Mesoporous TiO2 and Co-doped TiO2 Nanotubes/Reduced Graphene Oxide Composites as Electrodes for Supercapacitors

Xiao, Hong; Guo, Wenbin; Sun, Bin; Pei, Meishan; Zhou, Guowei

doi:10.1016/j.electacta.2016.01.040

Cited by 85 publications

(30 citation statements)

References 57 publications

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“…The fabricated electrode has a low charge-transfer resistance (R ct ) according to the semicircle arc in the high frequency region. This is due to the faradaic reactions of Co-Mo-O, as stated by Ujjain et al, Xiao et al, and Zequine et al 16,32,49 Thus, R ct conrms the enhanced pseudo-capacitance of the electrode. It can be further observed in the plot of Fig.…”

Section: Supercapacitive Studiesmentioning

confidence: 86%

“…The potentials of the redox peaks were shied accordingly in more positive and negative directions with increasing scan rate, creating a wider potential difference (E c À E a ) at higher potential, under quasi-reversible kinetics. 32,34,49,53 This is possibly attributed to the limited ion diffusion rate during the faradaic reactions to satisfy electronic neutralization at higher scan rates. 13,14,32 This behaviour of the electrode is associated with a typical battery-type electrode.…”

Section: Supercapacitive Studiesmentioning

confidence: 99%

“…The internal resistance of the CoMoO 4 electrodes is smaller than numerous fabricated metal oxide-based electrodes. [8][9][10]16,32,49 Moreover, Miroshnikov et al 79 and Fang et al 76 demonstrated outstanding capacitive behaviour by EIS analysis of organic compounds and biomass-carbon based electrodes, respectively, due to the C, H, N, and O atoms of the electrode material. Therefore, in the current study, the low internal resistance was strongly attributed to the fact that the pathways for electron transport were not only provided by Mo and Co, but also the organic stabilizing agents (C 4 H 8 O and C 8 H 19 N) of CoMoO 4 as indicated by XPS ( Fig.…”

Section: Supercapacitive Studiesmentioning

confidence: 99%

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Organic template-assisted green synthesis of CoMoO₄ nanomaterials for the investigation of energy storage properties

et al. 2020

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Section: Supercapacitive Studiesmentioning

confidence: 86%

Section: Supercapacitive Studiesmentioning

confidence: 99%

Section: Supercapacitive Studiesmentioning

confidence: 99%

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Organic template-assisted green synthesis of CoMoO₄ nanomaterials for the investigation of energy storage properties

et al. 2020

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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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“…The specific capacitance was calculated from GCD curves at different current densities and CV graphs at different scan rates by using Equations (1) and (2), respectively. [67] C ¼ IDt mDV ð1Þ…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

One‐Pot Synthesis of Sulfur and Nitrogen Co‐Functionalized Graphene Material using Deep Eutectic Solvents for Supercapacitors

et al. 2019

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A green approach to the synthesis of sulfur and nitrogen co‐functionalized reduced graphene oxide (SN‐rGO) is presented; it involves the reduction of graphene oxide (GO) using a deep eutectic solvent (DES) as chemical reducing agent and dopant. For the first time, a DES of choline chloride and sodium sulfide comprising cheap and safe components is introduced, and is both highly effective and reusable as a reducing agent for the production of SN‐rGO. The DES is utilized as a solvent as well as reducing agent and dopant to generate SN‐rGO. This DES is highly efficient in removing oxygen functionalities from GO and for subsequent sulfur and nitrogen functionalization for high energy‐storage efficiency. The reduction ability of this DES is confirmed with five consecutive cycles, which adds to its sustainability and recyclability in the development of energy‐storage devices. SN‐rGO exhibits a high specific capacitance of 509 F g−1 at 1 A g−1, which corresponds to high energy and power densities of 57.3 Wh kg−1 and 1804.7 W kg−1, respectively. This simple and green method for direct reduction of GO with sulfur and nitrogen functionalization on the graphene surface can provide cost‐effective bulk production of a nanocarbon template for energy storage applications.

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Mesoporous TiO2 and Co-doped TiO2 Nanotubes/Reduced Graphene Oxide Composites as Electrodes for Supercapacitors

Cited by 85 publications

References 57 publications

Organic template-assisted green synthesis of CoMoO₄ nanomaterials for the investigation of energy storage properties

Organic template-assisted green synthesis of CoMoO₄ nanomaterials for the investigation of energy storage properties

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

One‐Pot Synthesis of Sulfur and Nitrogen Co‐Functionalized Graphene Material using Deep Eutectic Solvents for Supercapacitors

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Mesoporous TiO2 and Co-doped TiO2 Nanotubes/Reduced Graphene Oxide Composites as Electrodes for Supercapacitors

Cited by 85 publications

References 57 publications

Organic template-assisted green synthesis of CoMoO4 nanomaterials for the investigation of energy storage properties

Organic template-assisted green synthesis of CoMoO4 nanomaterials for the investigation of energy storage properties

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

One‐Pot Synthesis of Sulfur and Nitrogen Co‐Functionalized Graphene Material using Deep Eutectic Solvents for Supercapacitors

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Organic template-assisted green synthesis of CoMoO₄ nanomaterials for the investigation of energy storage properties

Organic template-assisted green synthesis of CoMoO₄ nanomaterials for the investigation of energy storage properties