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Micromachines
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Micro Supercapacitors for Energy Storage and Power Management
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Micro Supercapacitors for Energy Storage and Power Management

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "C：Chemistry".

Deadline for manuscript submissions: closed (20 March 2024) | Viewed by 5279

Special Issue Editor

Dr. Sixing Xu

E-Mail Website
Guest Editor
College of Semiconductors (College of Integrated Circuits), Hunan University, Changsha 410082, China
Interests: micro supercapacitors; microelectromechanical systems (MEMS); microsystem; electrochemistry; miniaturization; wafer level; integration

Special Issue Information

Dear Colleagues,

The boom of wearable and implantable electronics requires the system to be more integrated and functional, which places higher demands for the miniaturization and integration of all circuit elements. Unfortunately, large-volume electrolytic capacitors, widely used for energy storage and power signal filtering, have been among the bulkiest and most un-integratable elements that restrict the applications of various necessary modules in miniaturized electronics. As the most promising substitute, electrochemical supercapacitors shall provide comparable capacity much more compactly thanks to interface adsorptions or Faradic reactions with orders of magnitude higher charge storage efficiency. Therefore, over the past decade, there has been great interest in the miniaturization of supercapacitors (termed micro supercapacitors) and their applications in integrated systems.

This Special Issue aims to bring together contributions that could accelerate the applications of miniaturized supercapacitors into microsystems. I am very pleased to invite you to submit your original research or review articles to the Special Issue on “Micro Supercapacitors for Energy Storage and Power Management” in Micromachines. This Special Issue may include (but is not limited to) the following leading-edge aspects in the field of micro supercapacitors:

  • Basics and fundamental theories;
  • Novel materials, with micro-scale device demonstration;
  • High-performance devices for energy storage or power management;
  • Wafer-level fabrication and encapsulation techniques;
  • Heterogenous integration methods with other electronics;
  • Novel applications in microsystems.

I look forward to receiving your valuable contributions.

Dr. Sixing Xu
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.

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. Micromachines is an international peer-reviewed open access monthly 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

  • micro supercapacitors
  • microelectromechanical systems (MEMS)
  • microsystem
  • electrochemistry
  • miniaturization
  • wafer level
  • integration

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Published Papers (3 papers)

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Research

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8 pages, 2580 KiB  
Communication
Experimental Investigation of Electrochemical Capacitive Responses versus Pore Geometries through Artificial Nanotubes
by Jianyou Dai, Minghao Xu, Zhangshanhao Li, Shuoxiang Liu, Yuyao Wang, Lei Shan, Xiaohong Wang and Sixing Xu
Micromachines 2023, 14(10), 1909; https://doi.org/10.3390/mi14101909 - 7 Oct 2023
Viewed by 1175
Abstract
Electrochemical supercapacitors have attracted significant attention due to their large capacity, high-power output, and long cycle life. However, despite extensive studies and advancements in developing highly porous electrode materials, little quantitative research on the impact of pore geometry on electrochemical responses has been [...] Read more.
Electrochemical supercapacitors have attracted significant attention due to their large capacity, high-power output, and long cycle life. However, despite extensive studies and advancements in developing highly porous electrode materials, little quantitative research on the impact of pore geometry on electrochemical responses has been conducted. This paper presents the first quantitative investigation of the relationship between electrochemical capacitive responses and pore geometries at the nanoscale. To achieve this, we constructed a uniform cylindrical pore array with controllable pore diameter and depth by using anodized aluminum oxide (AAO) to serve as a template and atomic layer deposition (ALD) technology for TiN conductive layer decoration. Our findings reveal that, at the nanoscale, increasing the specific surface area through pore diameter and depth does not proportionally increase the capacitive response, even at low scan rates. Meanwhile, we observe a critical pore parameter (170/5000 nm, diameter/depth), where the specific capacitance density and characteristic frequency dramatically decrease with a further increase in the pore aspect ratio. These results indicate that blindly pursuing the absolute specific surface area of the electrode material is not advisable. Instead, optimal pore geometry should be designed based on the desired operational conditions, and this work may serve as valuable guidance. Full article
(This article belongs to the Special Issue Micro Supercapacitors for Energy Storage and Power Management)
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9 pages, 12190 KiB  
Article
3D Framework Carbon for High-Performance Zinc-Ion Capacitors
by Setthathon Kiatikajornjumroen, Xiaopeng Liu, Yinan Lu and Buddha Deka Boruah
Micromachines 2023, 14(7), 1476; https://doi.org/10.3390/mi14071476 - 23 Jul 2023
Viewed by 1699
Abstract
Given the rapid progress and widespread adoption of advanced energy storage devices, there has been a growing interest in aqueous capacitors that offer non-flammable properties and high safety standards. Consequently, extensive research efforts have been dedicated to investigating zinc anodes and low-cost carbonaceous [...] Read more.
Given the rapid progress and widespread adoption of advanced energy storage devices, there has been a growing interest in aqueous capacitors that offer non-flammable properties and high safety standards. Consequently, extensive research efforts have been dedicated to investigating zinc anodes and low-cost carbonaceous cathode materials. Despite these efforts, the development of high-performance zinc-ion capacitors (ZICs) still faces challenges, such as limited cycling stability and low energy densities. In this study, we present a novel approach to address these challenges. We introduce a three-dimensional (3D) conductive porous carbon framework cathode combined with zinc anode cells, which exhibit exceptional stability and durability in ZICs. Our experimental results reveal remarkable cycling performance, with a capacity retention of approximately 97.3% and a coulombic efficiency of nearly 100% even after 10,000 charge–discharge cycles. These findings represent significant progress in improving the performance of ZICs. Full article
(This article belongs to the Special Issue Micro Supercapacitors for Energy Storage and Power Management)
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Review

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16 pages, 2250 KiB  
Review
How Practical Are Fiber Supercapacitors for Wearable Energy Storage Applications?
by Parya Teymoory, Jingzhou Zhao and Caiwei Shen
Micromachines 2023, 14(6), 1249; https://doi.org/10.3390/mi14061249 - 14 Jun 2023
Cited by 5 | Viewed by 1939
Abstract
Future wearable electronics and smart textiles face a major challenge in the development of energy storage devices that are high-performing while still being flexible, lightweight, and safe. Fiber supercapacitors are one of the most promising energy storage technologies for such applications due to [...] Read more.
Future wearable electronics and smart textiles face a major challenge in the development of energy storage devices that are high-performing while still being flexible, lightweight, and safe. Fiber supercapacitors are one of the most promising energy storage technologies for such applications due to their excellent electrochemical characteristics and mechanical flexibility. Over the past decade, researchers have put in tremendous effort and made significant progress on fiber supercapacitors. It is now the time to assess the outcomes to ensure that this kind of energy storage device will be practical for future wearable electronics and smart textiles. While the materials, fabrication methods, and energy storage performance of fiber supercapacitors have been summarized and evaluated in many previous publications, this review paper focuses on two practical questions: Are the reported devices providing sufficient energy and power densities to wearable electronics? Are the reported devices flexible and durable enough to be integrated into smart textiles? To answer the first question, we not only review the electrochemical performance of the reported fiber supercapacitors but also compare them to the power needs of a variety of commercial electronics. To answer the second question, we review the general approaches to assess the flexibility of wearable textiles and suggest standard methods to evaluate the mechanical flexibility and stability of fiber supercapacitors for future studies. Lastly, this article summarizes the challenges for the practical application of fiber supercapacitors and proposes possible solutions. Full article
(This article belongs to the Special Issue Micro Supercapacitors for Energy Storage and Power Management)
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