Fabrication of PANI-coated honeycomb-like MnO2 nanospheres with enhanced electrochemical performance for energy storage

Sun, Xiaowu; Gan, Mengyu; Ma, Li; Wang, Huihui; Zhou, Tao; Wang, Shiyong; Dai, Wenqin; Wang, Huining

doi:10.1016/j.electacta.2015.09.056

Cited by 56 publications

(7 citation statements)

References 44 publications

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“…19 Therefore, numerous approaches are undertaken to improve the specic capacitance of MnO 2 as an electrode, such as forming a composite electrode with conductive substrates, 20,21 making atomic defects 22,23 and modications. 24,25 Besides, among the various methods of synthesizing MnO 2 , electrochemical deposition is considered to be the simplest and relatively rapid preparation method. Moreover, it is suitable for preparing nanomaterials and MnO 2 with nanostructures greatly shortens the diffusion path of the electrolyte ions during the process of charging and discharging, which can effectively improve the specic capacitance of supercapacitors.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

Effects of electrodeposition time on a manganese dioxide supercapacitor

Dai

Zhang

et al. 2020

RSC Adv.

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“…[15,[22][23][24][25][26][27][28] Gold-, platinum-, stainless steel-, carbon-based electrodes and indium-doped tin oxide (ITO)-coated glasses have been employed as substrates for the deposition of PANI electrochemically [29][30][31][32][33] for specified application. [45] PANI/MnO 2 nanocomposites were prepared by single-step pulse voltammetry showing maximum specific capacitance of 148 F/g. Furthermost of the electrochemical synthesis of PANI and its composites, for supercapacitor fabrication, requires a binder or template.…”

Section: Introductionmentioning

confidence: 99%

“…Chemically synthesized MnO 2 /PANI composite was reported to have 510 F/g specific capacitance on nickel foam substrate with PTFE binder . Honeycomb‐like MnO 2 /PANI composite coated on carbon paper with Teflon was reported to exhibit 565 F/g specific capacitance . PANI/MnO 2 nanocomposites were prepared by single‐step pulse voltammetry showing maximum specific capacitance of 148 F/g .…”

Section: Introductionmentioning

confidence: 99%

Electrochemical co‐deposition and characterization of polyaniline and manganese oxide nanofibrous composites for energy storage properties

et al. 2017

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Ion diffusion rate and contact surface area of conducting polymers increased by composite formation with nanometric-size materials make them promising materials in the fabrication of energy storage devices. In this work, electronically conducting polyaniline and manganese oxide (PANI/MnO 2 ) nanofibrous composites were electrochemically co-deposited on stainless steel from binder-free electrolyte solution. Structural characterization and morphological characterization of the materials were performed with Fourier-transformed infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). SEM images show fibrous micro/nano-architecture of the composites with cluster networking structure having 200-500 nm length and 100-200 nm diameter. Electrochemical and energy storage properties of the assynthesized materials were investigated with cyclic voltammetry (CV), galvanostatic charge discharge curves(GCDC), and potentiostatic electrochemical impedance spectroscopy (PEIS) without any binders. Electrochemical measurements as well as galvanostatic charge discharge curves at 1 mA constant current have shown maximum specific capacitance of 149 F/g for the composite prepared with 0.15 M MnSO 4 in the co-deposition bath. The composites retain 67% specific capacitance even after 400 cycles, indicating the stability of synthesized composite. PEIS confirms the pseudocapacitive nature of the synthesized composites. K E Y W O R D S conducting polymers, energy storage, impedance spectroscopy, PANI/MnO x composites How to cite this article: Shah A-u-HA, Khan MO, Bilal S, Rahman G, Hung HV. Electrochemical co-deposition and characterization of polyaniline and manganese oxide nanofibrous composites for energy storage properties.

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“…The coating of conducting polymer is recognized as an effective way to restrain this dissolution process. 23 –25 Moreover, the conducting polymer possesses higher electrical conductivity and pesudocapacitance, which results from rapid doping/dedoping in acidic solution. Thus, the synergy of MnO 2 and conducting polymer allows superior electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

“…24 Sun et al fabricated a new PANI-protected MnO 2 nanocomposite, in which the honeycomb-like MnO 2 core was coated by PANI layer. 25 To date, the protection of MnO 2 in acidic media is still a huge challenge.…”

Section: Introductionmentioning

confidence: 99%

Facile fabrication of MnO₂-embedded 3-D porous polyaniline composite hydrogel for supercapacitor electrode with high loading

Huang

Chen

Yang

et al. 2019

High Performance Polymers

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To obtain the promising pseudocapacitance of MnO2, the composite hydrogel of MnO2 and polyaniline (PANI) was fabricated using in situ polymerization of aniline hydrochloride in the aqueous solution containing commercial MnO2 nanoparticles and additives. Both scanning electron microscopy and transmission electron microscopy results indicated that the composite hydrogel exhibited a 3-D porous structure, within which MnO2 nanoparticles were uniformly embedded. The investigations of cyclic voltammetry, galvanostatic charge−discharge, and electrochemical impedance spectroscopy demonstrated superior supercapacitor (SC) performance of the hydrogel electrode even with high loading. The electrode with loading of 1.5 mg cm–2 showed a favorable specific capacitance (293 F g–1, 10 mV s–1), which only decreased to 258 F g–1 when the loading of the electrode was seven times higher (10.8 mg cm–2). Furthermore, the hydrogel electrode displayed good cycle stability in the acidic solution (81% capacitance retention after 1000 charge/discharge cycles). The favorable electrochemical performance of the composite hydrogel should be attributed to the fast electron/ion transport and good protection for MnO2 in the 3-D porous structure. Due to the facile one-pot synthesis and optimized nanostructure, it could be expected that MnO2-embedded 3-D porous PANI composite hydrogels have great application in the field of high-performance electrode with high loading for SCs.

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Fabrication of PANI-coated honeycomb-like MnO2 nanospheres with enhanced electrochemical performance for energy storage

Cited by 56 publications

References 44 publications

Effects of electrodeposition time on a manganese dioxide supercapacitor

Effects of electrodeposition time on a manganese dioxide supercapacitor

Electrochemical co‐deposition and characterization of polyaniline and manganese oxide nanofibrous composites for energy storage properties

Facile fabrication of MnO₂-embedded 3-D porous polyaniline composite hydrogel for supercapacitor electrode with high loading

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Fabrication of PANI-coated honeycomb-like MnO2 nanospheres with enhanced electrochemical performance for energy storage

Cited by 56 publications

References 44 publications

Effects of electrodeposition time on a manganese dioxide supercapacitor

Effects of electrodeposition time on a manganese dioxide supercapacitor

Electrochemical co‐deposition and characterization of polyaniline and manganese oxide nanofibrous composites for energy storage properties

Facile fabrication of MnO2-embedded 3-D porous polyaniline composite hydrogel for supercapacitor electrode with high loading

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Facile fabrication of MnO₂-embedded 3-D porous polyaniline composite hydrogel for supercapacitor electrode with high loading