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Advances in Hydrogen Production Technologies for Green Energy

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Energy Science and Technology".

Deadline for manuscript submissions: 30 May 2026 | Viewed by 694

Special Issue Editors


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Guest Editor
Department of Chemical Engineering, Faculty of Sciences, Universidad Autónoma de Madrid (UAM), Cantoblanco, 28049 Madrid, Spain
Interests: biomass; biowastes; aqueous-phase reforming; hydrodechlorination water treatment; mesoporous carbon; doped carbon; environmental chemistry
Special Issues, Collections and Topics in MDPI journals

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Guest Editor Assistant
Carbon Science and Technology Institute (INCAR), Spanish Council for Scientific Research (CSIC), 33011 Oviedo, Spain
Interests: thermochemical processes; biomass valorization; catalytic conversion; sustainable chemistry; circular economy

Special Issue Information

Dear Colleagues,

Hydrogen has become the main energy vector for facing the energy transition to a sustainable global model. Electrolysys is currently the main process for producing green hydrogen; however, alternatives are necessary in the face of different technical, economic, and social realities. These include bio-based or thermochemical processes, which are currently under development or being scaled up.

This Special Issue of Applied Sciences aims to share cutting-edge research in the field of sustainable hydrogen production and the work that is being carried out across the world in this area.

Prof. Dr. Francisco Heras
Guest Editor

Dr. Jéssica Justicia
Guest Editor Assistant

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 250 words) can be sent to the Editorial Office for assessment.

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. Applied Sciences 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 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

  • hydrogen
  • green hydrogen
  • renewable hydrogen
  • green energy
  • energy transition

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Published Papers (1 paper)

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Research

17 pages, 991 KB  
Article
Potential of Acrocomia aculeata Pulp Waste for Fermentative Hydrogen Production and the Impact of Hydrothermal Pretreatment
by María Laura Correa-Quevedo, Danilo Cantero, Enkeledo Menalla, José de Jesús Montoya-Rosales, Osvaldo D. Frutos, Raúl Muñoz and Octavio García-Depraect
Appl. Sci. 2025, 15(23), 12523; https://doi.org/10.3390/app152312523 - 26 Nov 2025
Viewed by 346
Abstract
This study provides the first comprehensive evaluation of the biochemical hydrogen production (BHP) potential of Acrocomia aculeata pulp waste, a residue abundantly generated during fruit processing in Latin America. The valorization of this underused biomass is essential to promote circular bioeconomy strategies and [...] Read more.
This study provides the first comprehensive evaluation of the biochemical hydrogen production (BHP) potential of Acrocomia aculeata pulp waste, a residue abundantly generated during fruit processing in Latin America. The valorization of this underused biomass is essential to promote circular bioeconomy strategies and expand renewable energy sources in the region. The fermentative hydrogen potential of untreated pulp and of fractions obtained after subcritical water pretreatment was assessed under mesophilic conditions to quantify hydrogen yields and elucidate the energy distribution between solid and liquid phases. Pretreatments were performed at 150, 200, and 250 °C, and both fractions were individually tested. The untreated pulp achieved the highest BHP (125.1 NmL H2/g VS fed), while pretreated solids showed decreasing values of 118.1, 71.6, and 41.6 NmL H2/g VS fed at 150, 200, and 250 °C, respectively. The liquid fractions yielded 107.2, 79.4, and 76.0 NmL H2/g COD fed, showing a similar decline with increasing severity. A mass-energy balance revealed that 1 ton of residual pulp could produce up to 104 m3 H2, equivalent to 15 GJ/ha-year, while the combined solid plus liquid fractions from pretreatment at 150 °C recovered a comparable 14.5 GJ/ha-year, with 65% of hydrogen energy originating from the liquid phase. More severe conditions led to up to 40% lower total energy yields. These findings demonstrate that A. aculeata pulp waste inherently exhibits high fermentative hydrogen potential without requiring hydrothermal pretreatment, highlighting its direct applicability as a renewable substrate for sustainable biohydrogen production. Full article
(This article belongs to the Special Issue Advances in Hydrogen Production Technologies for Green Energy)
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