Dear Colleagues,

The intention of launching this Special Issue is to disclose the latest developments in fermentative hydrogen production. The theme has been exhaustively investigated over more than a decade; however, this technology is still waiting for the scaling up of cost-effective processes.

What are the challenges that fermentative hydrogen processes face to reach maturity? To help us answering this question, we kindly invite you to contribute to this Special Issue, covering the following topics:

Biomass: the search for new, inexpensive and widely available biomass resources, especially those that represent waste streams, the use of multifeedstock combinations that may help overcome process scale constraints, additional aspects related with sustainability and logistics of the biomass feedstock are exemplary issues to address, that may bring new perspectives to the study of biohydrogen production.

Microorganisms: low productivity and robustness are the major challenges in the scale up of the fermentative hydrogen production. This Special Issue invites articles including, but not limited to, novel hydrogen-producing microorganisms with improved characteristics for the establishment of robust and productive hydrogen processes. Articles which deal with the latest hot topics in synthetic biology including artificial genes, metabolic engineering of strains, as well as definition and monitoring of engineered microbial consortia, and possibly the development of certified starters are of special interest. Additionally, articles which discuss bioaugmentation strategies to outperform natural microbial consortia are welcome.

Production and aplications: articles focusing advances in process optimization, introducing innovative and more efficient schemes of process integration, including fuel cell applications, disclosing new potential applications that comprise, e.g., ecentralized production possibilities, exploring the development of hydrogen biorefineries and the contribution of co-metabolites production, and reporting a realistic appraisal of the technological and economic viability of biological hydrogen production, are invited.

Dr. Patrícia Moura
Dr. Idania Valdez-Vazquez
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. Energies 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 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.

• biohydrogen
• dark fermentation
• hydrogen-producing strains
• microbial consortia
• bioaugmentation
• synthetic biology
• biomass feedstock
• waste and byproducts
• hydrogen biorefinery
• sustainability