Details
| Original language | English |
|---|---|
| Pages (from-to) | 570-580 |
| Number of pages | 11 |
| Journal | Electrochimica acta |
| Volume | 110 |
| Publication status | Published - 2013 |
| Externally published | Yes |
Abstract
Three pathways for high pressure hydrogen production by means of water electrolysis are energetically compared. Besides the two classic paths, comprising either the pressurization of the product gas (path I) or the mechanical pressurization of the feed water (path II), a third path is discussed. It involves the electrochemical co-compression during the electrolysis. The energetic evaluation is based on a uniform model description of the different hydrogen production pathways. It consists of integral, steady-state balances for energy, entropy and mass as well as a modern equation of state. From this the reversible energy demand is used to identify the inherent thermodynamic drawbacks of the pathways. The additional consideration of irreversibilities allows for the determination of efficiency losses due to device specific characteristics. For hydrogen delivery pressures of up to 40 bar the classical pathways are out-performed by path III. Since the hydrogen is already produced at elevated pressure this eliminates the need for an energy consuming mechanical hydrogen compression and spares the additional energy demand due to the oxygen pressurization. However, with increasing pressure differences the hydrogen back-diffusion strongly decreases the Faradaic efficiency of the asymmetric electrolyzer that has to be compensated by an additional energy supply.
Keywords
- Storage of renewable energy, Sustainable hydrogen production, Water electrolysis
ASJC Scopus subject areas
- Chemical Engineering(all)
- Chemistry(all)
- Electrochemistry
Sustainable Development Goals
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In: Electrochimica acta, Vol. 110, 2013, p. 570-580.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Energetic evaluation of high pressure PEM electrolyzer systems for intermediate storage of renewable energies
AU - Bensmann, B.
AU - Hanke-Rauschenbach, R.
AU - Peña Arias, I. K.
AU - Sundmacher, K.
N1 - Copyright: Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013
Y1 - 2013
N2 - Three pathways for high pressure hydrogen production by means of water electrolysis are energetically compared. Besides the two classic paths, comprising either the pressurization of the product gas (path I) or the mechanical pressurization of the feed water (path II), a third path is discussed. It involves the electrochemical co-compression during the electrolysis. The energetic evaluation is based on a uniform model description of the different hydrogen production pathways. It consists of integral, steady-state balances for energy, entropy and mass as well as a modern equation of state. From this the reversible energy demand is used to identify the inherent thermodynamic drawbacks of the pathways. The additional consideration of irreversibilities allows for the determination of efficiency losses due to device specific characteristics. For hydrogen delivery pressures of up to 40 bar the classical pathways are out-performed by path III. Since the hydrogen is already produced at elevated pressure this eliminates the need for an energy consuming mechanical hydrogen compression and spares the additional energy demand due to the oxygen pressurization. However, with increasing pressure differences the hydrogen back-diffusion strongly decreases the Faradaic efficiency of the asymmetric electrolyzer that has to be compensated by an additional energy supply.
AB - Three pathways for high pressure hydrogen production by means of water electrolysis are energetically compared. Besides the two classic paths, comprising either the pressurization of the product gas (path I) or the mechanical pressurization of the feed water (path II), a third path is discussed. It involves the electrochemical co-compression during the electrolysis. The energetic evaluation is based on a uniform model description of the different hydrogen production pathways. It consists of integral, steady-state balances for energy, entropy and mass as well as a modern equation of state. From this the reversible energy demand is used to identify the inherent thermodynamic drawbacks of the pathways. The additional consideration of irreversibilities allows for the determination of efficiency losses due to device specific characteristics. For hydrogen delivery pressures of up to 40 bar the classical pathways are out-performed by path III. Since the hydrogen is already produced at elevated pressure this eliminates the need for an energy consuming mechanical hydrogen compression and spares the additional energy demand due to the oxygen pressurization. However, with increasing pressure differences the hydrogen back-diffusion strongly decreases the Faradaic efficiency of the asymmetric electrolyzer that has to be compensated by an additional energy supply.
KW - Storage of renewable energy
KW - Sustainable hydrogen production
KW - Water electrolysis
KW - Storage of renewable energy
KW - Sustainable hydrogen production
KW - Water electrolysis
UR - http://www.scopus.com/inward/record.url?scp=84888365308&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2013.05.102
DO - 10.1016/j.electacta.2013.05.102
M3 - Article
AN - SCOPUS:84888365308
VL - 110
SP - 570
EP - 580
JO - Electrochimica acta
JF - Electrochimica acta
SN - 0013-4686
ER -