Evaluation of Blister Growth of High Performance Organic Coatings by Electrochemical Impedance Measurements

Si/PEDOT: PSS solar cell is an optional photovoltaic device owing to its promising high photovoltaic conversion efficiency (PCE) and economic manufacture process. In this work, dopamine@graphene was firstly introduced between the silicon substrate and PEDOT:PSS film for Si/PEDOT: PSS solar cell. The dopamine@graphene was proved to be effective in improving the PCE, and the influence of mechanical properties of dopamine@graphene on solar cell performance was revealed. When dopamine@graphene was incorporated into the cell preparation, the antireflection ability of the cell was enhanced within the wavelength range of 300~450 and 650~1100 nm. The enhanced antireflection ability would benefit amount of the photon-generated carriers. The electrochemical impedance spectra test revealed that the introduction of dopamine@graphene could facilitate the separation of carriers and improve the junction quality. Thus, the short-circuit current density and fill factor were both promoted, which led to the improved PCE. Meanwhile, the influence of graphene concentration on device performances was also investigated. The photovoltaic conversion efficiency would be promoted from 11.06% to 13.15% when dopamine@graphene solution with concentration 1.5 mg/mL was applied. The achievements of this study showed that the dopamine@graphene composites could be an useful materials for high-performance Si/PEDOT:PSS solar cells.

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Measurement time versus accuracy trade-off analyzed for electrochemical impedance measurements by means of sine, white noise and step signals

Journal of Electroanalytical Chemistry ◽

10.1016/0022-0728(82)87141-6 ◽

1982 ◽

Vol 138 (1) ◽

pp. 201-208 ◽

Cited By ~ 38

Author(s):

C. Gabrielli ◽

F. Huet ◽

M. Keddam ◽

J.F. Lizee

Keyword(s):

White Noise ◽

Electrochemical Impedance ◽

Measurement Time ◽

Impedance Measurements ◽

Trade Off

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The Detection And Mapping Of Defects In Organic Coatings Using Local Electrochemical Impedance Methods

MRS Proceedings ◽

10.1557/proc-411-31 ◽

1995 ◽

Vol 411 ◽

Author(s):

S. R. Taylor ◽

M. W. Wittmann

Keyword(s):

Electrochemical Impedance ◽

Organic Coatings ◽

Single Frequency ◽

Probe Design ◽

Coating Failure ◽

Local Electrochemical Impedance Spectroscopy ◽

Physical Defects ◽

Steel Substrates ◽

Insight Into

ABSTRACTCoating failure initiates as a local event at defects which can result from chemical heterogeneities in the resin or physical defects such as bubbles, underfilm deposits, or pinholes. The ability to detect, map the location, as well as make quantitative in-situ measurements of coating heterogeneities will help identify the source of failure (i.e. coating chemistry, method of application, cure schedule, etc.) and provide insight into the mechanisms of coating degradation. This study used a 5 electrode arrangement to perform local electrochemical impedance spectroscopy (LEIS) on coated steel substrates. Using single frequency measurements, LEIS could successfully detect and map both intentional chemical heterogeneities and physical defects such as subsurface bubbles, underfilm deposits, and pinholes. Efforts to optimize probe design and instrumentation are ongoing.

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Preparation of yolk–shell structured Ag@Cu particles and their application in high performance electrochemical sensing of p-aminobenzoic acid

Canadian Journal of Chemistry ◽

10.1139/cjc-2018-0223 ◽

2019 ◽

Vol 97 (2) ◽

pp. 140-146

Author(s):

Tian Gan ◽

Zhikai Wang ◽

Mengru Chen ◽

Wanqiu Fu ◽

Haibo Wang ◽

...

Keyword(s):

Electron Microscopy ◽

High Performance ◽

Electrochemical Impedance ◽

High Sensitivity ◽

Differential Pulse ◽

Electrochemical Sensing ◽

High Catalytic Activity ◽

Aminobenzoic Acid ◽

Transmission Electron

In this work, the Ag@Cu particles with yolk–shell nanostructure was prepared by facile solvothermal method, which was modified on glassy carbon electrode (GCE) to fabricate electrochemical sensor for the convenient and fast determination of p-aminobenzoic acid (PABA). The surface morphology and electrochemical properties of the as-prepared Ag@Cu nanocomposite modified electrode were characterized by scanning electron microscopy, transmission electron microscopy, chronocoulometry, and electrochemical impedance spectroscopy. Further, the electrochemical sensing of PABA was performed on the Ag@Cu/GCE using cyclic voltammetry and differential pulse voltammetry techniques, showing high catalytic activity. Under the optimal conditions, the sensor exhibited a wide linear range, high sensitivity, and low detection limit of 0.315 μmol/L for PABA. The developed sensor was also successfully applied for PABA detection in anesthetic and cosmetics with satisfactory results.

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