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Catalysts
Special Issues
Materials and Devices for Electrochemical Energy Storage and Conversion
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Materials and Devices for Electrochemical Energy Storage and Conversion

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Electrocatalysis".

Deadline for manuscript submissions: closed (15 August 2023) | Viewed by 5827

Special Issue Editor

Dr. Stefano Trocino

E-Mail Website
Guest Editor
Italian National Research Council, Advanced Energy Technology Institute “Nicola Giordano”, CNR-ITAE, Messina, Italy
Interests: photoelectrolysis; PEM electrolysis; alkaline electrolysis; water splitting; green hydrogen; renewable energy; electrochemical impedance spectroscopy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

EU energy policies indicate the achievement of neutrality in greenhouse gas emissions by 2050 as a long-term strategy. The production of electricity from renewable energy sources is, therefore, a key factor when it comes to heating, transport, and industry; therefore, one has to imagine either the direct use of electricity or the indirect use through the production of e-fuels by electrolysis (e.g., e-hydrogen, methane).

Power-to-X technologies make it possible to transform electricity into synthetic gases (hydrogen, methane, or other gases) and liquids. Hydrogen produced with carbon-free electricity, combined with carbon dioxide (CO2) from sustainable biomass or direct air capture, can be a zero-carbon alternative to natural gas or oil.

This Special Issue deals with the development of materials and devices for electrochemical energy storage and conversion (electrolysis cells, co-electrolysis cells, photoelectrolysis cells, fuel cells, batteries, etc.).

Dr. Stefano Trocino
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. Catalysts 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 2700 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

  • electrolysis
  • co-electrolysis
  • photoelectrolysis
  • water splitting
  • green hydrogen production
  • batteries
  • fuel cells

Published Papers (3 papers)

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Research

14 pages, 3267 KiB  
Article
Ag Sputter-Deposited on MnO2-Carbon Nanotube Nanocomposites as Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media
by Jonas Mart Linge, Heiki Erikson, Peeter Ritslaid, Arvo Kikas, Vambola Kisand, Jaan Aruväli, Jekaterina Kozlova, Aile Tamm, Ave Sarapuu and Kaido Tammeveski
Catalysts 2023, 13(6), 976; https://doi.org/10.3390/catal13060976 - 06 Jun 2023
Viewed by 1372
Abstract
As energy demand increases, new energy conversion methods are also sought. In this study, two MnO2 and multiwalled carbon nanotube (MWCNT) composites were prepared and decorated with silver using magnetron sputtering, to evaluate their electrocatalytic activity towards the oxygen reduction reaction (ORR). [...] Read more.
As energy demand increases, new energy conversion methods are also sought. In this study, two MnO2 and multiwalled carbon nanotube (MWCNT) composites were prepared and decorated with silver using magnetron sputtering, to evaluate their electrocatalytic activity towards the oxygen reduction reaction (ORR). Three nominal thicknesses of Ag layers were used, 5, 10 and 20 nm. The physicochemical characterisation was carried out using scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, as well as X-ray photoelectron spectroscopy. The substrate materials (MnO2-MWCNT) were also investigated by X-ray diffraction analysis. The electrochemical studies of the ORR revealed that the activity and stability of the composite catalysts depend on the substrate material and the Ag layer thickness. Full article
(This article belongs to the Special Issue Materials and Devices for Electrochemical Energy Storage and Conversion)
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13 pages, 3260 KiB  
Article
Investigation of Different Aqueous Electrolytes for Biomass-Derived Activated Carbon-Based Supercapacitors
by Sofia Jeniffer Rajasekaran, Andrews Nirmala Grace, George Jacob, Abdullah Alodhayb, Saravanan Pandiaraj and Vimala Raghavan
Catalysts 2023, 13(2), 286; https://doi.org/10.3390/catal13020286 - 27 Jan 2023
Cited by 10 | Viewed by 2284
Abstract
The present work reports the synthesis of biomass derived activated carbon and its electrochemical behaviour in different electrolytes. Ricinus communis shell (RCS) was used as a raw material in this study for the synthesis of activated carbon (AC) following a high-temperature activation procedure [...] Read more.
The present work reports the synthesis of biomass derived activated carbon and its electrochemical behaviour in different electrolytes. Ricinus communis shell (RCS) was used as a raw material in this study for the synthesis of activated carbon (AC) following a high-temperature activation procedure using potassium hydroxide as the activating agent. The physical and structural characterization of the prepared Ricinus communis shell-derived activated carbon (RCS-AC) was carried by Brunauer-Emmett-Teller analysis, X-ray diffraction analysis, Fourier Transform Infrared Spectroscopy, Raman Spectroscopy and Scanning Electron Microscopy. The synthesized AC was electrochemically characterized using various techniques such as Cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) tests, and Electrochemical impedance spectroscopy (EIS) measurements in different aqueous electrolytes (KOH, H2SO4, and Na2SO4). The results show that the double layer properties of the RCS-AC material in different electrolytes are distinct. In specific, the working electrode tested in 3 M KOH showed excellent electrochemical performance. It demonstrated a specific capacitance of 137 F g−1 (at 1 A g−1 in 3 M KOH) and exhibited high energy and power densities of 18.2 W hkg−1 and 663.4 W kg−1, respectively. The observed capacitance in 3 M KOH remains stable with 97.2% even after 5000 continuous charge and discharge cycles, indicating long-term stability. The study confirmed that the synthesized RCS-derived activated carbon (RCS-AC) exhibits good stability and physicochemical characteristics, making them commercially promising and appropriate for energy storage applications. Full article
(This article belongs to the Special Issue Materials and Devices for Electrochemical Energy Storage and Conversion)
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17 pages, 8596 KiB  
Article
Binder-Free Supercapacitors Based on Thin Films of MWCNT/GO Nanohybrids: Computational and Experimental Analysis
by Sandeep Pandey, Mayank Pathak, Manoj Karakoti, Gaurav Tatrari, Boddepalli Shantibhusan, Pawan Singh Dhapola, Sunil Dhali, Anurag Srivastava, Sravendra Rana and Nanda Gopal Sahoo
Catalysts 2023, 13(2), 235; https://doi.org/10.3390/catal13020235 - 19 Jan 2023
Cited by 3 | Viewed by 1691
Abstract
This work reports an innovative approach to the fabrication of free-standing thin films of multiwalled carbon nanotubes (MWCNTs)/graphene oxide (GO) nanohybrids by using dimethyl formamide (DMF) and n-hexane as a solvent–antisolvent system for the growth of thin films of MWCNTs/GO nanohybrids. The synthesis [...] Read more.
This work reports an innovative approach to the fabrication of free-standing thin films of multiwalled carbon nanotubes (MWCNTs)/graphene oxide (GO) nanohybrids by using dimethyl formamide (DMF) and n-hexane as a solvent–antisolvent system for the growth of thin films of MWCNTs/GO nanohybrids. The synthesis of the GO was carried out by using the modified Hummers method, while the synthesis of MWCNTs/GO nanohybrids was done by the intermixing of the carboxylic acid functionalized MWCNT and GO using the solution-mixing method. The growth of the thin film of MWCNTs/GO nanohybrids was done by obeying the surface-tension-driven phenomena which occur mainly due to the coalescence of bubbles due to the solvent–antisolvent interfacial tension. Furthermore, density functional theory (DFT)-based first-principles simulations were performed to understand the structural, electronic, and capacitive aspects of MWCNT/GO nanohybrids. The computational results demonstrated excellent quantum capacitance in the MWCNT/GO nanohybrid electrodes. Inspired by the computational results, the same process elaborated above has also been employed to develop binder-free supercapacitor devices utilizing the MWCNT/GO nanohybrid as an electrode material. The electrochemical performance of this electrode in 1 M aqueous H2SO4 demonstrates a good energy density of 21.63 WhKg−1 at a current density of 0.5 Ag−1, with a high specific capacitance of 369.01 F/g at the scan rate of 2 mVs−1 and excellent cyclic stability of 97% for 5000 charge–discharge cycles. Full article
(This article belongs to the Special Issue Materials and Devices for Electrochemical Energy Storage and Conversion)
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