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Complex Impedance Analysis on Charge Accumulation Step of Mn(3)O(4) Nanoparticles during Water Oxidation
[Image: see text] The development of efficient water-oxidizing electrocatalysts is a key issue for achieving high performance in the overall water electrolysis technique. However, the complexity of multiple electron transfer processes and large activation energies have been regarded as major bottlen...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American
Chemical
Society
2021
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8296608/ https://www.ncbi.nlm.nih.gov/pubmed/34308071 http://dx.doi.org/10.1021/acsomega.1c02397 |
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author | Seo, Hongmin Park, Sunghak Cho, Kang Hee Choi, Seungwoo Ko, Changwan Randriamahazaka, Hyacinthe Nam, Ki Tae |
author_facet | Seo, Hongmin Park, Sunghak Cho, Kang Hee Choi, Seungwoo Ko, Changwan Randriamahazaka, Hyacinthe Nam, Ki Tae |
author_sort | Seo, Hongmin |
collection | PubMed |
description | [Image: see text] The development of efficient water-oxidizing electrocatalysts is a key issue for achieving high performance in the overall water electrolysis technique. However, the complexity of multiple electron transfer processes and large activation energies have been regarded as major bottlenecks for efficient water electrolysis. Thus, complete electrochemical processes, including electron transport, charge accumulation, and chemical bond formation/dissociation, need to be analyzed for establishing a design rule for film-type electrocatalysts. In light of this, complex capacitance analysis is an effective tool for investigating the charge accumulation and dissipation processes of film-type electrocatalysts. Here, we conduct complex capacitance analysis for the Mn(3)O(4) nanocatalyst, which exhibits superb catalytic activity for water oxidation under neutral conditions. Charge was accumulated on the catalyst surface by the change in Mn valence between Mn(II) and Mn(IV) prior to the rate-determining O–O bond forming step. Furthermore, we newly propose the dissipation ratio (D) for understanding the energy balance between charge accumulation and charge consumption for chemical O–O bond formation. From this analysis, we reveal the potential- and thickness-dependent contribution of the charge accumulation process on the overall catalytic efficiency. We think that an understanding of complex capacitance analysis could be an effective methodology for investigating the charge accumulation process on the surface of general film-type electrocatalysts. |
format | Online Article Text |
id | pubmed-8296608 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | American
Chemical
Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-82966082021-07-23 Complex Impedance Analysis on Charge Accumulation Step of Mn(3)O(4) Nanoparticles during Water Oxidation Seo, Hongmin Park, Sunghak Cho, Kang Hee Choi, Seungwoo Ko, Changwan Randriamahazaka, Hyacinthe Nam, Ki Tae ACS Omega [Image: see text] The development of efficient water-oxidizing electrocatalysts is a key issue for achieving high performance in the overall water electrolysis technique. However, the complexity of multiple electron transfer processes and large activation energies have been regarded as major bottlenecks for efficient water electrolysis. Thus, complete electrochemical processes, including electron transport, charge accumulation, and chemical bond formation/dissociation, need to be analyzed for establishing a design rule for film-type electrocatalysts. In light of this, complex capacitance analysis is an effective tool for investigating the charge accumulation and dissipation processes of film-type electrocatalysts. Here, we conduct complex capacitance analysis for the Mn(3)O(4) nanocatalyst, which exhibits superb catalytic activity for water oxidation under neutral conditions. Charge was accumulated on the catalyst surface by the change in Mn valence between Mn(II) and Mn(IV) prior to the rate-determining O–O bond forming step. Furthermore, we newly propose the dissipation ratio (D) for understanding the energy balance between charge accumulation and charge consumption for chemical O–O bond formation. From this analysis, we reveal the potential- and thickness-dependent contribution of the charge accumulation process on the overall catalytic efficiency. We think that an understanding of complex capacitance analysis could be an effective methodology for investigating the charge accumulation process on the surface of general film-type electrocatalysts. American Chemical Society 2021-07-06 /pmc/articles/PMC8296608/ /pubmed/34308071 http://dx.doi.org/10.1021/acsomega.1c02397 Text en © 2021 The Authors. Published by American Chemical Society Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Seo, Hongmin Park, Sunghak Cho, Kang Hee Choi, Seungwoo Ko, Changwan Randriamahazaka, Hyacinthe Nam, Ki Tae Complex Impedance Analysis on Charge Accumulation Step of Mn(3)O(4) Nanoparticles during Water Oxidation |
title | Complex Impedance Analysis on Charge Accumulation
Step of Mn(3)O(4) Nanoparticles during Water Oxidation |
title_full | Complex Impedance Analysis on Charge Accumulation
Step of Mn(3)O(4) Nanoparticles during Water Oxidation |
title_fullStr | Complex Impedance Analysis on Charge Accumulation
Step of Mn(3)O(4) Nanoparticles during Water Oxidation |
title_full_unstemmed | Complex Impedance Analysis on Charge Accumulation
Step of Mn(3)O(4) Nanoparticles during Water Oxidation |
title_short | Complex Impedance Analysis on Charge Accumulation
Step of Mn(3)O(4) Nanoparticles during Water Oxidation |
title_sort | complex impedance analysis on charge accumulation
step of mn(3)o(4) nanoparticles during water oxidation |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8296608/ https://www.ncbi.nlm.nih.gov/pubmed/34308071 http://dx.doi.org/10.1021/acsomega.1c02397 |
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