Reduced graphene oxide for Pt-free counter electrodes of dye-sensitized solar cells

Sarker, Subrata; Lee, Ki-Seong; Seo, Hyun Woo; Jin, Young-Ku; Kim, Dong-Min

doi:10.1016/j.solener.2017.09.029

Cited by 35 publications

(15 citation statements)

References 32 publications

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Section: Oxygen-doped Graphene In Dsscsmentioning

confidence: 99%

“…Highly conductive rGO exhibited a good electrocatalytic ability than GO because of its high standard heterogeneous rate of redox couple reduction and its electrochemical surface area. Recently, Sarker et al developed a high efficiency DSSC with rGO as CE synthesized by doctor‐blading a viscous rGO on FTO substrate. The DSSC‐rGO electrode exhibited similar catalytic performance as platinum‐based cell showing promising characteristics of replacing Pt.…”

Section: Dsscsmentioning

confidence: 99%

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Heteroatom-doped graphene and its application as a counter electrode in dye-sensitized solar cells

2018

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Summary The most frequently used counter electrode (CE) in dye‐sensitized solar cells (DSSCs) is platinum on fluorine‐doped tin oxide glass. This electrode has excellent electrical conductivity, chemical stability, and high electrocatalytic affinity for the reduction of triiodide. However, the high cost of metallic platinum and the poor electrochemical stability pose a major drawback in the commercial production. This has necessitated a search for a non‐precious metal and metal‐free electrocatalyst that demonstrates better catalytic activity and longer electrochemical stability for practical use in DSSCs. Graphene has been at the centre of attention due to its excellent optoelectronic properties. However, a defect‐free graphene sheet is not suitable as a CE in DSSCs, because of its neutral polarity which often restricts efficient charge transfer at the graphene/liquid interface, irrespective of the high in‐plane charge mobility. Hence, heteroatom‐doped graphene‐based CEs are being developed with the aim to balance electrical conductivity for efficient charge transfer and charge polarization for enhanced reduction activity of redox couples simultaneously. The elements commonly used in chemical doping of graphene are nitrogen, oxygen, boron, sulfur, and phosphorus. Halogens have also recently shown great promise. It has been demonstrated that edge‐selective heteroatom‐doping of graphene imparts both efficient in‐plane charge transfers and polarity, thereby enhancing electrocatalytic activity. Thus, heteroatom‐doped graphene serves as a good material to replace conventional electrodes and enhance power conversion efficiency in DSSCs. The focus is to reduce the cost of DSSCs. This review explores the performance of DSSCs, factors that influence the power conversion efficiency, and various physicochemical properties of graphene. It further outlines current progress on the synthetic approaches for chemical doping (substitutional and surface transfer doping) of graphene and graphene oxide with different heteroatoms in order to fine‐tune the electronic properties. The use of heteroatom‐doped graphene as a CE in DSSCs and how it improves the photovoltaic performance of cells is discussed.

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Section: Oxygen-doped Graphene In Dsscsmentioning

confidence: 99%

Section: Dsscsmentioning

confidence: 99%

Heteroatom-doped graphene and its application as a counter electrode in dye-sensitized solar cells

2018

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“…RGO is a single layer (~0.34 nm thick) of carbon atoms undergoing sp2 hybridization (covalent bonds with three other atoms) with a planar hexagon lattice arrangement (honeycomb lattice 2D) forming a unique structure, both mechanical and electrical properties with has high charge mobility 230,000 cm 2 /V-s, with 2,3% light absorption ability and larges surface area 2600 m 2 /g [5]. The DSSC performance study employs a platinum counter electrode, 4.09% [6]. The DSSC circuit using RGO can produce higher efficiency (3.96%) than GO material (3.38%).…”

Section: Introductionmentioning

confidence: 99%

Thin layer of nano nomposite RGO COMOS as a counter electrode on Dye Sensitized Solar Cell (DSSC)

Kawuri

Ramelan

Supriyanto

et al. 2022

J. Phys.: Conf. Ser.

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This research aims to synthesis of GO using the Hummer method and the effect of adding CoS(Cobalt Sulfide) and CoMoS(Cobalt Molybdenum Sulfide) Nano composites to RGO as a counter electrode of DSSC. RGO doped CoMoS and RGO doped CoMoS was synthesis using solvothermal method by adding nanocomposite CoS and CoMoS to GO by heating 200˚C. RGO CoMoS powder was formed into a paste by stirring and adding a polymer binder. The paste was deposited onto the FTO glass substrate by the slip casting method so that a thin sheet was obtained on the substrate and applied as a counter electrode on the DSSC. This composite will be measured and tested for the morphology of its layer using SEM and tested for electrical properties with Keithley I-V meter. The additional of CoS and CoMoS may cause the changes crystal size of RGO. RGO CoMoS has higher efficiency than GO and RGO. Thin film of RGO CoMoS can be used of counter electrode DSSC that has Voc= 0,39volt, fill factor (FF) 34,32% and η= 1,54%.

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“…Currently, reduced graphene oxide (rGO) is the most used carbon nanomaterial in supercapacitor electrodes due to its excellent thermal, electrical, and mechanical properties [ 23 ]; cycling stability; and large potential window [ 24 ]. The rGO can be obtained from GO by thermal, photothermal, chemical, or electrochemical reduction methods [ 25 ]. On the other hand, oxide and hydroxide materials such as MnO 2 , NiO, Co(OH) 2 or conducting polymers are usually employed for pseudo-capacitance, as they exhibit fast and reversible Faradaic processes between electrode materials and electrolytes [ 13 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Graphene Oxide-Polypyrrole Coating for Functional Ceramics

2020

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Ceramic substrates were metallized with a Ni-Mo-P electroless coating and further modified with a polypyrrole (PPy) coating by the electrodeposition method. The properties of the polypyrrole coating were studied with the addition of a graphene oxide (GO) nanomaterial prior to the electrodeposition and its reduction degree. Fourier Transform Infrared Spectroscopy, Field-Emission Scanning Electron Microscopy, Raman spectroscopy and cyclic voltammetry were employed to characterize the properties of the coatings. The results indicated the successful synthesis of conductive electrodes by the proposed approach. The electrodeposition of PPy and its charge storage properties are improved by chemically reduced GO. The surface capacitive contribution to the total stored charge was found to be dominant and increased 2–3 fold with the reduction of GO. The chemically reduced GO-modified PPy exhibits the highest capacitance of 660 F g−1 at 2 mV s−1, and shows a good cyclability of 94% after 500 charge/discharge cycles. The enclosed results indicate the use of an NiMoP electroless coating, and modification with a carbon nanomaterial and conducting polymer is a viable approach for achieving functional ceramics.

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Reduced graphene oxide for Pt-free counter electrodes of dye-sensitized solar cells

Cited by 35 publications

References 32 publications

Heteroatom-doped graphene and its application as a counter electrode in dye-sensitized solar cells

Heteroatom-doped graphene and its application as a counter electrode in dye-sensitized solar cells

Thin layer of nano nomposite RGO COMOS as a counter electrode on Dye Sensitized Solar Cell (DSSC)

Graphene Oxide-Polypyrrole Coating for Functional Ceramics

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