Effect of Graphene Layer Number on the Performances of Graphene Nanosheets Counter Electrode for Dye-Sensitized Solar Cells

2013 ◽  
Vol 750-752 ◽  
pp. 923-926
Author(s):  
Shun Jian Xu ◽  
Yu Feng Luo ◽  
Wei Zhong ◽  
Zong Hu Xiao ◽  
Yong Ping Luo ◽  
...  
Keyword(s):  
Solar Cells ◽  
Graphene Layer ◽  
Counter Electrode ◽  
Electrochemical Impedance ◽  
Graphene Nanosheets ◽  
Dye Sensitized Solar Cells ◽  
Layer Number ◽  
Dye Sensitized ◽  
Electrode Lead ◽  
Sensitized Solar Cells

Four types of graphene nanosheets (GNs) with different graphene layer number were employed to fabricate counter electrode for dyesensitized solar cells (DSCs), with emphasis on understanding the influence of graphene layer number on the properties of the counter electrode and the device. The results show that with the graphene layer number of the GNs increases from 3 to 8, both efficiency and fill factor of the GNs based DSCs firstly climb and reach a peak at 6 of graphene layer number, and then decline with further increasing. Electrochemical impedance spectroscopy (EIS) reveals that when the graphene layer number of the GNs increases from 3 to 6, the decreased sheet resistance of the electrode and the strengthened capability of electrolyte diffusion in the electrode result in the improvement of the photovoltaic performances of the DSCs. However, when the graphene layer number further ascends to 8, the weakened capabilities of both catalytic activity of the electrode for the reduction and electrolyte diffusion in the electrode lead to the poor photovoltaic performances of the device.

Microwave-assisted exfoliation method to develop platinum-decorated graphene nanosheets as a low cost counter electrode for dye-sensitized solar cells

RSC Advances ◽  
2014 ◽  
Vol 4 (68) ◽  
pp. 36226-36233 ◽  
Author(s):  
K. Saranya ◽  
N. Sivasankar ◽  
A. Subramania
Keyword(s):  
Solar Cells ◽  
Counter Electrode ◽  
Graphene Nanosheets ◽  
Low Cost ◽  
Dye Sensitized Solar Cells ◽  
Natural Graphite ◽  
Dye Sensitized ◽  
Microwave Assisted ◽  
Sensitized Solar Cells

Graphene nanosheets (GNs) are prepared from natural graphite by a simple ecofriendly microwave-assisted exfoliation technique.

Graphene nanosheets inserted by silver nanoparticles as zero-dimensional nanospacers for dye sensitized solar cells

Nanoscale ◽  
2014 ◽  
Vol 6 (10) ◽  
pp. 5410-5415 ◽  
Author(s):  
Quanhong Chang ◽  
Zhenping Wang ◽  
Jinzhong Wang ◽  
Yuan Yan ◽  
Zhoujing Ma ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Solar Cells ◽  
Counter Electrode ◽  
Electrode Materials ◽  
Graphene Nanosheets ◽  
Dye Sensitized Solar Cells ◽  
Three Dimensional ◽  
Ag Nanoparticle ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Three-dimensional Ag nanoparticle/GNs hybrids as highly efficient counter electrode materials for dye sensitized solar cells are described, highlighting the Ag nanoparticles as zero-dimensional nanospacers inserting into GNs to lift the interspacing layer between individual GNs.

A Light Harvesting Policy on Black Counter Electrode for Enhanced Performance of Dye-Sensitized Solar Cells

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Chi-Hui Chien ◽  
Ming-Lang Tsai ◽  
Chi-Chang Hsieh ◽  
Yan-Huei Li ◽  
Yuh J. Chao
Keyword(s):  
Solar Cells ◽  
Counter Electrode ◽  
Light Harvesting ◽  
Electrochemical Impedance ◽  
Dye Sensitized Solar Cells ◽  
Tio2 Electrode ◽  
Electrochemical Impedance Spectra ◽  
Transfer Resistance ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

This work presents a novel light harvesting policy for a black counter electrode (BCE) to enhance the performance of dye-sensitized solar cells (DSSCs), which uses a metal-based light scattering layer (MLSL) that is formed from Al@SiO2 core-shell microflakes prepared and coated on BCE. DSSCs based on BCE with and without the MLSL are compared as well. Analysis results of electrochemical impedance spectra (EIS) indicate that, while not affecting the charge transfer resistance at BCE, MLSL exhibits a low electron transport resistance in the TiO2/electrolyte interface. Our results further demonstrate that MLSL reflects light to the TiO2 electrode, subsequently increasing photocurrent density by 68.68% (from 2.65 to 4.47 mA/cm2) and improving the power conversion efficiency by 49.64%.

Dye-Sensitized Solar Cells Employing Graphene Nanosheets as Counter Electrode

2013 ◽  
Vol 33 (10) ◽  
pp. 1023003
Author(s):  
徐顺建 Xu Shunjian ◽  
罗玉峰 Luo Yufeng ◽  
钟炜 Zhong Wei ◽  
肖宗湖 Xiao Zonghu ◽  
罗永平 Luo Yongping
Keyword(s):  
Solar Cells ◽  
Counter Electrode ◽  
Graphene Nanosheets ◽  
Dye Sensitized Solar Cells ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

A Novel Counter Electrode Based on Hierarchical Porous Carbon for Dye-Sensitized Solar Cells

2011 ◽  
Vol 685 ◽  
pp. 1-5 ◽  
Author(s):  
Gui Qiang Wang ◽  
Wei Xing ◽  
Shu Ping Zhuo
Keyword(s):  
Solar Cells ◽  
Mesoporous Carbon ◽  
Counter Electrode ◽  
Electrochemical Impedance ◽  
Dye Sensitized Solar Cells ◽  
Koh Activation ◽  
Dye Sensitized ◽  
Hierarchical Porous ◽  
Hierarchical Porous Carbons ◽  
Sensitized Solar Cells

Hierarchical porous carbons (HPC) were synthesized by a combination of self-assembly and chemical activation method. A mesoporous carbon with large-size pore was used as raw materials. N2sorption measurement indicated that plenty of micropores generated within the mesopore wall in the mesoporous carbon during KOH activation. Electrochemical impedance spectroscopy measurement demonstrated a high electrocatalytic activity of HPC electrode for triiodide reduction. The overall conversion efficiency of dye-sensitized solar cells with HPC counter electrode was 6.48%, which is similar to that of the device with conventional Pt counter electrode.

High Electrocatalytic and Wettable Nitrogen-Doped Microwave-Exfoliated Graphene Nanosheets as Counter Electrode for Dye-Sensitized Solar Cells

Small ◽  
2014 ◽  
Vol 10 (16) ◽  
pp. 3347-3353 ◽  
Author(s):  
Peng Zhai ◽  
Tzu-Chien Wei ◽  
Ya-Huei Chang ◽  
Yu-Ting Huang ◽  
Wei-Ting Yeh ◽  
...  
Keyword(s):  
Solar Cells ◽  
Counter Electrode ◽  
Graphene Nanosheets ◽  
Dye Sensitized Solar Cells ◽  
Nitrogen Doped ◽  
Dye Sensitized ◽  
Exfoliated Graphene ◽  
Sensitized Solar Cells

scholarly journals Electrolyte Tuning in Iron(II)-Based Dye-Sensitized Solar Cells: Different Ionic Liquids and I2 Concentrations

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3053
Author(s):  
Mariia Becker ◽  
Catherine E. Housecroft ◽  
Edwin C. Constable
Keyword(s):  
Ionic Liquids ◽  
Solar Cells ◽  
Counter Electrode ◽  
Electrochemical Impedance ◽  
Dye Sensitized Solar Cells ◽  
Diffusion Resistance ◽  
Transfer Resistance ◽  
Dye Sensitized ◽  
Average Maximum ◽  
Sensitized Solar Cells

The effects of different I2 concentrations and different ionic liquids (ILs) in the electrolyte on the performances of dye-sensitized solar cells (DSCs) containing an iron(II) N-heterocyclic carbene dye and containing the I–/I3– redox shuttle have been investigated. Either no I2 was added to the electrolyte, or the initial I2 concentrations were 0.02, 0.05, 0.10, and 0.20 M. The short-circuit current density (JSC), open-circuit voltage (VOC), and the fill factor (ff) were influenced by changes in the I2 concentration for all the ILs. For 1-hexyl-3-methylimidazole iodide (HMII), low VOC and low ff values led to poor DSC performances. Electrochemical impedance spectroscopy (EIS) showed the causes to be increased electrolyte diffusion resistance and charge transfer resistance at the counter electrode. DSCs containing 1,3-dimethylimidazole iodide (DMII) and 1-ethyl-3-methylimidazole iodide (EMII) showed the highest JSC values when 0.10 M I2 was present initially. Short alkyl substituents (Me and Et) were more beneficial than longer chains. The lowest values of the transport resistance in the photoanode semiconductor were found for DMII, EMII, and 1-propyl-2,3-dimethylimidazole iodide (PDMII) when no I2 was added to the initial electrolyte, or when [I2] was less than 0.05 M. Higher [I2] led to decreases in the diffusion resistance in the electrolyte and the counter electrode resistance. The electron lifetime and diffusion length depended upon the [I2]. Overall, DMII was the most beneficial IL. A combination of DMII and 0.1 M I2 in the electrolyte produced the best performing DSCs with an average maximum photoconversion efficiency of 0.65% for a series of fully-masked cells.

An Efficient Metal Conductor Paste/Nanoporous Carbon Composite Counter Electrode for Dye-Sensitized Solar Cells

2011 ◽  
Vol 347-353 ◽  
pp. 390-393 ◽  
Author(s):  
Shun Jian Xu ◽  
Yu Feng Luo ◽  
Wei Zhong ◽  
Guan Jun Qiao
Keyword(s):  
Solar Cells ◽  
Counter Electrode ◽  
Electrochemical Impedance ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Nanoporous Carbon ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

A novel counter electrode has been fabricated at low temperature using nanoporous carbon (NC) with about 35 nm pore size as based catalysis materials and silver conductor paste (SCP) as connecting adhesive. The efficiency of dye-sensitized solar cells (DSCs) employing this SCP/NC electrode reaches to 5.91%, which is 15% higher than that of DSCs with NC electrode. The improved efficiency is attributed to the enhancement in the fill factor and the short circuit photocurrent density. Electrochemical impedance spectroscopy reveals that all of charge transfer resistance, ohmic serial resistance and Nernst diffusion impedance of SCP/NC electrode decrease compared with NC electrode. Especially, the efficiency of 5.91% is comparable to that of DSCs with Pt electrode.

Sign in / Sign up

Export Citation Format

Share Document