Dissolution of platinum in methoxy propionitrile containing LiI/I2

Olsen, Espen; Hägen, G.; Lindquist, Sten‐Eric

doi:10.1016/s0927-0248(00)00033-7

Cited by 429 publications

(219 citation statements)

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“…5 Furthermore, certain redox couples such as the conventionally used iodide tri-iodide are corrosive. 6 As an alternative, a solid-state DSC based on the organic hole transporting molecule (HTM), (2,2(7,7(-tetrakis-(N,N-di-pmethoxyphenylamine)9,9(-spirobifluorene) Spiro-OMeTAD was introduced in 1998. 7 Since the highest occupied molecular orbital of spiro-OMeTAD is deeper that the redox potential of iodide/tri-iodide couple, there is scope to reduce the required potential difference for driving the dye regeneration process, and in turn, achieve higher power conversion efficiencies.…”

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confidence: 99%

Pore Filling of Spiro‐OMeTAD in Solid‐State Dye‐Sensitized Solar Cells Determined Via Optical Reflectometry

Docampo

Hey

Guldin

et al. 2012

Adv Funct Materials

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Here, we present an optical probe to determine the pore-filling fraction of the hole-conductor 2,2-7,7-tetrakis-N,N-di-pmethoxyphenylamine-9,9-spirobifluorene (spiro-OMeTAD) into mesoporous photoanodes in solid-state dye-sensitized solar cells (ss-DSCs). Based on refractive index determination by the film's reflectance spectra, and using effective medium approximations, we can extract the volume fractions of the constituent materials and hence quantify pore-filling. This non-destructive method can be used with complete films and does not require detailed model assumptions.pore-filling fractions of up to 80% were estimated for optimized solid-state DSC photoanodes, which is higher than that previously estimated by indirect methods.Additionally, we have determined transport and recombination lifetimes as a function of the pore-filling fraction via photovoltage and photocurrent decay measurements. While extended electron lifetimes were observed with increasing pore-filling fractions, no trend was found in the transport kinetics. The data suggests that a pore-filling fraction of at least 60% is necessary to achieve optimized performance in ss-DSCs. This degree of pore-filling is even achieved in 5 µm thick mesoporous photoanodes. We can therefore conclude from this study that pore-filling is not a limiting factor in the fabrication of thick ss-DSCs.

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confidence: 99%

Pore Filling of Spiro‐OMeTAD in Solid‐State Dye‐Sensitized Solar Cells Determined Via Optical Reflectometry

Docampo

Hey

Guldin

et al. 2012

Adv Funct Materials

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“…Unfortunately, the disadvantages such as high cost, and low abundance greatly limit the large-scale application of Pt in DSSCs [12]. In addition, Pt can be decomposed to PtI4 in traditional I − /I3 − redox couple electrolyte system, which will decrease the long-term stability of the DSSCs [13]. Thus, the exploration of cheap but efficient CE material to replace Pt is a practical way to reduce the cost and realize the commercialization of DSSC application.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal growth of MoS2/Co3S4 composites as efficient Pt-free counter electrodes for dye-sensitized solar cells

Dong

Guo

et al. 2017

Sci. China Mater.

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MoS2/Co3S4 composite films were prepared via a facile one-step hydrothermal method, and used as efficient and low-cost Pt-free counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). Characterizations revealed that Co3S4 and MoS2 were obtained simultaneously during the facile hydrothermal process. The composites afforded a promising synergistic effect on the catalyzing of triiodide reduction. Enhanced electrocatalytic performance of the resultant composite films was confirmed through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analyses. DSSCs using MoS2/Co3S4 composite CEs outperform the devices with pristine MoS2 or Co3S4 CEs in power conversion efficiency (PCE). Furthermore, a PCE of 6.77% is obtained for the optimized devices using MoS2/Co3S4 composite CEs measured under standard 1 sun illumination (100 mW cm −2 , AM 1.5G), which is comparable to that of the devices fabricated under the same conditions with conventional thermally deposited Pt CEs (7.14%). The results demonstrate that MoS2/Co3S4 composites are promising alternatives to Pt to be applied as CEs for DSSCs.

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“…The light to current conversion efficiency in DSSCs is achieved by injection of electron from valance band of excited dye into the conduction band of the semiconductor oxide, followed by dye regeneration with the help of electrolyte and moving hole to the counter electrode shown in ( Figure 1). Extensively large amount of work has been done on dye molecule [5][6][7], semiconductor TiO 2 electrodes [8][9][10], counter electrodes [11] and electrolytes [12,13] to improve the DSSCs efficiency and stability. The design of organic dyes (i.e., geometric structures, molecular orbital energy, absorption profiles, and aggregation states of the dye) [14,15], reduction of the rate of charge recombination and the lack of electron donating moiety in the oxidized organic dye have also been proposed to have a great influence on output of DSSCs [16,17].…”

Section: Introductionmentioning

confidence: 99%