Edge-selectively antimony-doped graphene nanoplatelets as an outstanding counter electrode with an unusual electrochemical stability for dye-sensitized solar cells employing cobalt electrolytes

2016 ◽  
Vol 4 (23) ◽  
pp. 9029-9037 ◽  
Author(s):  
Hong Mo Kim ◽  
In-Yup Jeon ◽  
In Taek Choi ◽  
Sung Ho Kang ◽  
Sun-Hee Shin ◽  
...  
Keyword(s):  
Counter Electrode ◽  
Dye Sensitized Solar Cells ◽  
Charge Transfer Resistance ◽  
Electrochemical Stability ◽  
Transfer Resistance ◽  
Graphene Nanoplatelet ◽  
Dye Sensitized ◽  
Doped Graphene ◽  
Low Charge ◽  
Sensitized Solar Cells

Edge-selectively antimony-doped graphene nanoplatelet electrocatalysts exhibited an extremely low charge transfer resistance with “zero-loss stability” for a cobalt redox couple.

An in situ polymerized PEDOT/Fe3O4 composite as a Pt-free counter electrode for highly efficient dye sensitized solar cells

RSC Advances ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 1637-1643 ◽  
Author(s):  
Min Zheng ◽  
Jinghao Huo ◽  
Yongguang Tu ◽  
Jinbiao Jia ◽  
Jihuai Wu ◽  
...  
Keyword(s):  
Counter Electrode ◽  
Dye Sensitized Solar Cells ◽  
Charge Transfer Resistance ◽  
High Power Conversion Efficiency ◽  
Transfer Resistance ◽  
Dye Sensitized ◽  
Large Active Area ◽  
Low Charge ◽  
Sensitized Solar Cells

PEDOT/Fe3O4 hybrid is in situ polymerized and used as Pt-free counter electrode in dye-sensitized solar cell. Owing to large active area and low charge transfer resistance for the hybrid, the cell achieves a high power conversion efficiency of 8.69%.

scholarly journals Synthesis of MoIn2S4@CNTs Composite Counter Electrode for Dye-Sensitized Solar Cells

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Gentian Yue ◽  
Renzhi Cheng ◽  
Xueman Gao ◽  
Leqing Fan ◽  
Yangfan Mao ◽  
...  
Keyword(s):  
Counter Electrode ◽  
Electrochemical Impedance ◽  
Dye Sensitized Solar Cells ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Electrochemical Tests ◽  
One Step ◽  
Low Charge ◽  
Adsorption Desorption ◽  
Sensitized Solar Cells

Abstract A ternary and composite MoIn2S4@CNTs counter electrode (CE) with a hedgehog ball structure was synthesized by using a facile one-step hydrothermal method. The composite MoIn2S4@CNTs film possesses large specific surface area through N2 adsorption-desorption isotherms test, which is advantageous to adsorb more electrolyte and provide larger active contact area for the electrode. In addition, the composite MoIn2S4@CNTs CE exhibits low charge transfer resistance and fine electrocatalytic ability made from a series of electrochemical tests including cyclic voltammetry, electrochemical impedance, and Tafel curves. Under optimal conditions, the DSSC based on the MoIn2S4@CNTs-2 composite CE achieves an impressive power conversion efficiency as high as 8.38%, which remarkably exceeds that of the DSSCs with the MoIn2S4 CE (7.44%) and the Pt electrode (8.01%). The current work provides a simplified preparation process for the DSSCs.

Edge-carboxylated graphene nanoplatelets as oxygen-rich metal-free cathodes for organic dye-sensitized solar cells

2014 ◽  
Vol 7 (3) ◽  
pp. 1044-1052 ◽  
Author(s):  
Myung Jong Ju ◽  
In-Yup Jeon ◽  
Kimin Lim ◽  
Jae Cheon Kim ◽  
Hyun-Jung Choi ◽  
...  
Keyword(s):  
Dye Sensitized Solar Cells ◽  
Charge Transfer Resistance ◽  
Electrochemical Stability ◽  
Graphene Nanoplatelets ◽  
Organic Dye ◽  
Transfer Resistance ◽  
Dye Sensitized ◽  
Lower Charge ◽  
Sensitized Solar Cells ◽  
Lower Charge Transfer Resistance

Edge-carboxylated graphene nanoplatelets (ECGnPs) prepared by the dry ball-milling of graphite showed lower charge-transfer resistance (RCT) and better electrochemical stability for the JK-303-based solar cell with Co(bpy)32+/3+ redox couple.

scholarly journals Dye-Sensitized Solar Cells Using Mesocarbon Microbead-Based Counter Electrodes

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Chien-Te Hsieh ◽  
Bing-Hao Yang ◽  
Wei-Yu Chen
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Dye Sensitized Solar Cells ◽  
Charge Transfer Resistance ◽  
Counter Electrodes ◽  
Transfer Resistance ◽  
Dye Sensitized ◽  
Catalytic Sites ◽  
Low Charge ◽  
Sensitized Solar Cells

The dye-sensitized solar cells (DSCs) equipped with mesocarbon microbead (MCMB)-based counter electrodes were explored to examine their cell performance. Three types of nanosized additives including platinum, carbon nanotubes (CNTs), and carbon black (CB) are well dispersed and coated over microscaled MCMB powders. In the design of the counter electrodes, the MCMB graphite offers an excellent medium that allows charge transfer from the ITO substrate to the dye molecule. The active materials such as Pt, CNT, and nanosize CB act as an active site provider for the redox reaction. Among these counter electrodes, the DSCs fabricated with CB electrode exhibit the highest power conversion efficiency. This improved efficiency can be attributed to the fact that the CB nanoparticles not only offer a large number of catalytic sites but also low charge transfer resistance, facilitating a rapid reaction kinetics. Such design of carbon counter electrode has been confirmed to be a promising candidate for replacing Pt electrodes.

Copolymer-templated nitrogen-enriched nanocarbons as a low charge-transfer resistance and highly stable alternative to platinum cathodes in dye-sensitized solar cells

2015 ◽  
Vol 3 (8) ◽  
pp. 4413-4419 ◽  
Author(s):  
Myung Jong Ju ◽  
In Taek Choi ◽  
Mingjiang Zhong ◽  
Kimin Lim ◽  
Jaejung Ko ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Block Copolymers ◽  
High Performance ◽  
Dye Sensitized Solar Cells ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Dye Sensitized ◽  
Low Charge ◽  
Sensitized Solar Cells

High performance N-enriched nanocarbon CEs for organic DSSCs were synthesized by pyrolysis of self-assembled block copolymers.

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.

scholarly journals Electrochemical, Structural and Morphological Characterization of Hydrothermally Fabricated Binary Palladium Alloys PdCo and PdNi

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 796
Author(s):  
Edson Meyer ◽  
Raymond Taziwa ◽  
Dorcas Mutukwa ◽  
Nyengerai Zingwe
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Binary Alloys ◽  
Dye Sensitized Solar Cells ◽  
Charge Transfer Resistance ◽  
Palladium Alloys ◽  
Transfer Resistance ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

This article details the development and characterization of binary palladium alloys synthesized via a hydrothermal process. Palladium alloys, being good redox catalysts, could potentially replace platinum in many applications such as in dye sensitized solar cells, capacitors and vehicular catalytic converters where platinum is vital for maximum productivity. A good replacement should be cheap, readily available and be able to offer comparable catalytic activity to that of platinum. As such we hereby attempt to hydrothermally fabricate and characterize binary palladium alloys PdNi and PdCo that could be ideal replacements for platinum. XRD analysis of the as-synthesized binary alloys revealed the existence of only palladium peaks at 2θ values of 40.1°, 46.7°, 68.1°, 82.1° and 86.6°, indicative of the successful formation of the binary alloys. SEM micrographs revealed that both alloys consisted of spherical particles with PdCo agglomerating to an extent, whereas PdNi was widely distributed, thus it could enhance electrolyte adsorption during catalytic reduction reactions. Cyclic voltammetry analysis at 50 mV∙s−1 revealed that PdNi is more electrocatalytically active with a reduction current density of 41 mA∙cm−2 compared to 18 mA∙cm−2 for PdCo. Lower charge transfer resistance from electrochemical impedance spectroscopy confirmed the superior catalytic ability of PdNi. The two palladium alloys also produced maximum specific capacitances of 68 and 27 F∙g−1 for PdNi and PdCo respectively. Analysis of the sample stability yielded coulombic efficiency retention of 98.7 and 97% for PdNi and PdCo respectively after 1000 cycles. Results obtained have shown that the palladium alloys with their low charge transfer resistance could be ideal replacements for platinum in dye sensitized solar cells. Modest specific capacitance for PdNi illustrates its potential as an electrode catalyst in capacitors.

scholarly journals Low-Cost and Efficient Nickel Nitroprusside/Graphene Nanohybrid Electrocatalysts as Counter Electrodes for Dye-Sensitized Solar Cells

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6563
Author(s):  
Md. Mahbubur Rahman
Keyword(s):  
Solar Cells ◽  
Low Cost ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Solution Process ◽  
Charge Transfer Resistance ◽  
Counter Electrodes ◽  
Transfer Resistance ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Novel nickel nitroprusside (NNP) nanoparticles with incorporated graphene nanoplatelets (NNP/GnP) were used for the first time as a low-cost and effective counter electrode (CE) for dye-sensitized solar cells (DSSCs). NNP was synthesized at a low-temperature (25 °C) solution process with suitable purity and crystallinity with a size range from 5 to 10 nm, as confirmed by different spectroscopic and microscopic analyses. The incorporation of an optimized amount of GnP (0.2 wt%) into the NNP significantly improved the electrocatalytic behavior for the redox reaction of iodide (I-)/tri-iodide (I3-) by decreasing the charge-transfer resistance at the CE/electrolyte interface, lower than the NNP- and GnP-CEs, and comparable to the Pt-CE. The NNP/GnP nanohybrid CE when applied in DSSC exhibited a PCE of 6.13% (under one sun illumination conditions) with the Jsc, Voc, and FF of 14.22 mA/cm2, 0.628 V, and 68.68%, respectively, while the PCE of the reference Pt-CE-based DSSC was 6.37% (Jsc = 14.47 mA/cm2, Voc = 0.635 V, and FF = 69.20%). The low cost of the NNP/GnP hybrid CE with comparable photovoltaic performance to Pt-CE can be potentially exploited as a suitable replacement of Pt-CE in DSSCs.

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