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Highly Efficient Technologies for the Energy Transition

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "B: Energy and Environment".

Deadline for manuscript submissions: 15 April 2026 | Viewed by 1028

Special Issue Editors


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Guest Editor
1. Department of Architecture, Construction and Design, Polytechnic University of Bari, Via Orabona 4, 70125 Bari, Italy
2. National Research Council, Institute of Nanotechnology (CNR-NANOTEC), Via Monteroni, 73100 Lecce, Italy
Interests: building integration of innovative technologies; energy saving; building energy
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Department of Architecture, Construction and Design, Polytechnic University of Bari, Via Orabona 4, 70125 Bari, Italy
Interests: energy saving; solar energy; wind energy; FEM simulation; acoustics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nowadays, high-performance technologies are more and more required to achieve the compelling goals of reducing greenhouse gas emissions, harvesting clean energy and saving energy by means of innovative materials and technologies. These points indeed represent a pivotal challenge for researchers, within the framework of this epochal energy transition. In this intriguing roadmap, passive and active technologies for HVAC systems will play a very relevant role: smart materials and novel devices will provide exciting performances and properties and disclose unexplored potentials, offering the chance to enhance design opportunities and attainable energy saving, both during fabrication and operation. 

It is our pleasure to invite you to contribute to this Special Issue with your valuable manuscripts, sending full papers, reviews, and communications dealing with the design, characterization, and modelling of smart materials and devices for energy saving, for a very wide readership.

Here is a non-exhaustive list of the main topics proposed for this Special Issue: 

  • Energy harvesting and saving;
  • Heat pumps, heat transfer, thermal storage, and phase change materials;
  • Chromogenics;
  • Modelling and simulation of smart materials;
  • Radiative cooling;
  • Properties and characterization of smart materials and devices for HVAC.

Dr. Alessandro Cannavale
Prof. Dr. Ubaldo Ayr
Guest Editors

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 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

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 harvesting and saving
  • heat pumps
  • heat transfer
  • thermal storage
  • cooling
  • HVAC systems

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Published Papers (1 paper)

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Research

16 pages, 2091 KB  
Article
Use of a Cobalt-Based Redox Electrolyte in Hybrid Electrochromic Devices
by Eleftheria Merkoulidi and George Syrrokostas
Energies 2026, 19(1), 68; https://doi.org/10.3390/en19010068 - 23 Dec 2025
Viewed by 245
Abstract
In the present study, highly transparent evaporated tungsten oxide films with improved charge storage properties were used in battery-like (b-ECDs) and hybrid electrochromic devices (h-ECDs). A Co2+/3+ redox couple was added to the electrolyte as an alternative to other redox couples that [...] Read more.
In the present study, highly transparent evaporated tungsten oxide films with improved charge storage properties were used in battery-like (b-ECDs) and hybrid electrochromic devices (h-ECDs). A Co2+/3+ redox couple was added to the electrolyte as an alternative to other redox couples that have been already used in h-ECDs. The as-prepared h-ECDs, colored homogeneously, exhibited a contrast ratio of up to 7:1 in the visible spectrum, at a cathodic voltage of −2.5 V for only 10 s, compared to 3.5:1 at a cathodic voltage of −3 V for 180 s for a b-ECD. Moreover, when the redox couple was present in the electrolyte, almost a 50% higher areal capacitance and a 55% lower charge transfer resistance at the electrochromic layer/electrolyte interface were achieved. Also, the results show that the optical performance depends strongly on the coloration procedure (potentiostatic or galvanostatic), that self-bleaching is not so intense, and especially that the energy density consumed during bleaching is reduced in the presence of the redox couple. Overall, the findings of this study highlight the benefits of using a cobalt redox electrolyte in h-ECDs, allowing a direct comparison with b-ECDs, to dynamically control incoming solar irradiation in a building, thus improving buildings’ energy efficiency. Full article
(This article belongs to the Special Issue Highly Efficient Technologies for the Energy Transition)
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