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Micromachines
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Porous Materials for Water Splitting and Supercapacitors
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Porous Materials for Water Splitting and Supercapacitors

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

Deadline for manuscript submissions: 30 July 2024 | Viewed by 2416

Special Issue Editor

Dr. Pei-Hsin (Christine) Young

E-Mail Website
Guest Editor
Department of Chemical and Materials Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan
Interests: porous materials; MOFs; supercapacitors; batteries; water splitting
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The energy crisis and rapid global pollution are significant challenges worldwide. The proliferation of modern industries has led to a substantial increase in the demand for energy due to the extensive growth of electronic devices. To address these issues, renewable energy and electrochemical energy conversion have emerged as highly effective technologies for energy storage. Hydrogen, known for its high energy density, is a promising energy source, and one method of producing it is through electrochemical water splitting using electrocatalysts. Supercapacitors are widely utilized for electrical energy storage and have garnered significant attention due to their exceptional advantages, including remarkable rate capabilities, high power densities, and long cycling lifetimes.

The employed electrocatalysts and electrode materials play crucial roles in facilitating improved electrochemical reactions. Porous materials possess high surface areas and porosities, making them particularly appealing. Factors such as pore size distribution, pore size, and pore connectivity significantly impact the architecture and microstructure of porous materials, thereby influencing their electrochemical performance. Consequently, the development of novel high-performance porous materials for electrodes is of utmost importance.

This Special Issue of Micromachines aims to explore the theme of "Porous Materials for Water Splitting and Supercapacitors." It will cover advancements in the design and development of porous materials, encompassing porous carbons, MOFs, COFs, transition metal oxides/sulfides, and other related materials.

Dr. Pei-Hsin (Christine) Young
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

  • porous materials
  • supercapacitors
  • electrode materials
  • carbon material
  • transition metal oxides/sulfides

Published Papers (2 papers)

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Research

15 pages, 3196 KiB  
Article
Synergistic Charge Storage Enhancement in Supercapacitors via Ti3C2Tx MXene and CoMoO4 Nanoparticles
by Christine Young, An-Yi Wu and Ri-Yu Li
Micromachines 2024, 15(2), 234; https://doi.org/10.3390/mi15020234 - 01 Feb 2024
Viewed by 761
Abstract
MXene has emerged as a highly promising two-dimensional (2D) layered material with inherent advantages as an electrode material, such as a high electrical conductivity and spacious layer distances conducive to efficient ion transport. Despite these merits, the practical implementation faces challenges due to [...] Read more.
MXene has emerged as a highly promising two-dimensional (2D) layered material with inherent advantages as an electrode material, such as a high electrical conductivity and spacious layer distances conducive to efficient ion transport. Despite these merits, the practical implementation faces challenges due to MXene’s low theoretical capacitance and issues related to restacking. In order to overcome these limitations, we undertook a strategic approach by integrating Ti3C2Tx MXene with cobalt molybdate (CoMoO4) nanoparticles. The CoMoO4 nanoparticles bring to the table rich redox activity, high theoretical capacitance, and exceptional catalytic properties. Employing a facile hydrothermal method, we synthesized CoMoO4/Ti3C2Tx heterostructures, leveraging urea as a size-controlling agent for the CoMoO4 precursors. This innovative heterostructure design utilizes Ti3C2Tx MXene as a spacer, effectively mitigating excessive agglomeration, while CoMoO4 contributes its enhanced redox reaction capabilities. The resulting CoMoO4/Ti3C2Tx MXene hybrid material exhibited 698 F g−1 at a scan rate of 5 mV s−1, surpassing that of the individual pristine Ti3C2Tx MXene (1.7 F g−1) and CoMoO4 materials (501 F g−1). This integration presents a promising avenue for optimizing MXene-based electrode materials, addressing challenges and unlocking their full potential in various applications. Full article
(This article belongs to the Special Issue Porous Materials for Water Splitting and Supercapacitors)
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18 pages, 10703 KiB  
Article
Ultrafast Fabrication of H2SO4, LiCl, and Li2SO4 Gel Electrolyte Supercapacitors with Reduced Graphene Oxide (rGO)-LiMnOx Electrodes Processed Using Atmospheric-Pressure Plasma Jet
by Pei-Ling Lan, I-Chih Ni, Chih-I Wu, Cheng-Che Hsu, I-Chun Cheng and Jian-Zhang Chen
Micromachines 2023, 14(9), 1701; https://doi.org/10.3390/mi14091701 - 30 Aug 2023
Viewed by 1443
Abstract
Pastes containing reduced graphene oxide (rGO) and LiCl-Mn(NO3)2·4H2O are screen-printed on a carbon cloth substrate and then calcined using a nitrogen atmospheric-pressure plasma jet (APPJ) for conversion into rGO-LiMnOx nanocomposites. The APPJ processing time is within [...] Read more.
Pastes containing reduced graphene oxide (rGO) and LiCl-Mn(NO3)2·4H2O are screen-printed on a carbon cloth substrate and then calcined using a nitrogen atmospheric-pressure plasma jet (APPJ) for conversion into rGO-LiMnOx nanocomposites. The APPJ processing time is within 300 s. RGO-LiMnOx on carbon cloth is used to sandwich H2SO4, LiCl, or Li2SO4 gel electrolytes to form hybrid supercapacitors (HSCs). The areal capacitance, energy density, and cycling stability of the HSCs are evaluated using electrochemical measurement. The HSC utilizing the Li2SO4 gel electrolyte exhibits enhanced electrode–electrolyte interface reactions and increased effective surface area due to its high pseudocapacitance (PC) ratio and lithium ion migration rate. As a result, it demonstrates the highest areal capacitance and energy density. The coupling of charges generated by embedded lithium ions with the electric double-layer capacitance (EDLC) further contributed to the significant overall capacitance enhancement. Conversely, the HSC with the H2SO4 gel electrolyte exhibits better cycling stability. Our findings shed light on the interplay between gel electrolytes and electrode materials, offering insights into the design and optimization of high-performance HSCs. Full article
(This article belongs to the Special Issue Porous Materials for Water Splitting and Supercapacitors)
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