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Two-step thermochemical electrolysis: An approach for green hydrogen production

Pein, Mathias and Neumann, Nicole and Venstrom, Luke and Vieten, Josua and Roeb, Martin and Sattler, Christian (2021) Two-step thermochemical electrolysis: An approach for green hydrogen production. International Journal of Hydrogen Energy, 46 (49), pp. 24909-24918. Elsevier. doi: 10.1016/j.ijhydene.2021.05.036. ISSN 0360-3199.

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S036031992101750X?via%3Dihub


Electrolysis and thermochemical water splitting are approaches to produce green hydrogen that use either an electrical potential (electrolysis) or a chemical potential (thermochemical water splitting) to split water. Electrolysis is technologically mature when applied at low temperatures, but it requires large quantities of electrical energy. In contrast to electrolysis, thermochemical water splitting uses thermal energy, as thermal energy can typically be supplied at a lower unit cost than electrical energy using concentrating solar power. Thermochemical water splitting, however, typically suffers from high thermal losses at the extremely high process temperatures required, substantially increasing the total energy required. We show how, by combining electrical and chemical potentials, a novel and cost-efficient water splitting process can be envisioned that overcomes some of the challenges faced by conventional electrolysis and thermochemical water splitting. It uses a mixed ionic and electronic conducting perovskite with temperature-dependent oxygen non-stoichiometry as an anode in an electrolyzer. If solar energy is used as the primary source of all energy required in the process, the cost of the energy required to produce hydrogen could be lower than in high-temperature electrolysis by up to 7%.

Item URL in elib:https://elib.dlr.de/146067/
Document Type:Article
Title:Two-step thermochemical electrolysis: An approach for green hydrogen production
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Pein, MathiasMathias.Pein (at) dlr.deUNSPECIFIED
Neumann, NicoleNicole.Neumann (at) dlr.deUNSPECIFIED
Venstrom, LukeLuke.Venstrom (at) dlr.deUNSPECIFIED
Vieten, JosuaJosua.Vieten (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.Roeb (at) dlr.deUNSPECIFIED
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Date:16 July 2021
Journal or Publication Title:International Journal of Hydrogen Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.ijhydene.2021.05.036
Page Range:pp. 24909-24918
Keywords:Electrolysis Thermochemical cycle Water splitting Green hydrogen Solar fuel
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Chemical Energy Carriers
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Solar Fuels
Location: Köln-Porz
Institutes and Institutions:Institute of Future Fuels
Institute of Future Fuels > Solar-Chemical Process Development
Deposited By: Bülow, Mark
Deposited On:07 Jan 2022 11:53
Last Modified:07 Jan 2022 11:53

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