results show that the optimum sample deposited for 50 s has a specific capacitance of 291.9 F g À1 at the current density of 1 A g À1 and lowest R ct . However, its electrochemical stability cannot come up to the level of the 300 s sample due to the microstructure change.

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Section: Electrochemical Performancementioning

confidence: 99%

Effects of electrodeposition time on a manganese dioxide supercapacitor

Dai

Zhang

et al. 2020

RSC Adv.

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“…It shows that the grain size is smaller than the previous study which uses longer time for reaction indicating the crystal growth controlled by the MHT process. Although more rapid growth kinetics has been achieved due to the use of microwave, no impurity was detected which is comparable to the conventional hydrothermal . Furthermore, it shows that no peak shift for samples obtained at different temperatures (Figure A) and ramp rates (Figure B).…”

Section: Resultsmentioning

confidence: 82%

“…For use as an electrode material, nanostructured MnO 2 are often used. MnO 2 nanoparticles have been synthesized with various techniques such as chemical deposition, electrodeposition, sol‐gel, sonochemistry, and conventional hydrothermal methods . Laurence Athoue et al obtained δ‐MnO 2 particles using a sol‐gel method .…”

Section: Introductionmentioning

confidence: 99%

MnO₂ with controlled phase for use in supercapacitors

Sari

Ting

2017

J Am Ceram Soc

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Nanostructured MnO 2 has been synthesized using a simple and rapid microwaveassisted hydrothermal (MHT) technique through the decomposition of KMnO 4 in a hydrochloric acid solution. The effects of hydrothermal temperature and ramp rate were examined and discussed. It was found that a lower temperature (140°C) favors the formation of cauliflower-like d-MnO 2 particles while a higher temperature (160°C, 180°C, or 200°C) favors the formation of a-MnO 2 nanorods. The dimensions of the obtained MnO 2 nanorods were affected by the ramp rate. The cauliflower-like d-MnO 2 particles have higher specific surface areas than the a-MnO 2 nanorods. Supercapacitors having the obtained MnO 2 as the electrodes were evaluated using cyclic voltammetry and electrochemical impedance spectroscopy in a 1 molÁL À1 Na 2 SO 4 solution within a potential window of À0.1-0.9 V. The cauliflower-like d-MnO 2 electrodes give higher capacitance, up to 202 F/g, than the nanorods a-MnO 2 electrodes, at most 61 F/g.

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“…At present, the main MnO 2 preparation methods are the hydrothermal/solvent thermal method, the redox method, the sol–gel method, the microwave‐assisted method, and the electrodeposition method. Nanocrystalline nanowires, nanotubes, nanosafhe, core–shell structures, and hollow polyhedrons can be prepared by conventional synthetic methods. For example, Ming et al reported the rapid synthesis of bismuth‐type MnO 2 nanospheres by microwave assisted heat at 75 °C for 30 min.…”

Section: Mno2 Storage Mechanism and Crystal Structurementioning

confidence: 99%

Research Progress in MnO₂–Carbon Based Supercapacitor Electrode Materials

Zhang

Miao

et al. 2018

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With the serious impact of fossil fuels on the environment and the rapid development of the global economy, the development of clean and usable energy storage devices has become one of the most important themes of sustainable development in the world today. Supercapacitors are a new type of green energy storage device, with high power density, long cycle life, wide temperature range, and both economic and environmental advantages. In many industries, they have enormous application prospects. Electrode materials are an important factor affecting the performance of supercapacitors. MnO -based materials are widely investigated for supercapacitors because of their high theoretical capacitance, good chemical stability, low cost, and environmental friendliness. To achieve high specific capacitance and high rate capability, the current best solution is to use MnO and carbon composite materials. Herein, MnO -carbon composite as supercapacitor electrode materials is reviewed including the synthesis method and research status in recent years. Finally, the challenges and future development directions of an MnO -carbon based supercapacitor are summarized.

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Controlled synthesis of hierarchical birnessite-type MnO 2 nanoflowers for supercapacitor applications

Cited by 119 publications

References 31 publications

Effects of electrodeposition time on a manganese dioxide supercapacitor

Effects of electrodeposition time on a manganese dioxide supercapacitor

MnO₂ with controlled phase for use in supercapacitors

Research Progress in MnO₂–Carbon Based Supercapacitor Electrode Materials

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Controlled synthesis of hierarchical birnessite-type MnO 2 nanoflowers for supercapacitor applications

Cited by 119 publications

References 31 publications

Effects of electrodeposition time on a manganese dioxide supercapacitor

Effects of electrodeposition time on a manganese dioxide supercapacitor

MnO2 with controlled phase for use in supercapacitors

Research Progress in MnO2–Carbon Based Supercapacitor Electrode Materials

Contact Info

Product

Resources

About

MnO₂ with controlled phase for use in supercapacitors

Research Progress in MnO₂–Carbon Based Supercapacitor Electrode Materials