Chemically-modified electrodes in photoelectrochemical cells

1983 ◽  
Vol 61 (5) ◽  
pp. 888-893 ◽  
Author(s):  
Marye Anne Fox ◽  
James R. Hohman ◽  
Prashant V. Kamat
Keyword(s):  
Titanium Dioxide ◽  
Excited State ◽  
Electrochemical Properties ◽  
Tin Oxide ◽  
Modified Electrodes ◽  
Photoelectrochemical Cells ◽  
Time Resolved ◽  
Chemically Modified ◽  
Modified Surfaces ◽  
Semiconductor Electrodes

Tin oxide and titanium dioxide semiconductor electrodes have been covalently modified by the attachment of functionalized olefins and arenes through surface silanation or via a cyanuric chloride linkage. The excited state and electrochemical properties of the molecules so attached are significantly affected by the semiconductor. Photocurrent measurements and time-resolved laser coulostatic monitoring have been employed to elucidate the mechanism of charge injection on these modified surfaces.

A Novel Photochemical Route For Modifying Surfaces: Prospects And Applications.

1991 ◽  
Vol 227 ◽  
Author(s):  
Mark A. Harmer
Keyword(s):  
Tin Oxide ◽  
Electrode Surface ◽  
Modified Electrodes ◽  
Protonated Form ◽  
Oxide Electrode ◽  
Acid Base ◽  
Chemically Modified ◽  
Modified Surfaces ◽  
Potential Applications ◽  
Photochemical Route

ABSTRACTPotential applications of a very general route to photochemically modifying a range of surfaces will be described. Surfaces which have been modified vary considerably and include polyimide, polyethylene, fluoropolymers, polyester, glass, tin oxide and aluminum. Photoactivated azides, for example 3-azidopyridine, have been found to be very effective at modifying a range of surfaces. Using this method organic type functional groups, in this case pyridine type groups, can be photografted on to the surface. As a result of photomodification the surface properties change. In the case of polyethylene for example the surface becomes more hyrophilic and shows improved adhesion to metals. These modified surfaces also display acid-base character. In the protonated form anions can be exchanged into the film. This method has been used to modify a metal oxide electrode surface to develop chemically modified electrodes. The process may also be used in lithography.

Voltammetric determination of copper and zinc in water using a Ruthenium bipyridyl/Nafion-modified indium tin oxide-coated glass electrode

2017 ◽  
Vol 20 (3) ◽  
pp. 089-093 ◽  
Author(s):  
Shirley Tiong Palisoc ◽  
Michelle Tiamzon Natividad ◽  
Craig Egan Allistair Dumanon Tan
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Water Samples ◽  
Tap Water ◽  
Supporting Electrolyte ◽  
Anodic Stripping Voltammetry ◽  
Modified Electrodes ◽  
Glass Electrode ◽  
Coated Glass ◽  
Chemically Modified

Chemically-modified Indium Tin Oxide (ITO) coated glass substrates were fabricated by depositing Nafion thin films doped with tris (2,2’-bipyridyl) ruthenium(II) dichloride hexahydrate via drop coating deposition technique. The Nafion volume concentration in the film is 1% (v/v) and the mediator concentration is 5 mg per 1 mL Nafion. The chemically-modified electrodes were characterized by cyclic voltammetry (CV) and were used as working electrodes to detect varying concentrations of copper (Cu2+) and zinc (Zn2+) in a 0.1 M NaCl supporting electrolyte solution via Anodic Stripping Voltammetry (ASV). Cu2+ and Zn2+ ions were successfully determined by ASV. The limits of detection for Cu2+ and Zn2+ were 0.1 ppm and 0.7 ppm, respectively. The modified electrodes were used to determine the presence of Cu2+ and Zn2+ in different real water samples. The presence of Cu2+ was successfully determined in deep well, lake, and tap water samples, while the presence of Zn2+ was successfully determined in sea and tap water samples. Atomic Absorption Spectroscopy (AAS) results confirm the presence of Cu2+ and Zn2+ in the samples.

scholarly journals Tin Oxide Modified Titanium Dioxide as Electron Transport Layer in Formamidinium-Rich Perovskite Solar Cells

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7870
Author(s):  
R. K. Koech ◽  
Reisya Ichwani ◽  
D. O. Oyewole ◽  
M. Kigozi ◽  
D. Amune ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Solar Cells ◽  
Electron Transport ◽  
Tin Oxide ◽  
Electrochemical Impedance ◽  
Perovskite Solar Cells ◽  
Optoelectronic Properties ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Time Resolved

The design of electron transport layers (ETLs) with good optoelectronic properties is one of the keys to the improvement of the power conversion efficiencies (PCEs) and stability of perovskite solar cells (PSCs). Titanium dioxide (TiO2), one of the most widely used ETL in PSCs, is characterized by low electrical conductivity that increases the series resistance of PSCs, thus limiting their PCEs. In this work, we incorporated tin oxide (SnO2) into titanium dioxide (TiO2) and studied the evolution of its microstructural and optoelectronic properties with SnO2 loading. The thin films were then integrated as ETLs in a regular planar Formamidinium (FA)-rich mixed lead halide PSCs so as to assess the overall effect of SnO2 incorporation on their charge transport and Photovoltaic (PV) characteristics. Analysis of the fabricated PSCs devices revealed that the best performing devices; based on the ETL modified with 0.2 proportion of SnO2; had an average PCE of 17.35 ± 1.39%, which was about 7.16% higher than those with pristine TiO2 as ETL. The improvement in the PCE of the PSC devices with 0.2 SnO2 content in the ETL was attributed to the improved electron extraction and transport ability as revealed by the Time Resolved Photoluminescence (TRPL) and Electrochemical Impedance Spectroscopy (EIS) studies.

Electrochemical Analysis and Applications of New Carbon Materials with Properties of Composite Materials

2012 ◽  
Vol 583 ◽  
pp. 75-81
Author(s):  
Xin Hua ◽  
Gui Jun Shen ◽  
Yu Du
Keyword(s):  
Carbon Nanotube ◽  
Composite Materials ◽  
Electrochemical Properties ◽  
Carbon Materials ◽  
Modified Electrodes ◽  
Electrochemical Analysis ◽  
Chemically Modified Electrodes ◽  
Chemically Modified ◽  
Current Review ◽  
New Carbon Materials

New carbon materials such as carbon nanotube and graphene will play very important roles in the future life. All of the electrochemical properties and applications of these materials as well as electrochemical analysis applications of physical and chemically modified electrodes based on them would be reviewed. Hence, the scope of the current review is limited to analytical electrochemistry using these two carbon materials, and 60 references are cited.

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