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Catalysts
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Photocatalytic CO2 Reduction Utilizing Light Energy Effectively
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Photocatalytic CO2 Reduction Utilizing Light Energy Effectively

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

Deadline for manuscript submissions: closed (30 September 2022) | Viewed by 4973

Special Issue Editors

Dr. Akira Nishimura

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Mie University, Tsu 5148507, Mie, Japan
Interests: smart city utilizing renewable energy; electro-chemical energy processes; heat and mass transfer processes; renewable energy based electrolytic hydrogen production; fuel cell technologies; smart city orientation for wind and solar energy applications; photocatalytic CO2 reduction
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Qingfeng Zhang

E-Mail Website
Guest Editor
College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, China
Interests: Nanocatalysis; Plasmonics; SERS
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

It has been known for years that photocatalysts can convert CO2 into fuel such as CO, CH4, CH3OH, and so on. Recent efforts have focused on developing photocatalytic CO2 reduction technology, which should be carbon-neutral to be successful and widely used. However, the amount of product available and conversion efficiency are both quite low, and there are certain significant barriers to solving this problem—for example, the lack of a source of light energy, which is necessary for photocatalytic CO2 reduction. If light energy can be used effectively, it is expected that the CO2 reduction performance of photocatalysts will be improved. Conversion efficiency, quantum efficiency, and wave length and intensity of light are also important factors. This Special Issue focuses on issues linked to CO2 reduction technology and research that addresses the problems preventing us from achieving this goal.

Prof. Dr. Akira Nishimura
Prof. Dr. Qingfeng Zhang
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 2200 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
  • CO2 reduction
  • Visible light response
  • Energy conversion
  • Quantum efficiency

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Published Papers (2 papers)

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Research

12 pages, 2499 KiB  
Article
Impact of Black Body Material Enhanced Gas Movement on CO2 Photocatalytic Reduction Performance
by Akira Nishimura, Takaharu Kato, Homare Mae and Eric Hu
Catalysts 2022, 12(5), 470; https://doi.org/10.3390/catal12050470 - 22 Apr 2022
Cited by 3 | Viewed by 1993
Abstract
Gas movement around and/or through the photocatalyst is thought to be an inhibition factor to promote photocatalytic CO2 reduction performance. In this study, a hypothesis is put forward that the natural thermosiphon movement of gases around the photocatalyst can be improved by [...] Read more.
Gas movement around and/or through the photocatalyst is thought to be an inhibition factor to promote photocatalytic CO2 reduction performance. In this study, a hypothesis is put forward that the natural thermosiphon movement of gases around the photocatalyst can be improved by using black body material/surface. The black body material/surface that is placed underneath the photocatalyst in the reactor would be heated by absorbing light and then this heats up the gases to promote their movement around/through the photocatalyst. The aim of this study is to prove or disprove this hypothesis by conducting CO2 reduction performance of a TiO2 photocatalyst with NH3 under the conditions without black body material (W/O B.B.), with one black body material (W B.B.-1), and with three black body materials (W B.B.-3). The impact of molar ratio of CO2/NH3 on CO2 reduction performance is also investigated. This study revealed/proved that the hypothesis worked and that the CO2 reduction performance is promoted more with W B.B.-3 compared to that with W B.B.-1. The maximum concentration of formed CO with W B.B.-3 is two to five times as large as that under the condition W/O B.B. Full article
(This article belongs to the Special Issue Photocatalytic CO2 Reduction Utilizing Light Energy Effectively)
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16 pages, 4443 KiB  
Article
The Impact of Amount of Cu on CO2 Reduction Performance of Cu/TiO2 with NH3 and H2O
by Akira Nishimura, Yoshito Sakakibara, Akira Koshio and Eric Hu
Catalysts 2021, 11(5), 610; https://doi.org/10.3390/catal11050610 - 10 May 2021
Cited by 3 | Viewed by 2122
Abstract
This study has investigated the impact of molar ratio of CO2 to reductants NH3 and H2O as well as that of Cu loading on CO2 reduction characteristics over Cu/TiO2. No study to optimize the reductants’ combination [...] Read more.
This study has investigated the impact of molar ratio of CO2 to reductants NH3 and H2O as well as that of Cu loading on CO2 reduction characteristics over Cu/TiO2. No study to optimize the reductants’ combination and Cu loading weight in order to enhance CO2 reduction performance of TiO2 has been investigated yet. This study prepared Cu/TiO2 film by loading Cu particles during the pulse arc plasma gun process after coating TiO2 film by the sol-gel and dip-coating process. As to loading weight of Cu, it was regulated by change in the pulse number. This study characterized the prepared Cu/TiO2 film by SEM and EPMA. Additionally, the performance of CO2 reduction has been investigated under the illumination condition of Xe lamp with or without ultraviolet (UV) light. It is revealed that the molar ratio of CO2/NH3/H2O is optimized according to the pulse number. Since the amount of H+ which is the same as that of electron is needed to produce CO decided following the theoretical CO2 reduction reacting with H2O or NH3, larger H+ is needed with the increase in the pulse number. It is revealed that Cu of 4.57 wt% for the pulse number of 200 is the optimum condition, whereas the molar quantity of CO per unit weight of Cu/TiO2 with and without UV light illumination is 34.1 mol/g and 12.0 mol/g, respectively. Full article
(This article belongs to the Special Issue Photocatalytic CO2 Reduction Utilizing Light Energy Effectively)
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