Blocky woodceramics/nano-MnO2 prepared by one-step hydrothermal activation as supercapacitor electrode

Zhang, Chuanyan; Yu, Xianchun; Chen, Haowei; Li, Luanyu; Sun, Delin; Chen, Xinyi; Hao, Xihong

doi:10.1016/j.jallcom.2021.158685

Cited by 19 publications

(6 citation statements)

References 46 publications

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“…30 On the other hand, the heat generated by the charge and discharge makes the attenuation of the electrode material particularly obvious. 31 Compared with the first cycle, the specific capacitance degradation of AC and AC-MnO 2 -AgNW thin-film electrodes are 18%, and 12%, respectively. The AC-MnO 2 -AgNW electrodes had higher stability due to it has lower charge-transfer resistance, which prevented internal heat generation from long-term charge and discharge cycles, enabling the thin-film electrodes to have a higher capacitance retention rate.…”

Section: Resultsmentioning

confidence: 95%

Characterization of MnO2 and AgNWs Co-Doped into an Activated Carbon Thin Film Electrode for Supercapacitors

Huang

Zhang

2021

J. Electron. Mater.

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In this study, the properties of supercapacitors were improved by doping nanomaterials. Transition metal oxides (i.e., MnO 2 ) with Faraday's reduction-oxidation (redox) reaction and silver nanowires (AgNWs) with high conductivity were doped into activated carbon based material to prepare thin-film electrodes. The results indicated that doping with AgNWs can effectively improve the conductivity of the thin film electrode. A conductive network was constructed between activated carbon and MnO 2 , and the optimal balance between conductivity and specific surface area was achieved through suitable doping. Thus, the electrochemical efficacy of the developed supercapacitor was effectively improved, and its specific capacitance increased from 240.14 F/g before doping to 1020.91 F/g (by 3.25 times) after doping. In addition, the prepared thin-film electrodes had favorable reproducibility at different voltage scan rates. Electrochemical impedance spectroscopy indicated a noticeable decrease in the charge transfer resistance of the thin-film electrodes from 1.46 Ω before doping to 0.66 Ω after doping. The doping of the two nanomaterials preserved their respective advantages and created a synergistic effect. The doping of transition metal oxides with metal AgNWs has applications in thin-film preparation for different types of supercapacitors, thereby enhancing the capacitance effect.

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Section: Resultsmentioning

confidence: 95%

Characterization of MnO2 and AgNWs Co-Doped into an Activated Carbon Thin Film Electrode for Supercapacitors

Huang

Zhang

2021

J. Electron. Mater.

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“…Owing to the excellent properties of CNTs, the α-MCNTs//FCNTs-2V device retains 87.06% of its initial capacity, that is better than α-M//F-2V (49.46%) and most other devices shown in Table S3. According to Equations ( 2) and ( 3), the energy and power densities of α-MCNTs//FCNTs-2V are calculated and shown in Figure 8i and compared to other Mn-based supercapacitors in Figure 8i and Table S3 [ [49][50][51][52]. The total mass loading of α-MnO 2 on CNTs/CC is about 0.73 mg cm −2 and the discharging time at different current densities are used to calculate the energy and power densities.…”

Section: Electrochemical Performance Of α-Mno2-based Supercapacitor D...mentioning

confidence: 99%

“…Comparison of the electrochemical properties of MnO 2 -based supercapacitors. References [47,[49][50][51][52][53][54][55][56]62] are cited in the supplementary materials. Institutional Review Board Statement: Not applicable.…”

Section: Supplementary Materialsmentioning

confidence: 99%

Construction of α-MnO2 on Carbon Fibers Modified with Carbon Nanotubes for Ultrafast Flexible Supercapacitors in Ionic Liquid Electrolytes with Wide Voltage Windows

Zhu

Zhao

et al. 2022

Nanomaterials

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In this study, α-MnO2 and Fe2O3 nanomaterials are prepared on a carbon fiber modified with carbon nanotubes to produce the nonbinder core–shell positive (α-MnO2@CNTs/CC) and negative (Fe2O3@CNTs/CC) electrodes that can be operated in a wide voltage window in ultrafast asymmetrical flexible supercapacitors. MnO2 and Fe2O3 have attracted wide research interests as electrode materials in energy storage applications because of the abundant natural resources, high theoretical specific capacities, environmental friendliness, and low cost. The electrochemical performance of each electrode is assessed in 1 M Na2SO4 and the energy storage properties of the supercapacitors consisting of the two composite electrodes are determined in Na2SO4 and EMImBF4 electrolytes in the 2 V and 4 V windows. The 2 V supercapacitor can withstand a large scanning rate of 5000 mV S−1 without obvious changes in the cyclic voltammetry (CV) curves, besides showing a maximum energy density of 57.29 Wh kg−1 at a power density of 833.35 W kg−1. Furthermore, the supercapacitor retains 87.06% of the capacity after 20,000 galvanostatic charging and discharging (GCD) cycles. The 4 V flexible supercapacitor shows a discharging time of 1260 s and specific capacitance of 124.8 F g−1 at a current of 0.5 mA and retains 87.77% of the initial specific capacitance after 5000 GCD cycles. The mechanical robustness and practicality are demonstrated by physical bending and the powering of LED arrays. In addition, the contributions of the active materials to the capacitive properties and the underlying mechanisms are explored and discussed

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“…[28][29][30][31][32][33][34] Among transition metal oxides, manganese(III) oxide (Mn 2 O 3 ) has gained great interest due to various factors, such as its easy synthesis and fabrication, high stability, and good electrochemical and optical properties. [34][35][36][37][38][39] Mn oxide materials have been widely used as electroactive materials for detecting various targets (i.e., H 2 O 2 , glucose (Gl), DA, and glutathione). 35,36,38,40,41 Various morphological structures and composites of MnO 2 -based materials such as MnO 2 /F-MWCNT/Ta, 42 MnO 2 /CNT/Ta, 43 MnO 2 nanostructures/Ta, 44 MnO 2 nanosheets, 45 Au/MnO 2 /GR-CNTs, 46 ZnO@MnO 2 , 38 porous CNT/MnO 2 , 40 and Au/MnO 2 -gC 3 N 4 /TiO 2 have been used for sensing and biosensing applications including the detection of H 2 O 2 , DA, Gl, and lactose.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical engineering of Mn₂O₃/carbon nanostructured electrodes for sensitive screening of acetylcholine in biological samples

et al. 2022

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Blocky woodceramics/nano-MnO2 prepared by one-step hydrothermal activation as supercapacitor electrode

Cited by 19 publications

References 46 publications

Characterization of MnO2 and AgNWs Co-Doped into an Activated Carbon Thin Film Electrode for Supercapacitors

Characterization of MnO2 and AgNWs Co-Doped into an Activated Carbon Thin Film Electrode for Supercapacitors

Construction of α-MnO2 on Carbon Fibers Modified with Carbon Nanotubes for Ultrafast Flexible Supercapacitors in Ionic Liquid Electrolytes with Wide Voltage Windows

Hierarchical engineering of Mn₂O₃/carbon nanostructured electrodes for sensitive screening of acetylcholine in biological samples

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Blocky woodceramics/nano-MnO2 prepared by one-step hydrothermal activation as supercapacitor electrode

Cited by 19 publications

References 46 publications

Characterization of MnO2 and AgNWs Co-Doped into an Activated Carbon Thin Film Electrode for Supercapacitors

Characterization of MnO2 and AgNWs Co-Doped into an Activated Carbon Thin Film Electrode for Supercapacitors

Construction of α-MnO2 on Carbon Fibers Modified with Carbon Nanotubes for Ultrafast Flexible Supercapacitors in Ionic Liquid Electrolytes with Wide Voltage Windows

Hierarchical engineering of Mn2O3/carbon nanostructured electrodes for sensitive screening of acetylcholine in biological samples

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Hierarchical engineering of Mn₂O₃/carbon nanostructured electrodes for sensitive screening of acetylcholine in biological samples