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Processes
Special Issues
Insights into Hydrogen Production Using Solar Energy
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Insights into Hydrogen Production Using Solar Energy

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Energy Systems".

Deadline for manuscript submissions: 15 August 2025 | Viewed by 365

Special Issue Editor

Dr. Mahmoud Eltaweel

E-Mail Website
Guest Editor
Energy and Sustainable Manufacturing Research Group, School of Physics, Engineering and Computer Science, University of Hertfordshire, Hatfield AL10 9AB, UK
Interests: solar energy; energy storage; heat transfer

Special Issue Information

Dear Colleagues,

We are delighted to invite you to submit your contributions to a Special Issue of the journal Processes (MDPI) titled “Insights into Hydrogen Production Using Solar Energy”.

Hydrogen is emerging as a leading sustainable energy carrier, with the potential to decarbonise a variety of sectors. Integrating solar energy in hydrogen production processes plays a key role in advancing carbon-neutral technologies and reducing our reliance on fossil fuels.

This Special Issue aims to gather high-quality research papers, reviews, and case studies that explore current trends, challenges, and opportunities in solar-driven hydrogen generation.

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

  • Photoelectrochemical water splitting for hydrogen production;
  • Thermochemical and photothermal hydrogen production methods;
  • Catalysts and materials for enhanced solar-to-hydrogen conversion;
  • System designs and reactor configurations for solar hydrogen production;
  • Techno-economic assessments of solar-driven hydrogen generation;
  • Policy, market, and sustainability considerations in solar hydrogen initiatives.

By focusing on the technological, economic, and environmental aspects of solar hydrogen generation, we hope to advance knowledge and provide a platform for innovative research that supports the global energy transition. We welcome contributions from academic, industrial, and governmental researchers who wish to share insights and foster multi-faceted discussions on these emerging topics.

We look forward to receiving your valuable submissions, which will help drive progress and encourage collaboration within this vibrant field of research.

Thank you for your consideration and support.

Dr. Mahmoud Eltaweel
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. Processes 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 2400 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

  • solar-to-hydrogen conversion
  • photoelectrochemical water splitting
  • photocatalysis for hydrogen generation
  • thermochemical hydrogen production
  • renewable energy integration

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (1 paper)

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42 pages, 4293 KiB  
Article
Optimizing Hydrogen Liquefaction Efficiency Through Waste Heat Recovery: A Comparative Study of Three Process Configurations
by Seyed Masoud Banijamali, Adrian Ilinca, Ali Alizadeh Afrouzi and Daniel R. Rousse
Processes 2025, 13(5), 1349; https://doi.org/10.3390/pr13051349 - 28 Apr 2025
Viewed by 38
Abstract
Hydrogen (H2) liquefaction is an energy-intensive process, and improving its efficiency is critical for large-scale deployment in H2 infrastructure. Industrial waste heat recovery contributes to energy savings and environmental improvements in liquid H2 processes. This study proposes a comparative [...] Read more.
Hydrogen (H2) liquefaction is an energy-intensive process, and improving its efficiency is critical for large-scale deployment in H2 infrastructure. Industrial waste heat recovery contributes to energy savings and environmental improvements in liquid H2 processes. This study proposes a comparative framework for industrial waste heat recovery in H2 liquefaction systems by examining three recovery cycles, including an ammonia–water absorption refrigeration (ABR) unit, a diffusion absorption refrigeration (DAR) process, and a combined organic Rankine/Kalina plant. All scenarios incorporate 2 MW of industrial waste heat to improve precooling and reduce the external power demand. The simulations were conducted using Aspen HYSYS (V10) in combination with an m-file code in MATLAB (R2022b) programming to model each configuration under consistent operating conditions. Detailed energy and exergy analyses are performed to assess performance. Among the three scenarios, the ORC/Kalina-based system achieves the lowest specific power consumption (4.306 kWh/kg LH2) and the highest exergy efficiency in the precooling unit (70.84%), making it the most energy-efficient solution. Although the DAR-based system shows slightly lower performance, the ABR-based system achieves the highest exergy efficiency of 52.47%, despite its reduced energy efficiency. By comparing three innovative configurations using the same industrial waste heat input, this work provides a valuable tool for selecting the most suitable design based on either energy performance or thermodynamic efficiency. The proposed methodology can serve as a foundation for future system optimization and scale-up. Full article
(This article belongs to the Special Issue Insights into Hydrogen Production Using Solar Energy)
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