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Active Thermoelectrochemistry

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Electrochemistry".

Deadline for manuscript submissions: closed (31 March 2020) | Viewed by 6509

Special Issue Editor


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Guest Editor
1. Professor Emeritus, Rostock University, D-18051 Rostock, Germany
2. Scientific Coworker, Leibniz Institute for Solid State and Materials Research Dresden, D 01069 Dresden, Germany
Interests: electrochemistry at heated electrodes; chemical sensors; analytical chemistry; computer controlled electrochemical instrumentation, including software development

Special Issue Information

Dear Colleagues,

The field of thermoelectrochemistry has experienced a revival through a new direction commonly characterized as active thermoelectrochemistry. Prominent terms are, e.g., heated electrodes, hot-wire electrochemistry, sonoelectrochemistry or microwave electrochemistry. In all these new methods, temperature is used intentionally as an active parameter in an analogous manner to voltage or current.

Active thermoelectrochemistry does not mean just warming up or cooling down an electrochemical cell to study something at varied temperatures. Instead, localized regions in cells are preferred objects; consequently, non-isothermal cells are utilized. Electrodes are heated by Joule heat, by microwaves, by laser, or by friction. Further, heat is transferred in both directions by means of Peltier elements. Typically, localized regions with forced temperature inside non-isothermal electrochemical cells are the subject of investigations.

Heated or cooled electrode surfaces inside classical cells may provide results which otherwise would not be available. Volatile or unstable substances can be analyzed at increased temperatures without damaging the bulk content, and superheated water in local spots can be used as an ordinary solvent. Stripping analysis has been greatly improved this way, and electrochemoluminescence has proven successful at heated electrodes. Even a hot-tip electrode for SECM seems to be possible.

You are kindly invited to contribute to this Special Issue.

Prof. Dr. Peter Gründler
Guest Editor

Manuscript Submission Information

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Keywords

  • Electrochemistry
  • Chemical sensors
  • Hot-wire electrochemistry
  • Hot electrodes

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Published Papers (2 papers)

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Research

10 pages, 2431 KiB  
Article
Thermocells for Hybrid Photovoltaic/Thermal Systems
by Gilyong Shin, Jei Gyeong Jeon, Ju Hyeon Kim, Ju Hwan Lee, Hyeong Jun Kim, Junho Lee, Kyung Mook Kang and Tae June Kang
Molecules 2020, 25(8), 1928; https://doi.org/10.3390/molecules25081928 - 21 Apr 2020
Cited by 6 | Viewed by 3287
Abstract
The photovoltaic conversion efficiency of solar cells is highly temperature dependent and decreases with increasing temperature. Therefore, the thermal management of solar cells is crucial for the efficient utilization of solar energy. We fabricate a hybrid photovoltaic/thermocell (PV/T) module by integrating a thermocell [...] Read more.
The photovoltaic conversion efficiency of solar cells is highly temperature dependent and decreases with increasing temperature. Therefore, the thermal management of solar cells is crucial for the efficient utilization of solar energy. We fabricate a hybrid photovoltaic/thermocell (PV/T) module by integrating a thermocell directly into the back of a solar panel and explore the feasibility of the module for its practical implementation. The proposed PV/T hybrid not only performs the cooling of the solar cells but also produces an additional power output by converting the heat stored in the solar cell into useful electric energy through the thermocell. Under illumination with an air mass of 1.5 G, the conversion efficiency of the solar cell can improve from 13.2% to 15% by cooling the solar cell from 61 °C to 34 °C and simultaneously obtaining an additional power of 3.53 μW/cm2 from the thermocell. The advantages of the PV/T module presented in this work, such as the additional power generation from the thermocell as well as the simultaneous cooling of the solar cells and its convenient installation, can lead to the module’s importance in practical and large-scale deployment. Full article
(This article belongs to the Special Issue Active Thermoelectrochemistry)
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10 pages, 1971 KiB  
Article
Scanning Electrochemical Microscopy of Electrically Heated Wire Substrates
by Stefan Wert, Alexander Fußstetter, Christian Iffelsberger and Frank-Michael Matysik
Molecules 2020, 25(5), 1169; https://doi.org/10.3390/molecules25051169 - 5 Mar 2020
Cited by 2 | Viewed by 2878
Abstract
We report a new configuration for enhancing the performance of scanning electrochemical microscopy (SECM) via heating of the substrate electrode. A flattened Pt microwire was employed as the substrate electrode. The substrate was heated by an alternating current (AC), resulting in an increased [...] Read more.
We report a new configuration for enhancing the performance of scanning electrochemical microscopy (SECM) via heating of the substrate electrode. A flattened Pt microwire was employed as the substrate electrode. The substrate was heated by an alternating current (AC), resulting in an increased mass transfer between the wire surface and the bulk solution. The electrochemical response of the Pt wire during heating was investigated by means of cyclic voltammetry (CV). The open circuit potential (OCP) of the wire was recorded over time, while varied heating currents were applied to investigate the time needed for establishing steady-state conditions. Diffusion layer studies were carried out by performing probe approach curves (PACs) for various measuring modes of SECM. Finally, imaging studies of a heated substrate electrode surface, applying feedback, substrate generation/tip collection (SG/TC), and the competition mode of SECM, were performed and compared with room temperature results. Full article
(This article belongs to the Special Issue Active Thermoelectrochemistry)
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