English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/218145
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:

Title

Understanding the effects of different microstructural contributions in the electrochemical response of Nickel-based semiconductor electrodes with 3D hierarchical networks shapes

AuthorsYus, Joaquín; Ferrari-Fernández, Begoña ; Sánchez Herencia, Antonio Javier; González Granados, Zoilo
KeywordsSupercapacitors
Battery-like electrode behavior
Semiconductor
Microstructural contributions
Charge transfer resistance
Issue Date2020
PublisherElsevier
CitationELECTROCHIMICA ACTA 335 (2020)
Abstract[EN] It is well known that exposed surface area, nanoparticles connectivity and its consolidation level in a nanostructure are key points in the enhancement of the electrochemical performance in energy storage devices. The design and optimization of different electrodes with specific microarchitectures (based on the arrangement manipulation of NiO nanoplatelets, used as building blocks), has allowed distinguishing the effects of each microstructural contribution in their final electrochemical responses, overpassing thermal and mechanical mismatches between the semiconductor ceramic structure and the metallic collector. In all cases, the same electroactive material and the same coating technique were used, preventing the interference of secondary phenomena in the EIS studies, and allowing argue over the contribution of the microstructural features incorporated to the electrode (nature and shape of the collector, degree of sintering and consolidation of the ceramic microstructure, incorporation of non-noble metallic nanoparticles and the macro/meso/microposity effect) in the effective profiting of the Faradaic phenomena observed during their cycling. The modification of the Ni-based electrodes allows understanding how microstructural features infer the electron transport and the ion diffusion through the consolidated structure. The EIS analysis proves that the design of the porous hierarchical network of our semiconductors electrodes resulted in a good rate capability (with capacitance values of 1000 F g¿1 or 500 C g¿1), exhibiting a relaxation time constant (¿0 = 18 ms), while a slight increase of the charge-transfer resistance (Rct = 3.65¿) is negligible if the exposed surface is high enough to maintain a high ion transport. The inclusion of non-noble nanoparticles, such as Ni NPs, in the NiO semiconductor microstructure and the optimum deposited mass and sintering treatment create a metal-ceramic electrode that enhances both the charge transfer resistance (1.55 ¿) showing relaxation time in the range (¿0 = 11 ms) and maintaining an excellent capacitive behavior (750 F g¿1 or 375C g¿1) at quick charge/discharge rate.
Publisher version (URL)http://dx.doi.org/10.1016/j.electacta.2020.135629
URIhttp://hdl.handle.net/10261/218145
DOI10.1016/j.electacta.2020.135629
Identifiersdoi: 10.1016/j.electacta.2020.135629
e-issn: 1873-3859
issn: 0013-4686
Appears in Collections:(ICV) Artículos
Files in This Item:
File Description SizeFormat 
Yus_understanding_Electrochimica_2020_postprint.pdf Embargoed until January 7, 20221,42 MBAdobe PDFThumbnail
View/Open    Request a copy
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.