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Hydrogen
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Hydrogen Energy Technologies
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Hydrogen Energy Technologies

A special issue of Hydrogen (ISSN 2673-4141).

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 6937

Special Issue Editors

Prof. Dr. Wei Wang

E-Mail Website
Guest Editor
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
Interests: perovskite solar cells; solid oxide cells; protonic ceramic cells; electrocatalysis; photocatalysis; dye-sensitized solar cells; water splitting; hydrogen energy
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Yunfei Bu

E-Mail Website
Guest Editor
School of Environmental Science and Technology, Nanjing University of Information Science and Technology (NUIST), Nanjing 210044, China
Interests: hydrogen evolution; catalysis; chemical science
Special Issues, Collections and Topics in MDPI journals
Dr. Huayang Zhang

E-Mail Website
Guest Editor
School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia
Interests: water splitting; solar-energy conversion; photoelectrocatalysis

Special Issue Information

Dear Colleagues,

Hydrogen has an important potential to replace fossil fuel-based energy infrastructure due to its cleanliness, unlimited supply, and higher energy content per unit mass. It can provide storage options for renewable resources, and when combined with emerging decarbonization technologies, can accelerate the process of scaling up clean and renewable energy. Several technologies have evolved through the years, for hydrogen production/storage and utilization, while at the same time, hydrogen energy still face a number of technical barriers that must be overcome. This Special Issue aims to collect original research articles and comprehensive reviews focusing on hydrogen production, storage, transport, appliacations, and utilization technologies.

Prof. Dr. Wei Wang
Prof. Dr. Yunfei Bu
Dr. Huayang Zhang
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. Hydrogen is an international peer-reviewed open access quarterly 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 1000 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

  • hydrogen technologies
  • fuel cells
  • solar hydrogen
  • hydrogen production
  • techniques for hydrogen storage
  • hydrogen powered energy systems

Published Papers (3 papers)

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Research

8 pages, 2125 KiB  
Communication
Modeling of Liquid Hydrogen Tank Cooled with Para-Orthohydrogen Conversion
by Konstantin I. Matveev and Jacob W. Leachman
Hydrogen 2023, 4(1), 146-153; https://doi.org/10.3390/hydrogen4010010 - 08 Feb 2023
Cited by 4 | Viewed by 2694
Abstract
With the accelerating development of liquid-hydrogen storage facilities, the problem of boil-off hydrogen losses becomes very important. A promising method to reduce these losses is to utilize the endothermic para-orthohydrogen conversion of vented hydrogen, which can effectively decrease heat loads on a hydrogen [...] Read more.
With the accelerating development of liquid-hydrogen storage facilities, the problem of boil-off hydrogen losses becomes very important. A promising method to reduce these losses is to utilize the endothermic para-orthohydrogen conversion of vented hydrogen, which can effectively decrease heat loads on a hydrogen tank. To model such a process, a hybrid computational model has been developed, based on the application of computational fluid dynamics for an ullage space, where knowledge of thermal stratification is important, and reduced-order models for other system elements. The simulation results for a spheroidal tank in selected conditions indicated a 10–25% reduction of boil-off losses due to cooling produced by vented hydrogen undergoing para-ortho-conversion. Full article
(This article belongs to the Special Issue Hydrogen Energy Technologies)
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11 pages, 4782 KiB  
Article
Aluminum Cation Doping in Ruddlesden-Popper Sr2TiO4 Enables High-Performance Photocatalytic Hydrogen Evolution
by Jingsheng He, Xiao Han, Huimin Xiang, Ran Ran, Wei Wang, Wei Zhou and Zongping Shao
Hydrogen 2022, 3(4), 501-511; https://doi.org/10.3390/hydrogen3040032 - 01 Dec 2022
Cited by 1 | Viewed by 1440
Abstract
Hydrogen (H2) is regarded as a promising and renewable energy carrier to achieve a sustainable future. Among the various H2 production routes, photocatalytic water splitting has received particular interest; it strongly relies on the optical and structural properties of photocatalysts [...] Read more.
Hydrogen (H2) is regarded as a promising and renewable energy carrier to achieve a sustainable future. Among the various H2 production routes, photocatalytic water splitting has received particular interest; it strongly relies on the optical and structural properties of photocatalysts such as their sunlight absorption capabilities, carrier transport properties, and amount of oxygen vacancy. Perovskite oxides have been widely investigated as photocatalysts for photocatalytic water splitting to produce H2 because of their distinct optical properties, tunable band gaps and excellent compositional/structural flexibility. Herein, an aluminum cation (Al3+) doping strategy is developed to enhance the photocatalytic performance of Ruddlesden-Popper (RP) Sr2TiO4 perovskite oxides for photocatalytic H2 production. After optimizing the Al3+ substitution concentration, Sr2Ti0.9Al0.1O4 exhibits a superior H2 evolution rate of 331 μmol h−1 g−1, which is ~3 times better than that of Sr2TiO4 under full-range light illumination, due to its enhanced light harvesting capabilities, facilitated charge transfer, and tailored band structure. This work presents a simple and useful Al3+ cation doping strategy to boost the photocatalytic performance of RP-phase perovskites for solar water splitting. Full article
(This article belongs to the Special Issue Hydrogen Energy Technologies)
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10 pages, 3525 KiB  
Article
First Hydrogenation of TiFe with Addition of 20 wt.% Ti
by Elena Ulate-Kolitsky, Bernard Tougas and Jacques Huot
Hydrogen 2022, 3(4), 379-388; https://doi.org/10.3390/hydrogen3040023 - 21 Sep 2022
Cited by 7 | Viewed by 1661
Abstract
In this paper, we report the first hydrogenation (activation) of a 1.2Ti-0.8Fe alloy synthesized by induction melting (9 kg ingot). The alloy presented a three-phase structure composed of a main TiFe phase, a secondary Ti2Fe phase and a Ti-rich BCC phase. [...] Read more.
In this paper, we report the first hydrogenation (activation) of a 1.2Ti-0.8Fe alloy synthesized by induction melting (9 kg ingot). The alloy presented a three-phase structure composed of a main TiFe phase, a secondary Ti2Fe phase and a Ti-rich BCC phase. The alloy required cold rolling to achieve activation at room temperature. However, it did so with good kinetics, reaching saturation (2.6 wt.% H) in about 6 h. After activation, the phases identified were TiFe, Ti2FeHx and an FCC phase. The Ti2FeHx and FCC are the stable hydrides formed by the secondary Ti2Fe and BCC phases, respectively. The stoichiometry of the Ti2FeHx was calculated to be between x = 3.2–4.75. As the microstructure obtained by an industrial-scale synthesis method (induction melting) may be different than the one obtained by laboratory-scale method (arc melting), a small 3 g sample of Ti1.2Fe0.8 was synthesized by arc melting. The lab-scale sample activated (2 wt.% H in ~12 h) without the need for cold rolling. The phases identified for the lab-scale sample matched those found for the induction-melted sample. The phase fractions differed between the samples; the lab-scale sample presented a lower abundance and a finer distribution of the secondary phases. This explains the difference in the kinetics and H capacity. Based on these results it can be concluded that the alloy of composition, 1.2Ti-0.8Fe, can absorb hydrogen without the need for a heat treatment, and that finer microstructures have a strong influence on the activation kinetics regardless of the secondary phases’ phase fractions. Full article
(This article belongs to the Special Issue Hydrogen Energy Technologies)
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