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Catalysts
Special Issues
Photo- and Electro-Catalysis of Nanomaterials for Energy Conversion and Storage
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Photo- and Electro-Catalysis of Nanomaterials for Energy Conversion and Storage

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

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 18078

Special Issue Editors

Dr. Hee-chae Choi

E-Mail Website
Guest Editor
Theoretical Materials & Chemistry Group, Institute of Inorganic Chemistry, University of Cologne, Greinstr. 6, 50939 Cologne, Germany
Interests: density functional theory; catalysis mechanism; solid state physics; solar energy conversion
Dr. So-Hye Cho

E-Mail Website
Guest Editor
Materials Architecturing Research Center, Korea Institute of Science & Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Korea
Interests: Nanomaterials; Photocatalysts, Heterogeneous catalysts; Catalyst Synthesis and Characterization; Porous Materials; Catalytic Filtration Materials

Special Issue Information

Dear Colleagues,

Photo- and electro-catalysis are regarded as promising methods of eco-friendly and sustainable energy conversion and storage. Nanomaterials especially show a number of amazing and unexpected phenomena which have never been observed in bulky materials. As many research groups have reported interesting and excellent photo- and electro-catalytic material performances and physics in performance recently, we would like to take this opportunity to gather works with focused and narrowed topics in a Special Issue.

This Special Issue aims to cover research on photo- and electro-catalysis of nanomaterials especially with following topics:

  1. Water splitting and hydrogen energy production
  2. Nitrogen reduction reaction
  3. CO2 conversion
  4. Metal-air battery
  5. Catalysis mechanism
  6. Modeling, simulations, and theory

Dr. Hee-chae Choi
Dr. So-Hye Cho
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 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

  • Photocatalyst
  • Electrocatalyst
  • Metal-air battery
  • Nanomaterials
  • Density functional theory
  • Molecular dynamics
  • Modeling

Published Papers (4 papers)

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Research

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12 pages, 4225 KiB  
Article
ZnO/ZnS-Polyvinyl Alcohol Hydrogel for Photocatalytic H2-Generation
by Valeriia Poliukhova, Wenwei Lei, Sovann Khan, Eunju Lee Tae, Norihiro Suzuki, Chiaki Terashima, Akira Fujishima, Ken-Ichi Katsumata and So-Hye Cho
Catalysts 2022, 12(3), 272; https://0-doi-org.brum.beds.ac.uk/10.3390/catal12030272 - 28 Feb 2022
Cited by 12 | Viewed by 3448
Abstract
The separation of nanoparticles from a solution-based photocatalytic reaction is a significant problem in practical applications. To address the issue, we developed a new photocatalyst composite based on ZnO-ZnS heterojunction (ZnOS) embedded in polyvinyl alcohol (PVA) hydrogel, which showed satisfactory results for photocatalyst [...] Read more.
The separation of nanoparticles from a solution-based photocatalytic reaction is a significant problem in practical applications. To address the issue, we developed a new photocatalyst composite based on ZnO-ZnS heterojunction (ZnOS) embedded in polyvinyl alcohol (PVA) hydrogel, which showed satisfactory results for photocatalyst recycling. PVA-ZnOS composite hydrogel was fabricated by freezing-induced gelation, which enabled the encapsulation of ZnOS nanoparticles into polymeric matrices. PVA hydrogel served as a promising candidate in photocatalytic applications due to its excellent properties such as high transparency, porosity, hydrophilicity, and stability under ultraviolet (UV) light. PVA-ZnOS hydrogel showed worthy activity in H2 generation from Na2S/Na2SO3 aqueous solution under UV radiation with a production rate of 18.8 µmol·h−1. PVA-ZnOS composite hydrogel is a separation-free photocatalyst, which is prospective in a solution-based photocatalytic reactor. Full article
(This article belongs to the Special Issue Photo- and Electro-Catalysis of Nanomaterials for Energy Conversion and Storage)
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12 pages, 3853 KiB  
Communication
In Situ Wet Etching of MoS2@dWO3 Heterostructure as Ultra-Stable Highly Active Electrocatalyst for Hydrogen Evolution Reaction
by Xintian Liu and Congwei Wang
Catalysts 2020, 10(9), 977; https://0-doi-org.brum.beds.ac.uk/10.3390/catal10090977 - 31 Aug 2020
Cited by 8 | Viewed by 4194
Abstract
Electrocatalysts featuring robust structure, excellent catalytic activity and strong stability are highly desirable, but challenging. The rapid development of two-dimensional transition metal chalcogenide (such as WO3, MoS2 and WS2) nanostructures offers a hopeful strategy to increase the active [...] Read more.
Electrocatalysts featuring robust structure, excellent catalytic activity and strong stability are highly desirable, but challenging. The rapid development of two-dimensional transition metal chalcogenide (such as WO3, MoS2 and WS2) nanostructures offers a hopeful strategy to increase the active edge sites and expedite the efficiency of electronic transport for hydrogen evolution reaction. Herein, we report a distinctive strategy to construct two-dimensional MoS2@dWO3 heterostructure nanosheets by in situ wet etching. Synthesized oxygen-incorporated MoS2-was loaded on the surface of defective WO3 square nanoframes with abundant oxygen vacancies. The resulting nanocomposite exhibits a low overpotential of 191 mV at 10 mA cm−2 and a very low Tafel slope of 42 mV dec−1 toward hydrogen evolution reaction. The long-term cyclic voltammetry cycling of 5000 cycles and more than 80,000 s chronoamperometry tests promises its outstanding stability. The intimate and large interfacial contact between MoS2 and WO3, favoring the charge transfer and electron–hole separation by the synergy of defective WO3 and oxygen-incorporated MoS2, is believed the decisive factor for improving the electrocatalytic efficiency of the nanocomposite. Moreover, the defective WO3 nanoframes with plentiful oxygen vacancies could serve as an anisotropic substrate to promote charge transport and oxygen incorporation into the interface of MoS2. This work provides a unique methodology for designing and constructing excellently heterostructure electrocatalysts for hydrogen evolution reaction. Full article
(This article belongs to the Special Issue Photo- and Electro-Catalysis of Nanomaterials for Energy Conversion and Storage)
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12 pages, 1872 KiB  
Article
Manipulatable Interface Electric Field and Charge Transfer in a 2D/2D Heterojunction Photocatalyst via Oxygen Intercalation
by Minyeong Je, Eun Seob Sim, Jungwook Woo, Heechae Choi and Yong-Chae Chung
Catalysts 2020, 10(5), 469; https://0-doi-org.brum.beds.ac.uk/10.3390/catal10050469 - 25 Apr 2020
Cited by 5 | Viewed by 3267
Abstract
Charge separation is the most important factor in determining the photocatalytic activity of a 2D/2D heterostructure. Despite the exclusive advantages of 2D/2D heterostructure semiconductor systems such as large surface/volume ratios, their use in photocatalysis is limited due to the low efficiency of charge [...] Read more.
Charge separation is the most important factor in determining the photocatalytic activity of a 2D/2D heterostructure. Despite the exclusive advantages of 2D/2D heterostructure semiconductor systems such as large surface/volume ratios, their use in photocatalysis is limited due to the low efficiency of charge separation and high recombination rates. As a remedy for the weak interlayer binding and low carrier transport efficiency in 2D/2D heterojunctioned semiconductors, we suggested an impurity intercalation method for the 2D/2D interface. PtS2/C3N4, as a prototype heterojunction material, was employed to investigate the effect of anion intercalation on the charge separation efficiency in a 2D/2D system using density functional theory. With oxygen intercalation at the PtS2/C3N4 interface, a reversed and stronger localized dipole moment and a built-in electric field were induced in the vertical direction of the PtS2/C3N4 interface. This theoretical work suggests that the anion intercalation method can be a way to control built-in electric fields and charge separation in designs of 2D/2D heterostructures that have high photocatalytic activity. Full article
(This article belongs to the Special Issue Photo- and Electro-Catalysis of Nanomaterials for Energy Conversion and Storage)
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Review

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39 pages, 8804 KiB  
Review
Non-Thermal Plasma for Process and Energy Intensification in Dry Reforming of Methane
by Rufat Sh. Abiev, Dmitry A. Sladkovskiy, Kirill V. Semikin, Dmitry Yu. Murzin and Evgeny V. Rebrov
Catalysts 2020, 10(11), 1358; https://0-doi-org.brum.beds.ac.uk/10.3390/catal10111358 - 22 Nov 2020
Cited by 41 | Viewed by 6399
Abstract
Plasma-assisted dry reforming of methane (DRM) is considered as a potential way to convert natural gas into fuels and chemicals under near ambient temperature and pressure; particularly for distributed processes based on renewable energy. Both catalytic and photocatalytic technologies have been applied for [...] Read more.
Plasma-assisted dry reforming of methane (DRM) is considered as a potential way to convert natural gas into fuels and chemicals under near ambient temperature and pressure; particularly for distributed processes based on renewable energy. Both catalytic and photocatalytic technologies have been applied for DRM to investigate the CH4 conversion and the energy efficiency of the process. For conventional catalysis; metaldoped Ni-based catalysts are proposed as a leading vector for further development. However; coke deposition leads to fast deactivation of catalysts which limits the catalyst lifetime. Photocatalysis in combination with non-thermal plasma (NTP), on the other hand; is an enabling technology to convert CH4 to more reactive intermediates. Placing the catalyst directly in the plasma zone or using post-plasma photocatalysis could generate a synergistic effect to increase the formation of the desired products. In this review; the recent progress in the area of NTP-(photo)catalysis applications for DRM has been described; with an in-depth discussion of novel plasma reactor types and operational conditions including employment of ferroelectric materials and nanosecond-pulse discharges. Finally, recent developments in the area of optical diagnostic tools for NTP, such as optical emission spectroscopy (OES), in-situ FTIR, and tunable diode laser absorption spectroscopy (TDLAS), are reviewed. Full article
(This article belongs to the Special Issue Photo- and Electro-Catalysis of Nanomaterials for Energy Conversion and Storage)
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