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Iron (II/III) perchlorate electrolytes for electrochemically harvesting low-grade thermal energy

Remarkable advances have recently been made in the thermocell array with series or parallel interconnection, however, the output power from the thermocell array is mainly limited by the electrolyte performance of an n-type element. In this work, we investigate iron (II/III) perchlorate electrolytes...

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Autores principales: Kim, Ju Hyeon, Lee, Ju Hwan, Palem, Ramasubba Reddy, Suh, Min-Soo, Lee, Hong H., Kang, Tae June
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6582052/
https://www.ncbi.nlm.nih.gov/pubmed/31213633
http://dx.doi.org/10.1038/s41598-019-45127-w
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author Kim, Ju Hyeon
Lee, Ju Hwan
Palem, Ramasubba Reddy
Suh, Min-Soo
Lee, Hong H.
Kang, Tae June
author_facet Kim, Ju Hyeon
Lee, Ju Hwan
Palem, Ramasubba Reddy
Suh, Min-Soo
Lee, Hong H.
Kang, Tae June
author_sort Kim, Ju Hyeon
collection PubMed
description Remarkable advances have recently been made in the thermocell array with series or parallel interconnection, however, the output power from the thermocell array is mainly limited by the electrolyte performance of an n-type element. In this work, we investigate iron (II/III) perchlorate electrolytes as a new n-type electrolyte and compared with the ferric/ferrous cyanide electrolyte at its introduction with platinum as the electrodes, which has been the benchmark for thermocells. In comparison, the perchlorate electrolyte (Fe(2+)/Fe(3+)) exhibits a high temperature coefficient of redox potential of +1.76 mV/K, which is complementary to the cyanide electrolyte (Fe(CN)(6)(3−)/Fe(CN)(6)(4−)) with the temperature coefficient of −1.42 mV/K. The power factor and figure of merit for the electrolyte are higher by 28% and 40%, respectively, than those for the cyanide electrolyte. In terms of device performance, the thermocell using the perchlorate electrolyte provides a power density of 687 mW/m(2) that is 45% higher compared to the same device but with the cyanide electrolyte for a small temperature difference of 20 °C. The advent of this high performance n-type electrolyte could open up new ways to achieve substantial advances in p-n thermocells as in p-n thermoelectrics, which has steered the way to the possibility of practical use of thermoelectrics.
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spelling pubmed-65820522019-06-26 Iron (II/III) perchlorate electrolytes for electrochemically harvesting low-grade thermal energy Kim, Ju Hyeon Lee, Ju Hwan Palem, Ramasubba Reddy Suh, Min-Soo Lee, Hong H. Kang, Tae June Sci Rep Article Remarkable advances have recently been made in the thermocell array with series or parallel interconnection, however, the output power from the thermocell array is mainly limited by the electrolyte performance of an n-type element. In this work, we investigate iron (II/III) perchlorate electrolytes as a new n-type electrolyte and compared with the ferric/ferrous cyanide electrolyte at its introduction with platinum as the electrodes, which has been the benchmark for thermocells. In comparison, the perchlorate electrolyte (Fe(2+)/Fe(3+)) exhibits a high temperature coefficient of redox potential of +1.76 mV/K, which is complementary to the cyanide electrolyte (Fe(CN)(6)(3−)/Fe(CN)(6)(4−)) with the temperature coefficient of −1.42 mV/K. The power factor and figure of merit for the electrolyte are higher by 28% and 40%, respectively, than those for the cyanide electrolyte. In terms of device performance, the thermocell using the perchlorate electrolyte provides a power density of 687 mW/m(2) that is 45% higher compared to the same device but with the cyanide electrolyte for a small temperature difference of 20 °C. The advent of this high performance n-type electrolyte could open up new ways to achieve substantial advances in p-n thermocells as in p-n thermoelectrics, which has steered the way to the possibility of practical use of thermoelectrics. Nature Publishing Group UK 2019-06-18 /pmc/articles/PMC6582052/ /pubmed/31213633 http://dx.doi.org/10.1038/s41598-019-45127-w Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Kim, Ju Hyeon
Lee, Ju Hwan
Palem, Ramasubba Reddy
Suh, Min-Soo
Lee, Hong H.
Kang, Tae June
Iron (II/III) perchlorate electrolytes for electrochemically harvesting low-grade thermal energy
title Iron (II/III) perchlorate electrolytes for electrochemically harvesting low-grade thermal energy
title_full Iron (II/III) perchlorate electrolytes for electrochemically harvesting low-grade thermal energy
title_fullStr Iron (II/III) perchlorate electrolytes for electrochemically harvesting low-grade thermal energy
title_full_unstemmed Iron (II/III) perchlorate electrolytes for electrochemically harvesting low-grade thermal energy
title_short Iron (II/III) perchlorate electrolytes for electrochemically harvesting low-grade thermal energy
title_sort iron (ii/iii) perchlorate electrolytes for electrochemically harvesting low-grade thermal energy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6582052/
https://www.ncbi.nlm.nih.gov/pubmed/31213633
http://dx.doi.org/10.1038/s41598-019-45127-w
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