Abstract
Graphene-MoS2 composites were synthesized via one-step microwave-assisted chemical bath deposition and used as counter electrodes for dye-sensitized solar cells, instead of traditional Pt film which has high cost and poor stability. The effects of graphene additive amount on the performance of cells were studied. The results reveal that sheet porous structure graphene and MoS2 particles has been incorporated tightly, which is the benefit of electrical conductivity and catalysis ability. A maximum efficiency of 6.3% has been achieved under 100 mW cm−2 illumination when the Mo:C is 1:1.
Highlights
Dye-sensitized solar cell (DSSC) has always been a research hotspot in the materials and energy field, which is mainly due to its simple preparation process, low cost, diverse colors, and flexibility (Bajpai et al, 2011)
After being combined with graphene, the agglomeration of the flake-shaped MoS2 nanoparticles is greatly reduced, and MoS2 sheets were closely attached with graphene to form a network structure
electrochemical impedance spectra (EIS) results demonstrate that the electrochemical performance of composite counter electrode is higher than pure MoS2 counter electrode, and the catalytic ability and conductivity of MSG-1:1 are comparable to Pt (Wang et al, 2011)
Summary
Dye-sensitized solar cell (DSSC) has always been a research hotspot in the materials and energy field, which is mainly due to its simple preparation process, low cost, diverse colors, and flexibility (Bajpai et al, 2011). As a two-dimensional carbon material, graphene has been widely used as counter electrode in DSSC research field, with excellent performance due to its electrical conductivity, porous structure, specific surface area, and corrosion resistance (Kavan et al, 2011; Battumur et al, 2012; Liu et al, 2020a; Liu et al, 2020b; Liu et al, 2020c). The as-synthesized composites material or pure MoS2, polyvinylidene fluoride (PVDF) and carbon black (Super-P) were mixed and ground into N-methylpyrrolidone solvent (NMP) at a mass ratio of 8:1:1 to form suspension and were dropped onto the cleaned F-doped SnO2 (FTO) (resistivity: 14 Ω/□, Nippon Sheet Glass, Japan) glass with 100°C as counter electrodes. The photocurrent density-photovoltage curves (J-V) were measured at one Sun (AM 1.5 G, 100 mWcm−2) by the Newport solar simulator system
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