From medium- to high-entropy hydroxides for hybrid supercapacitors: a review

The quest for devices with significantly higher power and energy density has made hybrid supercapacitors a promising alternative for energy storage. These devices have gained traction by combining the exceptional power density of supercapacitive materials with the high energy density of battery-type...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2024-11, Vol.12 (43), p.2942-29431
Main Authors: Palm, Rasmus, Baena-Moncada, Angélica María, Gonçalves, Josué M
Format: Article
Language:English
Subjects:
Alternative energy sources
Electrode materials
Energy storage
Entropy
Hydroxides
Reviews
Structure-function relationships
Supercapacitors
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Summary:The quest for devices with significantly higher power and energy density has made hybrid supercapacitors a promising alternative for energy storage. These devices have gained traction by combining the exceptional power density of supercapacitive materials with the high energy density of battery-type materials in a single system. Among promising battery-type materials, medium-entropy and high-entropy hydroxides (ME-hydroxides/HE-hydroxides) have attracted growing research interest due to their unique structural characteristics and their potential for tailoring functional properties. This new class of materials represents a significant departure from the traditional concept of low-entropy materials, paving the way for innovative advancements in energy storage technologies. Considering the significant advancements in the past five years, this review focuses on the recently developed ME- and HE-hydroxides for hybrid supercapacitors. It covers their synthesis methods, effective strategies, promising trends, and performance as positive electrode materials. Additionally, the review addresses the inappropriate use of the term "high-entropy". Finally, the challenges and prospects in designing ME- and HE-hydroxides for hybrid supercapacitors are discussed, offering guidance for the development of new materials to advance future energy storage technologies. This review highlights the recent progress of medium-entropy and high-entropy hydroxides for hybrid supercapacitors. Key synthesis methods and strategies are discussed. Challenges and prospects for these materials are also addressed.
ISSN:2050-7488
2050-7496
DOI:10.1039/d4ta05625f