“…Even though TiO 2 itself has low efficiency (0.001%), the PCE of TiO 2 incorporated with PEDOT-GO composite gives a promising result with the PCE of 1.166%. The PCE of PEDOT-GO/TiO 2 CE is higher than platinum CE (0.727%) and comparable with conducting polymer based CEs reported in the literature [41,42]. The novel PEDOT-GO/TiO 2 CE produced in this work is a promising CE due to an enhance PCE observed in PEDOT-GO/TiO 2 CE compared to PEDOT-GO, PEDOT, and TiO 2 CEs.…”
PEDOT-based material counter electrodes (CEs) are recently given an enormous attention as new renewable energy sources due to their cost-effectiveness and accessibility, coupled with the simplicity of production. The existing dye-sensitized solar cells (DSSCs) are expensive because they are made using platinum-based glass electrode. In this work, a new CE, that is, poly(3,4-ethylenedioxythiophene)-graphene oxide/titanium dioxide (PEDOT-GO/TiO 2 ) with a low charge transfer resistance ( ct = 9.0 Ω), was fabricated. In addition, PEDOT-GO/TiO 2 CE possesses a good electrocatalytic activity (ECA) toward the tri-iodide ions reduction and an improved efficiency of 1.166% was reached in DSSC.
“…Even though TiO 2 itself has low efficiency (0.001%), the PCE of TiO 2 incorporated with PEDOT-GO composite gives a promising result with the PCE of 1.166%. The PCE of PEDOT-GO/TiO 2 CE is higher than platinum CE (0.727%) and comparable with conducting polymer based CEs reported in the literature [41,42]. The novel PEDOT-GO/TiO 2 CE produced in this work is a promising CE due to an enhance PCE observed in PEDOT-GO/TiO 2 CE compared to PEDOT-GO, PEDOT, and TiO 2 CEs.…”
PEDOT-based material counter electrodes (CEs) are recently given an enormous attention as new renewable energy sources due to their cost-effectiveness and accessibility, coupled with the simplicity of production. The existing dye-sensitized solar cells (DSSCs) are expensive because they are made using platinum-based glass electrode. In this work, a new CE, that is, poly(3,4-ethylenedioxythiophene)-graphene oxide/titanium dioxide (PEDOT-GO/TiO 2 ) with a low charge transfer resistance ( ct = 9.0 Ω), was fabricated. In addition, PEDOT-GO/TiO 2 CE possesses a good electrocatalytic activity (ECA) toward the tri-iodide ions reduction and an improved efficiency of 1.166% was reached in DSSC.
“…ZnO‐DSSCs with carbon‐based counter electrodes, the DSA‐electrodes introduced here perform at least at par. The best efficiency obtained in this study ( η =4.1 % using the bilayer G|MWCNT electrode) exceeds the efficiencies reported by Pandikumar and coworkers, who report efficiencies of 2 % using a polypyrrole/rGO/p‐toluenesulfate composite as counter electrode. The solar cells reported here also outperform solar cells, in which the ZnO anode is sensitized by quantum dots and an ordered mesocellular carbon foam functions as counter electrode.…”
We describe the preparation and properties of bilayers of graphene‐ and multi‐walled carbon nanotubes (MWCNTs) as an alternative to conventionally used platinum‐based counter electrode for dye‐sensitized solar cells (DSSC). The counter electrodes were prepared by a simple and easy‐to‐implement double self‐assembly process. The preparation allows for controlling the surface roughness of electrode in a layer‐by‐layer deposition. Annealing under N2 atmosphere improves the electrode's conductivity and the catalytic activity of graphene and MWCNTs to reduce the I3− species within the electrolyte of the DSSC. The performance of different counter‐electrodes is compared for ZnO photoanode‐based DSSCs. Bilayer electrodes show higher power conversion efficiencies than monolayer graphene electrodes or monolayer MWCNTs electrodes. The bilayer graphene (bottom)/MWCNTs (top) counter electrode‐based DSSC exhibits a maximum power conversion efficiency of 4.1 % exceeding the efficiency of a reference DSSC with a thin film platinum counter electrode (efficiency of 3.4 %). In addition, the double self‐assembled counter electrodes are mechanically stable, which enables their recycling for DSSCs fabrication without significant loss of the solar cell performance.
“…The morphology of the PPy changed drastically when GO was introduced into the aqueous solution, with no clear distinction between the PPy and GO [31]. In the presence of the catalyst, the PPy-rGO-2 images reveal a highly porous network with an extended and continuous morphology [32], as displayed in Fig. 1d.Fig.…”
A nanocomposite comprising of polypyrrole and reduced graphene oxide was electrodeposited onto a carbon bundle fibre (CBF) through a two-step approach (CBF/PPy-rGO-2). The CBF/PPy-rGO-2 had a highly porous structure compared to a nanocomposite of polypyrrole and reduced graphene oxide that was electrodeposited onto a CBF in a one-step approach (CBF/PPy-rGO), as observed through a field emission scanning electron microscope. An X-ray photoelectron spectroscopic analysis revealed the presence of hydrogen bond between the oxide functional groups of rGO and the amine groups of PPy in PPy-rGO-2 nanocomposite. The fabricated CBF/PPy-rGO-2 nanocomposite material was used as an electrode material in a symmetrical solid-state supercapacitor, and the device yielded a specific capacitance, energy density and power density of 96.16 F g− 1, 13.35 Wh kg− 1 and of 322.85 W kg− 1, respectively. Moreover, the CBF/PPy-rGO-2 showed the capacitance retention of 71% after 500 consecutive charge/discharge cycles at a current density of 1 A g− 1. The existence of a high degree of porosity in CBF/PPy-rGO-2 significantly improved the conductivity and facilitated the ionic penetration. The CBF/PPy-rGO-2-based symmetrical solid-state supercapacitor device demonstrated outstanding pliability because the cyclic voltammetric curves remained the same upon bending at various angles.Graphical AbstractCarbon bundle fibre modified with porous polypyrrole/reduced graphene oxide nanocomposite for flexible miniature solid-state supercapacitor.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-017-2010-3) contains supplementary material, which is available to authorized users.
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