Enhancement effect of Na ions on capacitive behavior of amorphous MnO2

Ye, Qinglan; Dong, Ruiting; Xia, Zi‐Hao; Chen, Guoren; Wang, Haili; Tan, Guoqiang; Jiang, Li; Wang, Fan

doi:10.1016/j.electacta.2014.07.076

Cited by 43 publications

(45 citation statements)

References 34 publications

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“…It has been verified that the oxygen vacancies can vary significantly with the doping of different metal elements such as earth metals, [ 107–109 ] rare earths, [ 110–116 ] transition metal, [ 67,117–133 ] or even noble metal. [ 134–139 ] From all the aforementioned classes of metals, the dopants with comparable ionic size and highly soluble feature offers a vast variety of doping element options in MOs.…”

Section: Heterogeneous Ion Doping Strategymentioning

confidence: 99%

“…In recent years, atomic doping with some specific lower valence state impurity was also demonstrated to be capable of introducing oxygen vacancies into MOs. A series of oxygen‐defective MOs, including Na + , [ 107,108 ] Zn 2+ , [ 144,145 ] Al 3+ , [ 146,147 ] Fe 3+[ 118,120,145,148 ] doped MnO 2 ; Ni 2+ doped CeO 2 ; [ 149 ] Pd 2+ doped Co 3 O 4 , [ 150 ] and so on, have been reported.…”

Section: Heterogeneous Ion Doping Strategymentioning

confidence: 99%

See 1 more Smart Citation

Oxygen Defects in Promoting the Electrochemical Performance of Metal Oxides for Supercapacitors: Recent Advances and Challenges

et al. 2020

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and considered as indispensable energy storage devices because of their higher power density and greater life expectancy compared with their competitive counterparts such as batteries, fuel cells, and conventional capacitors. Significantly, owing to their distinct advantages including the simple and safe configuration, quick charge/discharge response, large power output, and long operating life (>100 000 cycles), SCs show a promising prospect in next-generation energy technologies, like smart and wearable electronics, quick charging cellphones, regenerative braking electric motors, and instant management of industrial power and energy. [20][21][22][23][24] Currently, there are three main categories of active materials employed to advance the electrochemical performance of SCs: i) carbonaceous matrix, ii) conducting polymers, and iii) metal oxides (MOs). With respect to the former two types, MOs, especially transition MOs, usually delivers a much higher specific capacitance, as their unique crystal structure, combined with the multiple oxidation states of metal ions, are both in favor of excellent charge storage capability. Sometimes, SCs assembled with MOs are also called pseudocapacitors (PCs), because different from carbon-based electrical double layer capacitors (EDLCs), they realize the charge storage via fast Faradaic redox and/or metal ion intercalation reactions. In this way, they could deliver substantially superior specific capacitances as high as 300-1200 F g −1 and offer 10-100 times larger energy density than that of EDLCs. [25][26][27][28][29] In recent years, various MO materials have been proposed as high-performance SCs electrodes, some of which the theoretical capacitances and common operating potential windows are summarized in Figure 1a,b. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Nevertheless, further practical applications of these SCs are severely hindered by the poor electrical conductivity and frustrating structural stability of semiconductive MOs. To address these issues, owing to the rapid advancement of nanotechnology, a series of nano-and meso-scale morphological engineering strategies have been proposed to boost the electrochemical performance of MOs, either by enlarging the electrochemical active surface area or by shortening the diffusion length of electrons/ions. [30][31][32] For instance, combining MOs with some other highly conductive substances such as carbonaceous materials and metals is validated to be a feasible Metal oxides (MOs) with multiple active sites are regarded as one of the most potential active materials for high-performance supercapacitor (SC) constructions. Engineering oxygen vacancies into MOs can effectively modulate their electronic properties, subtly induce impurity states in their bandgaps, and considerably optimize their electrical conductivity. Benefiting from these advantageous properties, the resultant oxygen-defective electrodes generally embed more electrochemical active sites and present better charge storage capability in co...

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Section: Heterogeneous Ion Doping Strategymentioning

confidence: 99%

Section: Heterogeneous Ion Doping Strategymentioning

confidence: 99%

Oxygen Defects in Promoting the Electrochemical Performance of Metal Oxides for Supercapacitors: Recent Advances and Challenges

et al. 2020

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“…As a result, 2 at% Fe:MnO 2 reached a maximum specific capacitance of 273 F g −1 at 5 mV s −1 , retaining 92% after 1000 cycles. Furthermore, Ye et al used hydrothermal reduction to synthesize Na + ‐intercalated amorphous MnO 2 as an electrode material, which showed a specific capacitance of 295 F g −1 at 1 A g −1 .…”

Section: Amorphous Tmosmentioning

confidence: 99%

Recent Progress in Some Amorphous Materials for Supercapacitors

Zheng

et al. 2018

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A breakthrough in technologies having "green" and sustainable energy storage conversion is urgent, and supercapacitors play a crucial role in this area of research. Owing to their unique porous structure, amorphous materials are considered one of the best active materials for high-performance supercapacitors due to their high specific capacity, excellent cycling stability, and fast charging rate. This Review summarizes the synthesis of amorphous materials (transition metal oxides, carbon-based materials, transition metal sulfides, phosphates, hydroxides, and their complexes) to highlight their electrochemical performance in supercapacitors.

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“…The calculated specific capacitance values related to contribution of manganese oxide Cs,MnO2 were in the range 274-310 F g -1 , whereas for the PEDOT component they were close to 70-75 F g -1 . 24It is known that in a relatively broad potential range (0.0-0.8 V) (e.g. in aqueous LiClO4 solution from about 0.0 V to 0.8 V vs the NaCl saturated calomel electrode (SSCE)), [26][27][28][29][30], whereas the reduction of PEDOT is accompanied by anion flux with expulsion of an anion [31]. Therefore it can be supposed that EQCM measurements could reveal interesting features in mass transport in these composites at redox cycling.…”

Section: Introductionmentioning

confidence: 99%

“…EQCM has been earlier employed for the study of stoichiometry of mechanism of charge storage in PEDOT and MnO2 solely, and the contributions of different components of electrolytes into total mass change of PEDOT [31][32][33][34][35][36][37] and MnO2 [26][27][28][29][30] films were established.…”

Section: Introductionmentioning

confidence: 99%

EQCM study of redox properties of PEDOT/MnO2 composite films in aqueous electrolytes

Nizhegorodova

Eliseeva

Tolstopyatova

et al. 2018

J Solid State Electrochem

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Electrochemical behavior of poly-3,4-ethylenedioxythiophene composites with manganese dioxide (PEDOT/MnO2) has been investigated by cyclic voltammetry and electrochemical quartz crystal microbalance at various component ratios and in different electrolyte solutions. The electrochemical formation of PEDOT film on the electrode surface and PEDOT/MnO2 composite film during the electrochemical deposition of manganese dioxide into the polymer matrix was gravimetrically monitored. The mass of manganese oxide deposited into PEDOT at different time of electrodeposition and apparent molar mass values of species, involved into mass transfer during cyclic voltammetry of PEDOT/MnO2 composites were evaluated. It was found that during the redox cycling of PEDOT/MnO2 composite films with various MnO2 content the oppositely directed fluxes of counter ions (anions and cations) occur, resulting in a change of the slope of linear parts of the Δf-E plots with changing the mass fraction of MnO2 in the composite film. Rectangular shape of cyclic voltammograms of PEDOT/MnO2 composites with different loadings of manganese dioxide was observed, which is characteristic of the pseudo-capacitive behavior of the composite material. Specific capacity values of PEDOT/MnO2 composites obtained from cyclic voltammograms were found of about 169 F g-1. The specific capacity, related to the contribution of manganese oxide component, was about 240 F g-1 .

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Enhancement effect of Na ions on capacitive behavior of amorphous MnO2

Cited by 43 publications

References 34 publications

Oxygen Defects in Promoting the Electrochemical Performance of Metal Oxides for Supercapacitors: Recent Advances and Challenges

Oxygen Defects in Promoting the Electrochemical Performance of Metal Oxides for Supercapacitors: Recent Advances and Challenges

Recent Progress in Some Amorphous Materials for Supercapacitors

EQCM study of redox properties of PEDOT/MnO2 composite films in aqueous electrolytes

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