Reversible operation of a pressurized solid oxide cell stack using carbonaceous gases

S. H. Jensen*, H. Langnickel, N. Hintzen, M. Chen, X. Sun, A. Hauch, G. Butera, L. R. Clausen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Low energy conversion efficiency and high storage costs still hamper a successful implementation of sustainable energy systems. Recent theoretical studies show that reversible electrochemical conversion of H2O and CO2 to CH4 inside pressurized solid oxide cells combined with subsurface storage of the produced gases can facilitate seasonal electricity storage with a round-trip efficiency reaching 80% and a storage cost below 3 ¢/kWh. Here we present test results with a 30-cell SOFCMAN 301 stack operated with carbonaceous gases at 18.7 bar and 700 °C in both electrolysis and fuel cell mode. In electrolysis mode the CH4 content in the stack outlet gas increased from 0.22% at open circuit voltage to 18% at a current density of −0.17 A cm−2. The degradation observed by scanning electron microscopy studies correlate well with the observed electrochemical stack degradation. The degradation rates in both fuel cell and electrolysis mode were comparable to previously reported SOFCMAN stack degradation rates measured at ambient pressure operation with H2/H2O gas mixtures.

Original languageEnglish
JournalJournal of Energy Storage
Volume22
Pages (from-to)106-115
ISSN2352-152X
DOIs
Publication statusPublished - 2019

Keywords

  • 80% Round Trip Efficiency
  • Internal
  • Methanation
  • Pressure
  • Reforming
  • SOFCMAN
  • Solid Oxide Cell Stack

Cite this

@article{9540b45d85cc4f4e9a3ea64c90b13443,
title = "Reversible operation of a pressurized solid oxide cell stack using carbonaceous gases",
abstract = "Low energy conversion efficiency and high storage costs still hamper a successful implementation of sustainable energy systems. Recent theoretical studies show that reversible electrochemical conversion of H2O and CO2 to CH4 inside pressurized solid oxide cells combined with subsurface storage of the produced gases can facilitate seasonal electricity storage with a round-trip efficiency reaching 80{\%} and a storage cost below 3 ¢/kWh. Here we present test results with a 30-cell SOFCMAN 301 stack operated with carbonaceous gases at 18.7 bar and 700 °C in both electrolysis and fuel cell mode. In electrolysis mode the CH4 content in the stack outlet gas increased from 0.22{\%} at open circuit voltage to 18{\%} at a current density of −0.17 A cm−2. The degradation observed by scanning electron microscopy studies correlate well with the observed electrochemical stack degradation. The degradation rates in both fuel cell and electrolysis mode were comparable to previously reported SOFCMAN stack degradation rates measured at ambient pressure operation with H2/H2O gas mixtures.",
keywords = "80{\%} Round Trip Efficiency, Internal, Methanation, Pressure, Reforming, SOFCMAN, Solid Oxide Cell Stack",
author = "Jensen, {S. H.} and H. Langnickel and N. Hintzen and M. Chen and X. Sun and A. Hauch and G. Butera and Clausen, {L. R.}",
year = "2019",
doi = "10.1016/j.est.2019.02.003",
language = "English",
volume = "22",
pages = "106--115",
journal = "Journal of Energy Storage",
issn = "2352-152X",
publisher = "Elsevier",

}

Reversible operation of a pressurized solid oxide cell stack using carbonaceous gases. / Jensen, S. H.; Langnickel, H.; Hintzen, N.; Chen, M.; Sun, X.; Hauch, A.; Butera, G.; Clausen, L. R.

In: Journal of Energy Storage, Vol. 22, 2019, p. 106-115.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Reversible operation of a pressurized solid oxide cell stack using carbonaceous gases

AU - Jensen, S. H.

AU - Langnickel, H.

AU - Hintzen, N.

AU - Chen, M.

AU - Sun, X.

AU - Hauch, A.

AU - Butera, G.

AU - Clausen, L. R.

PY - 2019

Y1 - 2019

N2 - Low energy conversion efficiency and high storage costs still hamper a successful implementation of sustainable energy systems. Recent theoretical studies show that reversible electrochemical conversion of H2O and CO2 to CH4 inside pressurized solid oxide cells combined with subsurface storage of the produced gases can facilitate seasonal electricity storage with a round-trip efficiency reaching 80% and a storage cost below 3 ¢/kWh. Here we present test results with a 30-cell SOFCMAN 301 stack operated with carbonaceous gases at 18.7 bar and 700 °C in both electrolysis and fuel cell mode. In electrolysis mode the CH4 content in the stack outlet gas increased from 0.22% at open circuit voltage to 18% at a current density of −0.17 A cm−2. The degradation observed by scanning electron microscopy studies correlate well with the observed electrochemical stack degradation. The degradation rates in both fuel cell and electrolysis mode were comparable to previously reported SOFCMAN stack degradation rates measured at ambient pressure operation with H2/H2O gas mixtures.

AB - Low energy conversion efficiency and high storage costs still hamper a successful implementation of sustainable energy systems. Recent theoretical studies show that reversible electrochemical conversion of H2O and CO2 to CH4 inside pressurized solid oxide cells combined with subsurface storage of the produced gases can facilitate seasonal electricity storage with a round-trip efficiency reaching 80% and a storage cost below 3 ¢/kWh. Here we present test results with a 30-cell SOFCMAN 301 stack operated with carbonaceous gases at 18.7 bar and 700 °C in both electrolysis and fuel cell mode. In electrolysis mode the CH4 content in the stack outlet gas increased from 0.22% at open circuit voltage to 18% at a current density of −0.17 A cm−2. The degradation observed by scanning electron microscopy studies correlate well with the observed electrochemical stack degradation. The degradation rates in both fuel cell and electrolysis mode were comparable to previously reported SOFCMAN stack degradation rates measured at ambient pressure operation with H2/H2O gas mixtures.

KW - 80% Round Trip Efficiency

KW - Internal

KW - Methanation

KW - Pressure

KW - Reforming

KW - SOFCMAN

KW - Solid Oxide Cell Stack

U2 - 10.1016/j.est.2019.02.003

DO - 10.1016/j.est.2019.02.003

M3 - Journal article

AN - SCOPUS:85061199900

VL - 22

SP - 106

EP - 115

JO - Journal of Energy Storage

JF - Journal of Energy Storage

SN - 2352-152X

ER -