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Energies
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Advanced Materials and Technologies for Hydrogen Evolution
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Advanced Materials and Technologies for Hydrogen Evolution

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A5: Hydrogen Energy".

Deadline for manuscript submissions: closed (21 August 2024) | Viewed by 3490

Special Issue Editor

Dr. Zhicheng Liu

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Ocean Univeristy of China, Qingdao 266100, China
Interests: electrocatalyst; metal-organic frameworks; hydrogen evolution; oxygen evolution; nanofiber

Special Issue Information

Dear Colleagues,

Today, the issue of energy consumption and the environmental crisis are major global challenges. Developing clean, renewable, and sustainable energy is crucial for future developments. Hydrogen, with its high energy density, lack of toxic combustion products, and natural abundance, has risen to prominence in the field of energy storage and conversion. As a result, inventing and producing advanced materials capable of achieving an efficient hydrogen evolution will remain a future research priority. This Special Issue focuses on the synthesis and chemistry of novel materials for hydrogen production, as well as on the advancement of fabrication techniques. We intend to present the most recent sophisticated hydrogen evolution materials and technologies.

Topics of interest for publication include, but are not limited to, the following:

Advanced materials for electrocatalytic hydrogen evolution.

Advanced materials for photocatalytic hydrogen evolution.

Advanced materials for photoelectrocatalytic hydrogen evolution.

Advanced materials for thermochemical hydrogen evolution.

Dr. Zhicheng Liu
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.

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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

  • materials science
  • nanotechnology
  • nanomaterial
  • nanocomposites
  • hydrogen evolution
  • oxygen evolution
  • photoelectrochemical water splitting
  • electrocatalyst
  • photocatalyst
  • solar thermochemical water splitting
  • plasma conversion technology
 

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Published Papers (3 papers)

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Research

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17 pages, 37288 KiB  
Article
Photocatalytic Hydrogen Production Enhancement of NiTiO3 Perovskite through Cobalt Incorporation
by Alberto Bacilio Quispe Cohaila, Elisban Juani Sacari Sacari, Wilson Orlando Lanchipa Ramos, Rocío María Tamayo Calderón, Jesús Plácido Medina Salas, Francisco Gamarra Gómez, Ramalinga Viswanathan Mangalaraja and Saravanan Rajendran
Energies 2024, 17(15), 3704; https://doi.org/10.3390/en17153704 - 27 Jul 2024
Viewed by 882
Abstract
In this study, we synthesized pure and cobalt-doped NiTiO3 perovskite nanostructures using a sol–gel method and characterized them to investigate the impact of cobalt incorporation on their photocatalytic hydrogen production under UV light. XRD analysis confirmed the formation of the hexagonal ilmenite [...] Read more.
In this study, we synthesized pure and cobalt-doped NiTiO3 perovskite nanostructures using a sol–gel method and characterized them to investigate the impact of cobalt incorporation on their photocatalytic hydrogen production under UV light. XRD analysis confirmed the formation of the hexagonal ilmenite structure, with lattice parameters increasing with cobalt doping, indicating the substitution of larger Co2+ ions onto smaller Ni2+ sites. Raman spectroscopy revealed a decrease in the intensity of active modes, suggesting crystal structure distortion and oxygen vacancy generation. UV-vis spectroscopy showed a decrease in bandgap energy from 2.24 to 2.16 eV with cobalt doping up to 5%, enhancing UV light absorption. SEM and TEM images revealed nanoparticle agglomeration, while cobalt doping did not significantly alter particle size up to 5% doping. Photoluminescence spectroscopy revealed an initial increase in PL intensity for NiTiO3-1%Co, followed by a systematic decrease with higher cobalt concentrations, with NiTiO3-10%Co exhibiting the lowest intensity. Photocatalytic experiments demonstrated a remarkable improvement in hydrogen evolution rate with increasing cobalt doping, with NiTiO3-10%Co exhibiting the highest rate of 940 μmol∙g−1·h−1, a 60.4% increase compared to pure NiTiO3. This enhanced performance is attributed to the substitution of Co2+ on Ni2+ sites, the modification of electronic structure, the suppression of electron–hole recombination, and the creation of surface catalytic sites induced by cobalt incorporation. The proposed mechanism involves the introduction of Co2+/Co3+ energy levels within the NiTiO3 bandgap, facilitating charge separation and transfer, with the Co+/Co2+ redox couple aiding in suppressing electron–hole recombination. These findings highlight the potential of cobalt doping to tune the properties of NiTiO3 perovskite for efficient hydrogen production under UV light. Full article
(This article belongs to the Special Issue Advanced Materials and Technologies for Hydrogen Evolution)
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13 pages, 5717 KiB  
Article
Porous Prussian Blue Analogs Decorated Electrospun Carbon Nanofibers as Efficient Electrocatalyst for Overall Water Splitting
by Zhiqing Xiao, Xiubin Zhu, Lu Bai and Zhicheng Liu
Energies 2024, 17(5), 1154; https://doi.org/10.3390/en17051154 - 29 Feb 2024
Viewed by 968
Abstract
Metal-organic frameworks are becoming increasingly important in electrocatalysis as the hydrogen production sector grows. However, their electrocatalytic capability is limited by their inclination to agglomerate and the insufficient exposure of active sites. In this work, a three-step strategy was used to develop a [...] Read more.
Metal-organic frameworks are becoming increasingly important in electrocatalysis as the hydrogen production sector grows. However, their electrocatalytic capability is limited by their inclination to agglomerate and the insufficient exposure of active sites. In this work, a three-step strategy was used to develop a bifunctional electrocatalyst with porous Prussian blue analogs supported on carbon nanofibers. The use of electrospun carbon nanofibers as conductive substrates can successfully address the problem of easy aggregation. Moreover, the etching procedure with tannic acid creates a porous structure that effectively regulates the electrical structure and exposes additional active sites. The resulting catalyst performs well in both the hydrogen evolution reaction and the oxygen evolution reaction, and also exhibits good stability in overall water splitting. The findings of this study present new concepts for the design and fabrication of metal-organic frameworks-based materials in the realm of electrocatalysis. Full article
(This article belongs to the Special Issue Advanced Materials and Technologies for Hydrogen Evolution)
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Review

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23 pages, 1526 KiB  
Review
Overview of the Recent Findings in the Perovskite-Type Structures Used for Solar Cells and Hydrogen Storage
by Meng-Hsueh Kuo, Neda Neykova and Ivo Stachiv
Energies 2024, 17(18), 4755; https://doi.org/10.3390/en17184755 - 23 Sep 2024
Viewed by 1155
Abstract
Perovskite-type structures have unique crystal architecture and chemical composition, which make them highly attractive for the design of solar cells. For instance, perovskite-based solar cells have been shown to perform better than silicon cells, capable of adsorbing a wide range of light wavelengths, [...] Read more.
Perovskite-type structures have unique crystal architecture and chemical composition, which make them highly attractive for the design of solar cells. For instance, perovskite-based solar cells have been shown to perform better than silicon cells, capable of adsorbing a wide range of light wavelengths, and they can be relatively easily manufactured at a low cost. Importantly, the perovskite-based structures can also adsorb a significant amount of hydrogen atoms into their own structure; therefore, perovskite holds promise in the solid-state storage of hydrogen. It is widely expected by the scientific community that the controlled adsorption/desorption of the hydrogen atoms into/from perovskite-based structures can help to overcome the main hydrogen storage issues such as a low volumetric density and the safety concerns (i.e., the hydrogen embrittlement affects strongly the mechanical properties of metals and, as such, the storage or transport of the gaseous hydrogen in the vessels is, especially for large vessel volumes, challenging). The purpose of this review is to provide an updated overview of the recent results and studies focusing on the perovskite materials used for both solar cells and hydrogen storage applications. Particular attention is given to (i) the preparation and the achievable efficiency and stability of the perovskite solar cells and (ii) the structural, thermodynamic, and storage properties of perovskite hydrides and oxides. We show that the perovskite materials can not only reach the efficiency above current Si-based solar cells but also, due to good stability and reasonable price, can be preferable in the solid-state storage of hydrogen. Then, the future trends and directions in the research and application of perovskite in both solar cells and hydrogen storage are also highlighted. Full article
(This article belongs to the Special Issue Advanced Materials and Technologies for Hydrogen Evolution)
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