Electrochemical growth mechanism of nanoporous platinum layers

AbstractPorous platinum is a frequently used catalyst material in electrosynthesis and a robust broadband absorber in thermoelectrics. Pore size distribution and localization determine its properties by a large extent. However, the pore formation mechanism during the growth of the material remains unclear. In this work we elucidate the mechanism underlying electrochemical growth of nanoporous platinum layers and its control by ionic concentration and current density during electrolysis. The electrode kinetics and reduction steps of PtCl4 on platinum electrodes are investigated by cyclic voltammetry and impedance measurements. Cyclic voltammograms show three reduction steps: two steps relate to the platinum cation reduction, and one step relates to the hydrogen reduction. Hydrogen is not involved in the reduction of PtCl4, however it enables the formation of nanopores in the layers. These findings contribute to the understanding of electrochemical growth of nanoporous platinum layers in isopropanol with thickness of 100 nm to 500 nm.

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Production of novel carbon nanostructures by electrochemical reduction of polychlorinated organic rings under mild conditions for supercapacitors

New Journal of Chemistry ◽

10.1039/d1nj01542g ◽

2021 ◽

Author(s):

Züleyha Kudaş ◽

Emir Çepni ◽

Emre Gür ◽

Duygu Ekinci

Keyword(s):

Carbon Source ◽

Electrochemical Reduction ◽

Electrochemical Method ◽

Carbon Nanostructures ◽

Electrochemical Growth ◽

Mild Conditions ◽

One Step ◽

The One ◽

Carbon Based

Here, new carbon-based nanostructures were prepared by the one-step electrochemical method using hexagonal and pentagonal polychlorinated organic rings as carbon source. The electrochemical growth of carbon nanostructures on substrates was...

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Electrochemical synthesis of poly(2-methyl aniline): electrochemical and spectroscopic characterization

Journal of the Serbian Chemical Society ◽

10.2298/jsc0101027b ◽

2001 ◽

Vol 66 (1) ◽

pp. 27-37 ◽

Cited By ~ 28

Author(s):

Aleksandra Buzarovska ◽

Irena Arsova ◽

Ljubomir Arsov

Keyword(s):

Raman Spectroscopy ◽

Cyclic Voltammetry ◽

Redox Reactions ◽

Electrochemical Polymerization ◽

Spectroscopic Characterization ◽

Potential Range ◽

Cyclic Voltammograms ◽

Impedance Measurements ◽

Order Of Magnitude ◽

Poly Aniline

Poly(2-methyl aniline) or poly(ortho-toluidine), as ring substituted derivative of aniline, has been synthesized electrochemically in various concentrations of H2SO4 and HCl, and then characterized by cyclic voltammetry, as well as by impedance and Raman spectroscopy. The cyclic voltammograms of poly(o-toluidine) and poly(aniline) show that the electrochemical polymerization of these two polymers proceeds by almost identical mechanisms. The Raman spectroscopical measurements suggest that the redox reactions of poly(aniline) and poly(o-toluidine) are similar in the potential range between -0.2 and 0.7V vs. SCE. The impedance measurements showed that the conductivity of poly(o-toluidine) is an order of magnitude lower than that of the corresponding poly(aniline) form.

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Structural and electrochemical features of 3D nanoporous platinum electrodes

Electrochimica Acta ◽

10.1016/j.electacta.2009.11.026 ◽

2010 ◽

Vol 55 (6) ◽

pp. 2029-2035 ◽

Cited By ~ 46

Author(s):

Sejin Park ◽

Youn Joo Song ◽

Ji-Hyung Han ◽

Hankil Boo ◽

Taek Dong Chung

Keyword(s):

Platinum Electrodes ◽

Nanoporous Platinum

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Interfacial Reaction and Electrochemical Activity of Thiokol Rubber/Conjugated Polymer Composites

MRS Proceedings ◽

10.1557/proc-461-87 ◽

1996 ◽

Vol 461 ◽

Author(s):

Gong Ke-Cheng ◽

Ma Wen-Shi

Keyword(s):

Carbon Black ◽

Conjugated Polymer ◽

Oxidation Reaction ◽

Reduction Potential ◽

Composite Films ◽

Oxidation Potential ◽

Cyclic Voltammograms ◽

Step Process ◽

One Step ◽

The Stability

ABSTRACTThe highly electroactive thiokol rubber (TR)/ conjugated polymer (eg. polyaniline (PAn) or polypyrrole (PPy)) composite films were prepared by electropolymenzation deposition via one-step process in the electrolytic solutions containing aniline or pyrrole and TR oligomer. The electrocatalysis of PAn or PPy for the electrodepolymerization (reduction)- electropolymenzation (oxidation) reaction of TR in the interface between PAn or PPy and TR is determined by cyclic voltammograms. The differeme between the oxidation potential and the reduction potential is 0.05V and 0.36V or less for TR/PAn and TR/PPy composite films, respectively The chemical bands between the nitrogen atoms of PAn or PPy and the mercaptan groups of TR (oligomer) are formed in the electropolymenzation process that is indicated by XPS. The conductivities of TR/PAn and TR/PPy composite films and the stability of the cells consisting of those films are remarkably improved after electrochemical reduction with addition of a suitable conducting carbon black.

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The effect of precipitation and deposition layer growth on impedance measurements

tm - Technisches Messen ◽

10.1515/teme-2018-0062 ◽

2019 ◽

Vol 86 (1) ◽

pp. 25-33

Author(s):

Ronnie Anseth ◽

Nils-Olav Skeie ◽

Magne Waskaas

Keyword(s):

Measurement System ◽

Electrochemical Cell ◽

Electrochemical Impedance ◽

Solution Concentration ◽

Ionic Concentration ◽

Layer Growth ◽

Impedance Measurements ◽

Interfacial Capacitance ◽

Measurable Change ◽

Impedance Magnitude

AbstractThe objective of the study was to examine how precipitation and deposition layer growth in an electrochemical cell impact impedance measurements. A measurement system, based on Electrochemical Impedance Spectroscopy (EIS), was used to observe the impedance of an electrochemical cell while precipitation was occurring. The measurement system was also used together with measurements of the solution concentration (in parts per million, ppm) to examine what impact deposition layer growth has on an electrochemical cell. Experimental results indicate a measurable change in the impedance magnitude as the ionic concentration is altered through precipitation. A change in both impedance magnitude and the interfacial capacitance was observed when a deposition layer was established within an electrochemical cell. Results show that impedance measurements are susceptible to changes in solution conductivity and to the presence of a deposition layer in an electrochemical cell. Impedance measurements may be used as an indicator for deposition layer growth, but changes in the solution concentration should be considered when creating a model.

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