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Catalysts
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New Advances in Photocatalytic Hydrogen Production
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New Advances in Photocatalytic Hydrogen Production

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

Deadline for manuscript submissions: closed (31 August 2024) | Viewed by 3822

Special Issue Editors

Dr. Bing Luo

E-Mail Website
Guest Editor
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China
Interests: solar energy conversion; photocatalysis; water splitting; surface plasmon resonance; gas sensing; quantum dots
Dr. Xu Guo

E-Mail Website
Guest Editor
Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi’an 710119, China
Interests: photocatalysts; heterostructures; solar water splitting; interfacial charge transfer

Special Issue Information

Dear Colleagues,

Clean and carbon-free hydrogen exhibits promise regarding its capacity to become the most feasible energy carrier of traditional fossil fuels. Photocatalytic technology could convert sustainable solar energy to hydrogen without the emission of any contaminants; therefore, addressing energy issues and achieving carbon neutrality is an appealing approach. This specific field has already attracted extensive attention and is now relevant in the domain of solar-to-hydrogen efficiency, fulfilling the requirements of industrial application.

This Special Issue, entitled “New Advances in Photocatalytic Hydrogen Production”, will cover the most recent progress in the discovery of novel materials and the design of efficient catalysts, the fundamental exploration of the reaction mechanism, and the development of advanced characterization methods, etc., relating to photocatalytic hydrogen production. This Special Issue welcomes the submission of original research and review papers within its scope and aims to inspire further developments in this expanding and prospering research field.

Dr. Bing Luo
Dr. Xu Guo
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 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

  • photocatalysis
  • solar energy
  • water splitting
  • hydrogen production
  • solar-to-hydrogen efficiency

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Published Papers (3 papers)

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Research

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13 pages, 2694 KiB  
Article
Investigating the Impact of Stress on the Optical Properties of GaN-MX2 (M=Mo, W; X=S, Se) Heterojunctions Using the First Principles
by Xu-Cai Zhao, Meng-Yao Dai, Fu-Mei Lang, Can Zhao, Qiao-Yue Chen, Li-Li Zhang, Yi-Neng Huang, Hai-Ming Lu and Xiao-Chuan Qin
Catalysts 2024, 14(10), 732; https://doi.org/10.3390/catal14100732 - 19 Oct 2024
Viewed by 638
Abstract
This study used the first-principles-based CASTEP software to calculate the structural, electronic, and optical properties of heterojunctions based on single-layer GaN. GaN-MX2 exhibited minimal lattice mismatches, typically less than 3.5%, thereby ensuring lattice coherence. Notably, GaN-MoSe2 had the lowest binding energy, [...] Read more.
This study used the first-principles-based CASTEP software to calculate the structural, electronic, and optical properties of heterojunctions based on single-layer GaN. GaN-MX2 exhibited minimal lattice mismatches, typically less than 3.5%, thereby ensuring lattice coherence. Notably, GaN-MoSe2 had the lowest binding energy, signifying its superior stability among the variants. When compared to single-layer GaN, which has an indirect band gap, all four heterojunctions displayed a smaller direct band gap. These heterojunctions were classified as type II. GaN-MoS2 and GaN-MoSe2 possessed relatively larger interface potential differences, hinting at stronger built-in electric fields. This resulted in an enhanced electron–hole separation ability. GaN-MoSe2 exhibited the highest value for the real part of the dielectric function. This suggests a superior electronic polarization capability under an electric field, leading to high electron mobility. GaN-MoSe2 possessed the strongest optical absorption capacity. Consequently, GaN-MoSe2 was inferred to possess the strongest photocatalytic capability. The band structure and optical properties of GaN-MoSe2 under applied pressure were further calculated. The findings revealed that stress significantly influenced the band gap width and light absorption capacity of GaN-MoSe2. Specifically, under a pressure of 5 GPa, GaN-MoSe2 demonstrated a significantly narrower band gap and enhanced absorption capacity compared to its intrinsic state. These results imply that the application of stress could potentially boost its photocatalytic performance, making it a promising candidate for various applications. Full article
(This article belongs to the Special Issue New Advances in Photocatalytic Hydrogen Production)
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19 pages, 4832 KiB  
Article
A Numerical Case Study of Particle Flow and Solar Radiation Transfer in a Compound Parabolic Concentrator (CPC) Photocatalytic Reactor for Hydrogen Production
by Jiafeng Geng, Qingyu Wei, Bing Luo, Shichao Zong, Lijing Ma, Yu Luo, Chunyu Zhou and Tongkun Deng
Catalysts 2024, 14(4), 237; https://doi.org/10.3390/catal14040237 - 2 Apr 2024
Cited by 1 | Viewed by 1367
Abstract
Compound parabolic concentrator (CPC) photocatalytic reactors are commonly used for photocatalytic water splitting in hydrogen production. This study aimed to gain a better understanding of the physical processes in CPC photocatalytic reactors and provide theoretical support for their design, optimization, and operation. The [...] Read more.
Compound parabolic concentrator (CPC) photocatalytic reactors are commonly used for photocatalytic water splitting in hydrogen production. This study aimed to gain a better understanding of the physical processes in CPC photocatalytic reactors and provide theoretical support for their design, optimization, and operation. The analysis involved the ray tracing approach, Euler–Euler two-fluid model, and discrete ordinates method (DOM) to study solar radiation transfer and particle flow in the reactor. The distribution of solar radiation on the receiving tube’s surface after CPC concentration was obtained by conducting the ray tracing approach. This solar radiation distribution was then coupled into the Euler–Euler two-fluid model to solve for the natural convection flow field, the temperature field, and particle phase volume fraction distribution inside the receiving tube over a period of 120 s. Lastly, the discrete ordinates method (DOM) was used to analyze the transfer of radiation inside the receiving tube at different times, obtaining the distribution of local volume radiative power absorption (LVRPA) and the total radiative power absorption (TRPA) inside the tube. The results showed that the TRPA reached its maximum at 120 s, accounting for 66.61% of the incident solar UV radiation. According to the above results, it could be suggested that adopting an intermittent operation mode in CPC photocatalytic reactors is reasonable and efficient. Full article
(This article belongs to the Special Issue New Advances in Photocatalytic Hydrogen Production)
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Review

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56 pages, 16441 KiB  
Review
Recent Strategies to Improve the Photocatalytic Efficiency of TiO2 for Enhanced Water Splitting to Produce Hydrogen
by Tehmeena Ishaq, Zainab Ehsan, Ayesha Qayyum, Yasir Abbas, Ali Irfan, Sami A. Al-Hussain, Muhammad Atif Irshad and Magdi E. A. Zaki
Catalysts 2024, 14(10), 674; https://doi.org/10.3390/catal14100674 - 30 Sep 2024
Viewed by 1270
Abstract
Hydrogen production is one of the best solutions to the growing energy concerns, owing to its clean and sustainable assets. The current review gives an overview of various hydrogen production technologies, highlighting solar water splitting as a promising approach for its sustainable production. [...] Read more.
Hydrogen production is one of the best solutions to the growing energy concerns, owing to its clean and sustainable assets. The current review gives an overview of various hydrogen production technologies, highlighting solar water splitting as a promising approach for its sustainable production. Moreover, it gives a detailed mechanism of the water-splitting reaction and describes the significance of titania-based catalysts for solar water splitting. It further highlights diversified strategies to improve the catalytic efficiency of TiO2 for the enhanced hydrogen production. These strategies include the doping of TiO2, dye sensitization, and the addition of co-catalysts. Doping reduces the bandgap by generating new energy levels in TiO2 and encourages visible-light absorption. Sensitization with dyes tunes the electronic states, which in turn broadens the light-absorption capacity of titania. Constructing heterojunctions reduces the charge recombination of TiO2, while co-catalysts increase the number of active sites for an enhanced reaction rate. Thus, every modification strategy has a positive impact on the stability and photocatalytic efficiency of TiO2 for improved water splitting. Lastly, this review provides a comprehensive description and future outlook for developing efficient catalysts to enhance the hydrogen production rate, thereby fulfilling the energy needs of the industrial sector. Full article
(This article belongs to the Special Issue New Advances in Photocatalytic Hydrogen Production)
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