A sandwich structure of graphene and nickel oxide with excellent supercapacitive performance

Lv, Wei; Sun, Feng; Tang, Dai‐Ming; Fang, Hai‐Tao; Liu, Chang; Yang, Quan‐Hong; Cheng, Hui‐Ming

doi:10.1039/c1jm10400d

Cited by 132 publications

(68 citation statements)

References 26 publications

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“…Furthermore, it is found that with the increase in the amount of RGO in the photoanode, the FF of the DSSCs with RGO decreases. The decreasing in the FF may be resulted from the breaking of the TiO 2 nanofilm structures during the thermal reduction process of GO [26,46]. The combined factors discussed above lead to a trade-off for the performance of the cells with different amounts RGO doped.…”

Section: Photoelectric and Electrochemical Properties Of Rgo Photoanodementioning

confidence: 96%

“…After thermal treatment in argon atmosphere, the oxygen functional groups of GO inside the photoanode were removed, and the GO was reduced to RGO [26]. And a series of RGO-TiO 2 photoanodes containing different amounts of RGO were obtained.…”

Section: Characterization Of Rgo-tio 2 Photoanodementioning

confidence: 99%

“…The dried photoanodes were put into a tube furnace with the temperature raised to 500°C at a rate of 10°C min -1 in argon atmosphere and further sintered for 3 h at that temperature. The final RGO-decorated TiO 2 photoanodes were then obtained [26] and labeled as RGO-4, RGO-6, RGO-8, RGO-12, and RGO-24, respectively.…”

Section: Preparation Of Rgo-tio 2 Photoanodementioning

confidence: 99%

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A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

et al. 2017

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The sintered TiO 2 nanofilms were immersed in the aqueous solution of graphite oxide and then were thermally reduced to reduced graphene oxide (RGO), resulting in RGO-doped TiO 2 photoanodes employed in the dye-sensitized solar cells (DSSCs). This preparation method for the reduced graphene oxide-TiO 2 (RGO-TiO 2 ) photoanode could avoid the loss of RGO during the sintering process. The presence of RGO in the photoanodes was confirmed using Raman analysis, scanning electron microscopy, transmission electron microscopy, and energy-dispersive spectrometer. The amount of RGO in photoanode was obtained by thermo-gravimetric analysis. Other techniques such as X-ray diffraction, Brunauer-Emmett-Teller, electron energy loss spectroscopy, and X-ray photoelectron spectroscopy were used to characterize the composite materials of RGO-TiO 2 . The J-V measurement of RGO-TiO 2 -based DSSCs showed that the best photoelectric conversion efficiency (g) of 6.85% is 11.7% higher than that of the pure TiO 2 (P25-TiO 2 )-based DSSCs. It was shown that RGO in the photoanode could facilitate the phase transition in TiO 2 crystals (from anatase to rutile) resulting in the mixed crystals in the photoanodes. The existence of RGO and mixed-crystal structure of TiO 2 changed the electronic transmission pathway, reduced the recombination rate of electron-hole pairs, and thus improved the g of DSSCs.

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Section: Photoelectric and Electrochemical Properties Of Rgo Photoanodementioning

confidence: 96%

Section: Characterization Of Rgo-tio 2 Photoanodementioning

confidence: 99%

Section: Preparation Of Rgo-tio 2 Photoanodementioning

confidence: 99%

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A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

et al. 2017

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“…Extensive researches have been launched into the development of graphene-based hybrids for energy storage and conversion applications. So far, a variety of hybrid materials consisting of graphene and metal oxides, such as Fe 3 O 4 /Fe 2 O 3 [25,26], Co 3 O 4 /CoO [2,[27][28][29][30], NiO [31], CuO/Cu 2 O [32,33], SnO 2 [20], and TiO 2 [34] [2]. Ruoff et al synthesized nanostructured reduced graphene oxide/Fe 2 O 3 composite as a high-performance anode material for LIBs.…”

Section: Introductionmentioning

confidence: 98%

Mesoporous cobalt monoxide nanorods grown on reduced graphene oxide nanosheets with high lithium storage performance

Zhu

Huang

Gan

et al. 2014

Electrochimica Acta

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“…These and similar studies demonstrated that graphene possesses a dual role, to disperse metal oxide or polymer at the nanoscale and to act as a highly conductive matrix for enhancing the electrical conductivity of the electrode. Recently there have been some promising studies on the graphene-NiO, and graphene-Co 3 O 4 systems [32][33][34]. In binary nickel cobaltite (NiCo 2 O 4 ), the co-existence of nickel and cobalt ions can offer a richer variety of redox reactions, resulting in enhanced electrochemical performance relative to NiO or Co 3 O 4 [35,36].…”

Section: Introductionmentioning

confidence: 99%

Graphene-nickel cobaltite nanocomposite asymmetrical supercapacitor with commercial level mass loading

et al. 2012

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A high performance asymmetric electrochemical supercapacitor with a mass loading of 10 mg·cm -2 on each planar electrode has been fabricated by using a graphene-nickel cobaltite nanocomposite (GNCC) as a positive electrode and commercial activated carbon (AC) as a negative electrode. Due to the rich number of faradaic reactions on the nickel cobaltite, the GNCC positive electrode shows significantly higher capacitance (618 F·g -1 ) than graphene-Co 3 O 4 (340 F•g -1 ) and graphene-NiO (375 F•g -1 ) nanocomposites synthesized under identical conditions. More importantly, graphene greatly enhances the conductivity of nickel cobaltite and allows the positive electrode to charge/discharge at scan rates similar to commercial AC negative electrodes. This improves both the energy density and power density of the asymmetric cell. The asymmetric cell composed of 10 mg GNCC and 30 mg AC displayed an energy density in the range of 19.5 Wh•kg -1 with an operational voltage of 1.4 V. At high sweep rate, the system is capable of delivering an energy density of 7.6 Wh•kg -1 at a power density of about 5600 W•kg -1 . Cycling results demonstrate that the capacitance of the cell increases to 116% of the original value after the first 1600 cycles due to a progressive activation of the electrode, and maintains 102% of the initial value after 10000 cycles.

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A sandwich structure of graphene and nickel oxide with excellent supercapacitive performance

Cited by 132 publications

References 26 publications

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

Mesoporous cobalt monoxide nanorods grown on reduced graphene oxide nanosheets with high lithium storage performance

Graphene-nickel cobaltite nanocomposite asymmetrical supercapacitor with commercial level mass loading

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