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Advances in Photocatalytic and Photoelectrochemical Water Splitting
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Advances in Photocatalytic and Photoelectrochemical Water Splitting

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Catalytic Materials".

Deadline for manuscript submissions: closed (20 January 2023) | Viewed by 5647

Special Issue Editor

Dr. Guijun Ma

E-Mail Website
Guest Editor
School of Physical Science and Technology, ShanghaiTech University, Shanghai, China
Interests: solar-light driven photocatalytic; photoelectrochemical water splitting

Special Issue Information

Dear Colleagues,

The fossil energy resources upon which we are heavily dependent will inevitably be depleted in the not-so-distant future. Solar energy may be the best and perhaps only choice for meeting long-term human energy needs. As an important technology for converting and storing solar energy, photocatalytic and photoelectrochemical H2 production from water has made significant progress since the report of the Fujishima–Honda effect in 1972.

In this Special Issue, we aim to cover experimental and principal studies related to heterogeneous photocatalytic and photoelectrochemical water splitting from the aspects of materials, chemistry, and physics, including but not limited to the following subjects:

  1. Overall or sacrificial water-splitting reactions;
  2. Development of new reaction systems for water splitting;
  3. Development of visible-light-responsive photocatalysts;
  4. Methodologies applied to the synthesis of semiconductor catalysts;
  5. Mechanism explanations from bulk, interface, and surface;
  6. Innovations for practical application.

We hope to provide a widely accepted and rapidly responded platform for researchers interested in heterogeneous light-driven water splitting reactions. 

Dr. Guijun Ma
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. Materials is an international peer-reviewed open access semimonthly 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

  • photocatalysis
  • photoelectrochemistry
  • water splitting
  • hydrogen
  • inorganic semiconductor

Published Papers (3 papers)

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Research

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13 pages, 2821 KiB  
Article
Photocatalytic Hydrogen Evolution from Artificial Seawater Splitting over Amorphous Carbon Nitride: Optimization and Process Parameters Study via Response Surface Modeling
by Michell K. T. Chee, Boon-Junn Ng, Yi-Hao Chew, Wei Sea Chang and Siang-Piao Chai
Materials 2022, 15(14), 4894; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15144894 - 14 Jul 2022
Cited by 2 | Viewed by 1440
Abstract
Photocatalytic water splitting has garnered tremendous attention for its capability to produce clean and renewable H2 fuel from inexhaustible solar energy. Until now, most research has focused on scarce pure water as the source of H2, which is not consistent [...] Read more.
Photocatalytic water splitting has garnered tremendous attention for its capability to produce clean and renewable H2 fuel from inexhaustible solar energy. Until now, most research has focused on scarce pure water as the source of H2, which is not consistent with the concept of sustainable energy. Hence, the importance of photocatalytic splitting of abundant seawater in alleviating the issue of pure water shortages. However, seawater contains a wide variety of ionic components which have unknown effects on photocatalytic H2 production. This work investigates photocatalytic seawater splitting conditions using environmentally friendly amorphous carbon nitride (ACN) as the photocatalyst. The individual effects of catalyst loading (X1), sacrificial reagent concentration (X2), salinity (X3), and their interactive effects were studied via the Box–Behnken design in response surface modeling towards the H2 evolution reaction (HER) from photocatalytic artificial seawater splitting. A second-order polynomial regression model is predicted from experimental data where the variance analysis of the regressions shows that the linear term (X1, X2), the two-way interaction term X1X2, and all the quadratic terms (X12, X22, X23) pose significant effects towards the response of the HER rate. Numerical optimization suggests that the highest HER rate is 7.16 µmol/h, achievable by dosing 2.55 g/L of ACN in 45.06 g sea salt/L aqueous solution containing 17.46 vol% of triethanolamine. Based on the outcome of our findings, an apparent effect of salt ions on the adsorption behavior of the photocatalyst in seawater splitting with a sacrificial reagent has been postulated. Full article
(This article belongs to the Special Issue Advances in Photocatalytic and Photoelectrochemical Water Splitting)
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9 pages, 4294 KiB  
Article
Enhanced Photocatalysis of Black TiO2/Graphene Composites Synthesized by a Facile Sol–Gel Method Combined with Hydrogenation Process
by Zhaoqing Li, Zhufeng Liu, Xiao Yang, Annan Chen, Peng Chen, Lei Yang, Chunze Yan and Yusheng Shi
Materials 2022, 15(9), 3336; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15093336 - 06 May 2022
Cited by 4 | Viewed by 1682
Abstract
In this study, in situ TiO2 was grown on the surface of graphene by a facile sol–gel method to form black TiO2/graphene composites with highly improved photocatalytic activity. The combination of graphene and TiO2 was beneficial to eliminate the [...] Read more.
In this study, in situ TiO2 was grown on the surface of graphene by a facile sol–gel method to form black TiO2/graphene composites with highly improved photocatalytic activity. The combination of graphene and TiO2 was beneficial to eliminate the recombination of photogenerated electron holes. The self-doping Ti3+ was introduced, accompanied by the crystallization of amorphous TiO2, during the hydrogenation process. Consequently, the narrowed bandgap caused by self-doping Ti3+ enhanced the visible light absorption and thus made the composites appear black. Both of them improved the photocatalytic performance of the synthesized black TiO2/graphene composites. The band structure of the composite was analyzed by valence band XPS, revealing the reason for the high visible light catalytic performance of the composite. The results proved that the black TiO2/graphene composites synthesized show attractive potential for applications in environmental and energy issues. Full article
(This article belongs to the Special Issue Advances in Photocatalytic and Photoelectrochemical Water Splitting)
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Review

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26 pages, 2574 KiB  
Review
Approaches for Modifying Oxide-Semiconductor Materials to Increase the Efficiency of Photocatalytic Water Splitting
by Svetlana Grushevskaya, Irina Belyanskaya and Oleg Kozaderov
Materials 2022, 15(14), 4915; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15144915 - 14 Jul 2022
Cited by 11 | Viewed by 1988
Abstract
The constant increase in the amount of energy consumed and environmental problems associated with the use of fossil fuels determine the relevance of the search for alternative and renewable energy sources. One of these is hydrogen gas, which can be produced by sunlight-driven [...] Read more.
The constant increase in the amount of energy consumed and environmental problems associated with the use of fossil fuels determine the relevance of the search for alternative and renewable energy sources. One of these is hydrogen gas, which can be produced by sunlight-driven photocatalytic water splitting. The decisive role in the efficiency of the process is played by the properties of the photocatalyst. Oxide materials are widely used as photocatalysts due to their appropriate band structure, high-enough photochemical stability and corrosion resistance. However, the bandgap, crystallinity and the surface morphology of oxide materials are subject to improvement. Apart from the properties of the photocatalyst, the parameters of the process influence the hydrogen-production efficiency. This paper outlines the key ways to improve the characteristics of oxide-semiconductor photocatalysts with the optimum parameters of photocatalytic water splitting. Full article
(This article belongs to the Special Issue Advances in Photocatalytic and Photoelectrochemical Water Splitting)
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