Fabrication of a Mo‐Doped Strontium Cobaltite Perovskite Hybrid Supercapacitor Cell with High Energy Density and Excellent Cycling Life

Tomar, Anuj Kumar; Singh, Gurmeet; Sharma, Raj Kishore

doi:10.1002/cssc.201801869

Cited by 93 publications

(42 citation statements)

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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%

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%

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

et al. 2020

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“…6 b indicates the existence of Co elemental in two oxidation of Co 2+ and Co 3+ . And the binding energies at 779.7 and 794.8 eV are attributed to Co 3+ , while the binding energies at 780.8 and 796.2 eV are ascribed to Co 2+ [ 40 , 41 ]. The high-resolution spectrum of O 1s showed in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The high-resolution spectrum of O 1s showed in Fig. 6 c exhibits four peaks at 532.4, 531.8, 529.8, and 529.5 eV after deconvolution of O 1s, corresponding to surface adsorbed H 2 O, surface adsorbed oxygen or hydroxyl groups, highly oxidative oxygen species, and surface lattice oxygen, respectively [ 24 , 41 , 42 ]. It is believed that the higher of oxygen vacancies in perovskite oxides is favorable for the adsorption capacity of OH - , thus accelerating the kinetics of surface oxidation-reduction reaction and improving the conductivity and electrochemical performance [ 24 , 43 ].…”

Section: Resultsmentioning

confidence: 99%

Enhancing the Electrochemical Properties of LaCoO3 by Sr-Doping, rGO-Compounding with Rational Design for Energy Storage Device

Zhang

Yu²,

2020

Nanoscale Res Lett

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Perovskite oxides, as a kind of functional materials, have been widely studied in recent years due to its unique physical, chemical, and electrical properties. Here, we successfully prepared perovskite-type LaCoO3 (LCOs) nanomaterials via an improved sol-gel method followed by calcination, and investigated the influence of calcination temperature and time on the morphology, structure, and electrochemical properties of LaCoO3 nanomaterials. Then, based on the optimal electrochemical performance of LCO-700-4 electrode sample, the newly synthesized nanocomposites of Sr-doping (LSCO-0.2) and rGO-compounding (rGO@LCO) through rational design exhibited a 1.45-fold and 2.03-fold enhancement in its specific capacitance (specific capacity). The rGO@LCO electrode with better electrochemical performances was further explored by assembling rGO@LCO//rGO asymmetric supercapacitor system (ASS) with aqueous electrolyte. The result showed that the ASS delivers a high energy density of 17.62 W h kg−1 and an excellent cyclic stability with 94.48% of initial capacitance after 10,000 cycles, which are good electrochemical performances among aqueous electrolytes for green and new efficient energy storage devices.

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“…The oblique triangle shape of the CCD curves in the case of both electrodes indicate their pseudocapacitive nature. [30] The extended CCD curve with less IR drop indicates higher capacitive performance and least resistivity of the CoS/ PPy NCs based electrode. The results of the CCD tests are in accordance with CV test results and both indicate the pseudocapacitive behavior of the as-prepared electrodes.…”

Section: Electrochemical Measurementsmentioning

confidence: 98%

Wafer‐Like CoS Architectures and Their Nanocomposites with Polypyrrole for Electrochemical Energy Storage Applications

et al. 2020

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In this work, we have fabricated wafer‐like CoS and their nanocomposite with Polypyrrole (PPy) via hydrothermal and ultra‐sonication techniques. The fabrication of the nanocomposite was confirmed by XRD and FT‐IR analysis. The morphology and elemental composition of the as‐prepared CoS and their nanocomposite with PPy was investigated by FESEM and EDX analysis. The synthesized CoS/PPy nanocomposite (NCs) exhibit higher gravimetric capacitance (564 Fg−1 at 1 Ag−1) and superior cycling durability with 87.6% retention after 1000 charges/discharge cycles compared to CoS wafers, thus exhibiting as a pure pseudocapacitive electrode. The superior capacitive performance of the CoS/PPy NCs is due to wafer‐like CoS and highly conductive matrix of PPy. The porous structure of the CoS provides more sites for redox reactions, while the PPy matrix facilitates the transportation of charges via their conductive channels. Hence PPy in NCs plays a double role, one as a pseudocapacitive supplement while second as a highly conductive matrix. The fabricated CoS/PPy NCs exhibits lower electrical resistivity (2.5 × 103 Ω‐cm) than that of pristine CoS NWs (3.4 × 107 Ω‐cm), due to the presence of highly conductive matrix of PPy. The improved electrical conductivity of the CoS/PPy NCs (2.5 × 103 Ω‐cm) than the wafer‐like CoS (3.4 × 107 Ω‐cm) was confirmed by I−V measurements. Moreover, the lower charge transfer resistance (Rct, 22 Ω) of the CoS/PPy NCs during the EIS test also indicates its superior redox activity. The results of electrical and electrochemical tests show that CoS/PPy NCs can be used as a potential electrode material for higher performance pseudocapacitor applications.

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Fabrication of a Mo‐Doped Strontium Cobaltite Perovskite Hybrid Supercapacitor Cell with High Energy Density and Excellent Cycling Life

Cited by 93 publications

References 50 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

Enhancing the Electrochemical Properties of LaCoO3 by Sr-Doping, rGO-Compounding with Rational Design for Energy Storage Device

Wafer‐Like CoS Architectures and Their Nanocomposites with Polypyrrole for Electrochemical Energy Storage Applications

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