Graphene oxide nanosheets as an effective template for the synthesis of porous TiO2 film in dye-sensitized solar cells

Wang, Ping; He, Fenglong; Wang, Jin; Yu, Huogen; Li, Zhao

doi:10.1016/j.apsusc.2015.06.102

Cited by 35 publications

(8 citation statements)

References 48 publications

(62 reference statements)

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“…Recently, Yu et al [22] used GO as a pore-forming agent for the preparation of porous TiO 2 photoanodes and fabricated DSSCs; they attributed the enhanced g of DSSCs to the more porous structure of TiO 2 photoanodes caused by the GO after 450°C calcinations in the air. Even though so far many studies involve the application of RGO for the improvement of the DSSC performance as mentioned above, the exact role of RGO and the working mechanism of RGO-based TiO 2 photoanode materials remain unclear, and further systematic investigations are highly desired for better understanding of the improvement of photovoltaic performance of RGOTiO 2 -based DSSCs.…”

Section: Introductionmentioning

confidence: 98%

“…Preparation of graphene-TiO 2 (GN-TiO 2 ) or reduced graphene oxide-TiO 2 (RGO-TiO 2 ) nanohybrid material as the photoanode in DSSCs is a new hot spot in the research of DSSCs in recent years [17][18][19][20][21][22][23][24]. It is believed that incorporation of GN could facilitate the electron transmission and suppress the charge recombination, so as to improve the performance of DSSCs due to its excellent conducting properties [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…However, normally the photoanodes of DSSCs are sintered at about 450 and/or 500°C in the air, which will get rid of organic materials completely and result in the formation of porous TiO 2 film structure [22]. During this sintering process, the introduced RGO could be burned out at such a high temperature in the air.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

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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“…Due to the sheet formation of the graphene into the titanium framework, the TiO2-GO has improved the conversion efficiency and formed a porous framework. [14], Modified hummer method has been implemented in another research by Wang and Cho [15], to decrease GO to rGO. The situation of the research is to design three layers of TiO2-rGO film which include several proportions of the graphene doped in the TiO2 for the DSSC photoelectrode as GR or rGO could be acquired by using an autoclave as a result of the decrease of GO.…”

Section: Dsscsmentioning

confidence: 99%

Oxygen free graphene/TiO2 nanocomposite synthesis technique for dye-sensitized solar cells photo-anode

AlSultan

Mustafa

Shafie

et al. 2020

IJEECS

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This article presents the techniques for the synthesis of oxygen-free graphene for doped in titanium dioxide TiO2. This work hypothesised the introduction of a new method for incorporating graphene nanoplatelets GNP in Anatase TiO2 using adhesive nanocomposite material, which has been done to enhance the conductivity of the nanocomposite. This work also argues with lamina problems in Graphene oxide, which reduce electron mobility and cause the electron pathways to be rerouted. The characteristics of the nanocomposite measure the colour difference, the photocurrent-voltage measurement (I-V measurement), Raman Spectroscopy, and Energy Dispersive Spectroscopy EDS. Simple visual observation results for various thin films show a colour shade difference due to the better dispersion of the nanocomposites. The uniform colour change with different weight ratios can also show the distribution of graphene sheets. Similarly, similar ratios to photocurrent-voltage readings were obtained by the different nanocomposite weights in I-V measurement. The Raman spectroscopy also recognises the existence of well-composed 2D energy band GNP sheets cooperated inside the TiO2. Finally, the work concludes with the reduction of the oxygen in weight ratios atomic, which lead to a better atomic level and the optimal weight ratio of GNP sheets to Titanium to increase the free mobility of electrons.

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“…Recently, graphene-based materials have drawn attention because of their huge specific surface area, extraordinary electronic transport properties and unique adsorption properties [1–3]. These materials have important applications in many fields, including physics [4], electrochemistry [5], environmental science [6] and catalysis [7]. For example, a MoS x /3D-graphene hybrid material as an electrode material enhanced the efficiency of hydrogen-producing in a fuel cell [8].…”

Section: Introductionmentioning

confidence: 99%

L-Lysine-grafted graphene oxide as an effective adsorbent for the removal of methylene blue and metal ions

Yan¹,

Li²,

Kong³

et al. 2017

Beilstein J. Nanotechnol.

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In this paper, novel L-lysine-modified graphene oxide (Lys-GO) was synthesized through amidation. The morphological and structural properties of Lys-GO were characterized using infrared spectrometry, scanning electronic microscopy and X-ray photoelectron spectroscopy. The as-prepared Lys-GO material was systematically investigated in a series of batch adsorption experiments for the removal of methylene blue (MB) and copper ions (Cu2+) from wastewater. These results showed that Lys-GO is a bifunctional adsorbent for the removal of dyes and metal ions, and excellent adsorption efficiency was obtained. The maximum adsorption capacities for MB dye and Cu2+ were 1679.1 mg/g and 186.9 mg/g at 35 °C, respectively. The kinetics of adsorption followed well the linear pseudo-second-kinetic model. The isotherm results indicated that MB adsorption can be described with the Langmuir isotherm model, while the adsorption of Cu2+ can be described with the Freundlich model. The excellent adsorption capacity indicated that the Lys-GO may be a promising adsorption material for the removal of environmental pollutants.

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Graphene oxide nanosheets as an effective template for the synthesis of porous TiO2 film in dye-sensitized solar cells

Cited by 35 publications

References 48 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

Oxygen free graphene/TiO2 nanocomposite synthesis technique for dye-sensitized solar cells photo-anode

L-Lysine-grafted graphene oxide as an effective adsorbent for the removal of methylene blue and metal ions

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