H2O splitting via a two-step solar thermoelectrolytic cycle based on non-stoichiometric ceria redox reactions: Thermodynamic analysis

Garrett L. Schieber; Ellen Stechel; Andrea Ambrosini; James E. Miller; Peter G. Loutzenhiser

doi:10.1016/j.ijhydene.2017.06.098

H₂O splitting via a two-step solar thermoelectrolytic cycle based on non-stoichiometric ceria redox reactions: Thermodynamic analysis

Garrett L. Schieber, Ellen Stechel, Andrea Ambrosini, James E. Miller, Peter G. Loutzenhiser

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

H₂ production via a novel two-step solar thermoelectrolytic cycle based on non-stoichiometric ceria reduction/oxidation reactions is thermodynamically analyzed. The two-step cycle encompasses (1) the solar thermoelectrolytic reduction of ceria using a combination of concentrated solar irradiation, reduced partial pressure, and electricity from a photovoltaic array to increase the oxygen vacancy concentration in the sublattice and (2) the non-solar oxidation of non-stoichiometric ceria with H₂O to produce H₂, or CO₂ to produce CO. The re-oxidized ceria is returned to the first step to complete the cycle. A thermodynamic analysis that imposes first and second law constraints to determine optimal performance predicts a solar-to-fuel efficiency of 31.1% for a reduction temperature of 1424 K and a maximum oxygen vacancy concentration of 0.229.

Original language	English (US)
Pages (from-to)	18785-18793
Number of pages	9
Journal	International Journal of Hydrogen Energy
Volume	42
Issue number	30
DOIs	https://doi.org/10.1016/j.ijhydene.2017.06.098
State	Published - Jul 27 2017

Keywords

Ceria
H production
Solar thermoelectrolytic cycle

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Fuel Technology
Condensed Matter Physics
Energy Engineering and Power Technology

Access to Document

10.1016/j.ijhydene.2017.06.098

Cite this

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title = "H2O splitting via a two-step solar thermoelectrolytic cycle based on non-stoichiometric ceria redox reactions: Thermodynamic analysis",

abstract = "H2 production via a novel two-step solar thermoelectrolytic cycle based on non-stoichiometric ceria reduction/oxidation reactions is thermodynamically analyzed. The two-step cycle encompasses (1) the solar thermoelectrolytic reduction of ceria using a combination of concentrated solar irradiation, reduced partial pressure, and electricity from a photovoltaic array to increase the oxygen vacancy concentration in the sublattice and (2) the non-solar oxidation of non-stoichiometric ceria with H2O to produce H2, or CO2 to produce CO. The re-oxidized ceria is returned to the first step to complete the cycle. A thermodynamic analysis that imposes first and second law constraints to determine optimal performance predicts a solar-to-fuel efficiency of 31.1% for a reduction temperature of 1424 K and a maximum oxygen vacancy concentration of 0.229.",

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T1 - H2O splitting via a two-step solar thermoelectrolytic cycle based on non-stoichiometric ceria redox reactions

T2 - Thermodynamic analysis

AU - Schieber, Garrett L.

AU - Stechel, Ellen

AU - Ambrosini, Andrea

AU - Miller, James E.

AU - Loutzenhiser, Peter G.

PY - 2017/7/27

Y1 - 2017/7/27

N2 - H2 production via a novel two-step solar thermoelectrolytic cycle based on non-stoichiometric ceria reduction/oxidation reactions is thermodynamically analyzed. The two-step cycle encompasses (1) the solar thermoelectrolytic reduction of ceria using a combination of concentrated solar irradiation, reduced partial pressure, and electricity from a photovoltaic array to increase the oxygen vacancy concentration in the sublattice and (2) the non-solar oxidation of non-stoichiometric ceria with H2O to produce H2, or CO2 to produce CO. The re-oxidized ceria is returned to the first step to complete the cycle. A thermodynamic analysis that imposes first and second law constraints to determine optimal performance predicts a solar-to-fuel efficiency of 31.1% for a reduction temperature of 1424 K and a maximum oxygen vacancy concentration of 0.229.

AB - H2 production via a novel two-step solar thermoelectrolytic cycle based on non-stoichiometric ceria reduction/oxidation reactions is thermodynamically analyzed. The two-step cycle encompasses (1) the solar thermoelectrolytic reduction of ceria using a combination of concentrated solar irradiation, reduced partial pressure, and electricity from a photovoltaic array to increase the oxygen vacancy concentration in the sublattice and (2) the non-solar oxidation of non-stoichiometric ceria with H2O to produce H2, or CO2 to produce CO. The re-oxidized ceria is returned to the first step to complete the cycle. A thermodynamic analysis that imposes first and second law constraints to determine optimal performance predicts a solar-to-fuel efficiency of 31.1% for a reduction temperature of 1424 K and a maximum oxygen vacancy concentration of 0.229.

KW - Ceria

KW - H production

KW - Solar thermoelectrolytic cycle

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