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Hydrogen Production from Organic Waste Water Electro-oxidation Processes

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

Deadline for manuscript submissions: closed (30 November 2022) | Viewed by 6630

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Special Issue Editors

Dr. Maria C. Garcia-Alegre

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Guest Editor

Spanish National Research Council (CSIC), Centre for Automation and Robotics (CAR), Madrid, Spain
Interests: autonomous vehicles; fuzzy artificial intelligent systems; fuel cells; renewable energy in transport and buildings; hydrogen production

Dr. Domingo Guinea

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Guest Editor

Special Issue Information

Dear colleagues,

Low-cost processes for hydrogen production are deeply investigated by many research groups. Hydrogen can be produced by different procedures such as thermal, electrolytic, and photolytic processes. Water electrolysis, as an electrolytic process, can result in zero greenhouse gas emissions, using renewable energy inputs, where water is split into two compounds in an expensive process. Electrolysis produces clean hydrogen although it has as disadvantages its low kinetics and usually expensive technology.

Hydrogen production by electrooxidation processes is increasingly playing a decisive role in renewable energy storage and use, as a clean energy source. Here, organic waste water appears as a source of hydrogen at room temperature at a reduced cost compared to current hydrogen generation treatments that require high temperature and have significant costs.

The use of organic waste water as a source of hydrogen arises from the difficulties of the treatment of the abundant organic wastes, either industrial, farming, food processing, or domestic. Every year millions of tons of waste water are generated, and there is not a single treatment able to reduce the organic contaminants below regulations and environmental requirements. In addition, hydrogen generation is increasingly important on account of its multiple applications as a clean energy vector.

This Special Issue aims to contribute to the demonstration of the possibilities and costs of waste water electrolysis processes for hydrogen generation and simultaneous organic pollutants reduction at ambience temperature. We invite you to submit papers on innovative technical developments, reviews, and case studies relevant for hydrogen generation from waste water electro-oxidation processes.

Dr. Maria C. Garcia-Alegre
Dr. Domingo Guinea
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.

Keywords

hydrogen production
electro-oxidation process
electrolysis
organic waste water
electrode material

Published Papers (3 papers)

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Research

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19 pages, 2921 KiB

Open AccessFeature PaperArticle

Hydrogen Production by Wastewater Alkaline Electro-Oxidation

by Laura Pérez Orosa, Eva Chinarro, Domingo Guinea and María C. García-Alegre

Energies 2022, 15(16), 5888; https://0-doi-org.brum.beds.ac.uk/10.3390/en15165888 - 13 Aug 2022

Cited by 3 | Viewed by 2143

Abstract

The current work presents the electro-oxidation of olive mill and biodiesel wastewaters in an alkaline medium with the aim of hydrogen production and simultaneous reduction in the organic pollution content. The process is performed, at laboratory scale, in an own-design single cavity electrolyzer with graphite electrodes and no membrane. The system and the procedures to generate hydrogen under ambient conditions are described. The gas flow generated is analyzed through gas chromatography. The wastewater balance in the liquid electrolyte shows a reduction in the chemical oxygen demand (COD) pointing to a decrease in the organic content. The experimental results confirm the production of hydrogen with different purity levels and the simultaneous reduction in organic contaminants. This wastewater treatment appears as a feasible process to obtain hydrogen at ambient conditions powered with renewable energy sources, resulting in a more competitive hydrogen cost. Full article

(This article belongs to the Special Issue Hydrogen Production from Organic Waste Water Electro-oxidation Processes)

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21 pages, 12905 KiB

Open AccessArticle

Ab-Initio Molecular Dynamics Simulation of Condensed-Phase Reactivity: The Electrolysis of Ammonia and Ethanimine in Aquatic Carbon Dioxide Solutions

by Igor Gordiy, Lukas Steinbach and Irmgard Frank

Energies 2021, 14(20), 6510; https://0-doi-org.brum.beds.ac.uk/10.3390/en14206510 - 11 Oct 2021

Viewed by 1834

Abstract

The re-use of wastewater is an increasingly important subject. Most recently, several attempts were reported to convert wastewater in harmless or even valuable substances by the use of electrical current. Electrochemistry is an old approach. The renewed interest stems from the fact that electrical current is often available in abundance, for example from solar energy in arid regions, while clean water is not. Experimentally, one has to deal with very many products which are the result of many reaction steps. Here, theory can help. Using Car–Parrinello molecular dynamics, we simulate the first few reaction steps of the electrolysis of wastewater. On the basis of previous studies, we investigate the reaction of carbon dioxide and nitrogen compounds. The results show a great variety of reaction steps and resulting products. Some of them are technologically interesting, such as hydrogen and formic acid. Full article

(This article belongs to the Special Issue Hydrogen Production from Organic Waste Water Electro-oxidation Processes)

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13 pages, 1091 KiB

Open AccessFeature PaperPerspective

Alkaline Electrolysis for Hydrogen Production at Sea: Perspectives on Economic Performance

by Rafael d’Amore-Domenech, Isabel Carrillo, Emilio Navarro and Teresa J. Leo

Energies 2023, 16(10), 4033; https://0-doi-org.brum.beds.ac.uk/10.3390/en16104033 - 11 May 2023

Viewed by 2057

Abstract

Alkaline electrolysis is already a proven technology on land, with a high maturity level and good economic performance. However, at sea, little is known about its economic performance toward hydrogen production. Alkaline electrolysis units operate with purified water to split its molecules into hydrogen and oxygen. Purified water, and especially that sourced from the sea, has a variable cost that ultimately depends on its quality. However, the impurities present in that purified water have a deleterious effect on the electrolyte of alkaline electrolysis units that cause them to drop their energy efficiency. This, in turn, implies a source of economic losses resulting from the cost of electricity. In addition, at sea, there are various options regarding the electrolyte management, of which the cost depends on various factors. All these factors ultimately impact on the levelized cost of the produced hydrogen. This article aims to shed some light on the economic performance of alkaline electrolysis units operating under sea conditions, highlighting the knowledge gaps in the literature and initiating a debate in the field. Full article

(This article belongs to the Special Issue Hydrogen Production from Organic Waste Water Electro-oxidation Processes)

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