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Oxide-Based Materials for Energy Storage and Conversion

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Energy Materials".

Deadline for manuscript submissions: closed (20 January 2022) | Viewed by 6082

Special Issue Editor

Department of Inorganic Chemistry, University of Malaga, Malaga, Spain
Interests: solid oxide fuel cells; hydrogen separation membranes; electrode; electrolyte; Rietveld analysis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The continuous growth of the human population, and its concomitant energy demand, is pushing the world to the brink of an environmental disaster. Therefore, there is an increasing need for advanced materials in order to generate energy from renewable sources and its storage and improve the conversion from fossil fuels.

Among these materials, oxide-based materials are widely used due their broad range of compositions, structures, and tunability, where the same frameworks with different cations have completely different applications.

This Special Issue will focus on oxide-based materials applied to:

  • Fuel cells;
  • Hydrogen generation and conversion;
  • Hydrogen storage;
  • Solar energy conversion;
  • Batteries;
  • Capacitors

High-quality articles dealing with these topics are welcome.

Dr. Jose Manuel Porras-Vazquez
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Energy storage
  • Conversion
  • Fuel cell
  • Hydrogen
  • Solar energy
  • Batteries
  • Oxides
  • Fluorite
  • Perovskite

Published Papers (2 papers)

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Research

8 pages, 1936 KiB  
Article
Densification of a NASICON-Type LATP Electrolyte Sheet by a Cold-Sintering Process
by Naoki Hamao, Yuki Yamaguchi and Koichi Hamamoto
Materials 2021, 14(16), 4737; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14164737 - 22 Aug 2021
Cited by 24 | Viewed by 3468
Abstract
A NASICON-type Li1.3Al0.3Ti1.7(PO4)3 (LATP) electrolyte sheet for all-solid-state batteries was fabricated by a cold sintering process (CSP). The microstructure of the LATP sheet was controlled to improve the wettability which is an essential factor [...] Read more.
A NASICON-type Li1.3Al0.3Ti1.7(PO4)3 (LATP) electrolyte sheet for all-solid-state batteries was fabricated by a cold sintering process (CSP). The microstructure of the LATP sheet was controlled to improve the wettability which is an essential factor in CSP. The porous sheets of LATP were prepared by calcination the green sheets to remove the organic components and form the porous structure. By the CSP using the porous sheets, the densification of grain boundary was observed and further densified with increasing reaction time. The total conductivity of the prepared LATP sheet was improved from 3.0 × 10−6 S/cm to 3.0 × 10−4 S/cm due to the formation of necks between the particles at the grain boundary. Full article
(This article belongs to the Special Issue Oxide-Based Materials for Energy Storage and Conversion)
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13 pages, 9283 KiB  
Article
Dielectric Response and Structural Analysis of (A3+, Nb5+) Cosubstituted CaCu3Ti4O12 Ceramics (A: Al and Bi)
by Hicham Mahfoz Kotb, Mohamad M. Ahmad, Adil Alshoaibi and Koji Yamada
Materials 2020, 13(24), 5822; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13245822 - 21 Dec 2020
Cited by 9 | Viewed by 2150
Abstract
CaCu3Ti4-x((A0.05Nb0.05))xO12 ceramics (A: Al and Bi; x = 0, 0.3) were synthesized by high-energy mechanical ball milling and reactive sintering at 1050 °C in air. Rietveld refinement of XRD data revealed the [...] Read more.
CaCu3Ti4-x((A0.05Nb0.05))xO12 ceramics (A: Al and Bi; x = 0, 0.3) were synthesized by high-energy mechanical ball milling and reactive sintering at 1050 °C in air. Rietveld refinement of XRD data revealed the pure and (Al3+, Nb5+) cosubstituted ceramics contained a minor CuO secondary phase with a mole fraction of about 3.2% and 6.9%, respectively, along with a CaCu3Ti4O12 (CCTO)-like cubic structure. In addition, (Bi3+, Nb5+) cosubstituted ceramics had a pyrochlore (Ca2(Ti, Nb)2O7) secondary phase of about 18%. While the (Al3+, Nb5+) cosubstituted CCTO showed the highest relative permittivity (ε’ = 3.9 × 104), pure CCTO showed the lowest dielectric loss (tanδ = 0.023) at 1 kHz and 300 K. Impedance-spectroscopy (IS) measurements showed an electrically heterogeneous structure for the studied ceramics, where a semiconducting grain was surrounded by highly resistive grain boundary. The giant relative permittivity of the ceramics was attributed to the Maxwell–Wagner polarization effect at the blocking grain boundaries and domain boundaries. The higher tanδ of the cosubstituted samples was correlated with their lower grain boundary’s resistivity, as confirmed by IS analysis. Modulus-spectrum analysis revealed two relaxation processes for the pure and (Bi3+, Nb5+) cosubstituted CCTO samples. Dissimilar behavior was observed for the (Al3+, Nb5+) cosubstituted CCTO, where three relaxation mechanisms were observed and attributed to the grain, domain-boundary, and grain-boundary responses. Full article
(This article belongs to the Special Issue Oxide-Based Materials for Energy Storage and Conversion)
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