Preliminary investigation of the impact of polymer composition on electrochemical properties of coatings as determined by electrochemical impedance spectroscopy

2013 ◽  
Vol 10 (6) ◽  
pp. 865-878 ◽  
Author(s):  
Vinod Upadhyay ◽  
Umesh D. Harkal ◽  
Dean C. Webster ◽  
Gordon P. Bierwagen
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Properties ◽  
Electrochemical Impedance ◽  
Preliminary Investigation ◽  
Polymer Composition ◽  
Properties Of Coatings ◽  
The Impact

scholarly journals Electrochemical Impedance Spectroscopy as a Diagnostic Tool in Polymer Electrolyte Membrane Electrolysis

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1368 ◽  
Author(s):  
Stefania Siracusano ◽  
Stefano Trocino ◽  
Nicola Briguglio ◽  
Vincenzo Baglio ◽  
Antonino Aricò
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Polymer Electrolyte ◽  
Diagnostic Tool ◽  
Electrochemical Impedance ◽  
Polymer Electrolyte Membrane ◽  
Membrane Electrode ◽  
Short Side ◽  
Electrolyte Membrane ◽  
The Impact

Membrane–electrode assemblies (MEAs) designed for a polymer electrolyte membrane (PEM) water electrolyser based on a short-side chain (SSC) perfluorosulfonic acid (PFSA) membrane, Aquivion®, and an advanced Ir-Ru oxide anode electro-catalyst, with various cathode and anode noble metal loadings, were investigated. Electrochemical impedance spectroscopy (EIS), in combination with performance and durability tests, provided useful information to identify rate-determining steps and to quantify the impact of the different phenomena on the electrolysis efficiency and stability characteristics as a function of the MEA properties. This technique appears to be a useful diagnostic tool to individuate different phenomena and to quantify their effect on the performance and degradation of PEM electrolysis cells.

scholarly journals Influencia del tipo de sinterizado en el comportamiento anticorrosivo de recubrimientos sol-gel

Respuestas ◽  
2016 ◽  
Vol 13 (2) ◽  
pp. 5-10
Author(s):  
Jorge Hernando Bautista-Ruiz ◽  
César Armando Ortiz-Otálora ◽  
Enrique Vera-Lopez
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Steel Substrate ◽  
Sol Gel ◽  
Dip Coating ◽  
Sintering Process ◽  
Properties Of Coatings ◽  
Corrosive Attack ◽  
Plasma Sintering

Este trabajo muestra un estudio electroquímico de recubrimientos SiO2 TiO2 ZrO2 obtenidos por el método sol-gel, sinterizados vía plasma y vía convencional. Los recubrimientos se conformaron a partir de Si(OC2H5)4, Ti(OBu)4 y Zr(OC3H7)4, se depositaron sobre sustratos de acero ANSI/304 mediante dip-coating en monocapa y bicapa. El proceso de densificado vía plasma se realizó a temperaturas del sustrato de 250 ºC, 300 ºC y 330 ºC y el convencional a 400 ºC y a una velocidad de calentamiento de 2 ºC/min. El comportamiento anticorrosivo se estudió mediante las técnicas de espectroscopía de impedancia electroquímica (EIS) y Tafel. Se observó que el proceso de sinterización vía plasma, mejora la resistencia a la corrosión con respecto al método convencional.Palabras Clave: sol-gel; corrosión; plasma; EIS;Tafel Abstract This work shows a comparative electrochemical study among the anticorrosive properties of coatings SiO2 TiO2 ZrO2 obtained by the method sol-gel and plasma sintering process and conventional. The coatings conformed to starting from Si(OC2 H5 )4 , Ti(OBu)4 and Zr(OC3 H7 )4 . These were deposited on steel substrate 304 by means of dip-coating in mono-layer and bi-layer. The plasma sintering process was carried out to temperatures of the substrate of 250 ºC, 300 ºC and 330 ºC and the conventional to 400 ºC and a speed of heating of 2 ºC/min. the anticorrosive behavior was studied by means of the techniques of electrochemical impedance spectroscopy (EIS) and Tafel. It was observed that the plasma sintering process, it improves the resistance to the corrosive attack to in regard to the conventional method.Keywords: sol-gel, corrosion, plasma, EIS, Tafel

scholarly journals Studies on Anion Exchange Membrane and Interface Properties by Electrochemical Impedance Spectroscopy: The Role of pH

Membranes ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 771
Author(s):  
Wenjuan Zhang ◽  
Wei Cheng ◽  
Ramato Ashu Tufa ◽  
Caihong Liu ◽  
David Aili ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Ion Exchange ◽  
Electrochemical Properties ◽  
Anion Exchange ◽  
Structural Changes ◽  
Electrochemical Impedance ◽  
Transport Processes ◽  
Anion Exchange Membranes ◽  
Interface Properties

Ion-exchange membranes (IEMs) represent a key component in various electrochemical energy conversion and storage systems. In this study, electrochemical impedance spectroscopy (EIS) was used to investigate the effects of structural changes of anion exchange membranes (AEMs) on the bulk membrane and interface properties as a function of solution pH. The variations in the physico/electrochemical properties, including ion exchange capacity, swelling degree, fixed charge density, zeta potentials as well as membrane and interface resistances of two commercial AEMs and cation exchange membranes (CEMs, as a control) were systematically investigated in different pH environments. Structural changes of the membrane surface were analyzed by Fourier transform infrared and X-ray photoelectron spectroscopy. Most notably, at high pH (pH > 10), the membrane (Rm) and the diffusion boundary layer resistances (Rdbl) increased for the two AEMs, whereas the electrical double layer resistance decreased simultaneously. This increase in Rm and Rdbl was mainly attributed to the deprotonation of the tertiary amino groups (-NR2H+) as a membrane functionality. Our results show that the local pH at the membrane-solution interface plays a crucial role on membrane electrochemical properties in IEM transport processes, particularly for AEMs.

scholarly journals Electrochemical Impedance Spectroscopy (EIS): Principles, Construction, and Biosensing Applications

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6578
Author(s):  
Hend S. Magar ◽  
Rabeay Y. A. Hassan ◽  
Ashok Mulchandani
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
State Of The Art ◽  
Theoretical Background ◽  
Review Article ◽  
Antigen Recognition ◽  
Biomedical Diagnosis ◽  
Basic Concepts ◽  
The Impact

Electrochemical impedance spectroscopy (EIS) is a powerful technique used for the analysis of interfacial properties related to bio-recognition events occurring at the electrode surface, such as antibody–antigen recognition, substrate–enzyme interaction, or whole cell capturing. Thus, EIS could be exploited in several important biomedical diagnosis and environmental applications. However, the EIS is one of the most complex electrochemical methods, therefore, this review introduced the basic concepts and the theoretical background of the impedimetric technique along with the state of the art of the impedimetric biosensors and the impact of nanomaterials on the EIS performance. The use of nanomaterials such as nanoparticles, nanotubes, nanowires, and nanocomposites provided catalytic activity, enhanced sensing elements immobilization, promoted faster electron transfer, and increased reliability and accuracy of the reported EIS sensors. Thus, the EIS was used for the effective quantitative and qualitative detections of pathogens, DNA, cancer-associated biomarkers, etc. Through this review article, intensive literature review is provided to highlight the impact of nanomaterials on enhancing the analytical features of impedimetric biosensors.

Graphene-NiO Composite Electrode for Supercapacitors

2011 ◽  
Vol 345 ◽  
pp. 75-78 ◽  
Author(s):  
Wei Zhou ◽  
Man Lin Tan ◽  
Xiao Song Zhou
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Composite Electrode ◽  
Electrochemical Impedance ◽  
Graphene Sheets ◽  
Supercapacitor Electrode ◽  
Scan Rate

In this paper, a facilesolution method was employed to synthesize the graphene-NiO composite. SEM and XRD results indicated the graphene sheets were covered by the NiO nanoplates. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to measure the electrochemical properties of the composite. The specific capacitance reached 1292F/g at a scan rate of 5mV/s. The results show that this composite is a promising material for supercapacitor electrode.

Modeling the impedance spectra of mixed conducting thin films with exposed and embedded current collectors

2017 ◽  
Vol 19 (38) ◽  
pp. 26310-26321 ◽  
Author(s):  
Jiapeng Liu ◽  
Francesco Ciucci
Keyword(s):  
Thin Films ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Impedance Spectra ◽  
Current Collectors ◽  
The Impact

This article studies the electrochemical impedance spectroscopy response of mixed ionic-electronic conducting (MIEC) films with embedded current collectors (CCs). Even though the MIEC surface is fully exposed, the impact of the CCs can be significant.

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