Thermodynamic stability of LuRhO3 in a photoelectrochemical cell
Jacob, K. T. and Ramesh, Sankaran LU
(2017)
In Journal of Alloys and Compounds
695.
p.1891-1899
- Abstract
Long term stability of lutetium rhodite (LuRhO3) as an electrode for photoelectrochemical decomposition of water is investigated. The thermodynamic properties of LuRhO3are determined in the temperature range from 875 to 1300 K using an electrochemical cell incorporating calcia–stabilized zirconia as the solid electrolyte. The standard Gibbs energy of formation of LuRhO3from its constituent binary oxides Lu2O3with C-type rare earth oxide crystal structure and Rh2O3with orthorhombic structure is obtained: ΔGf,ox o(±135)/Jmol−1=−40106+3.282(T/K) The standard entropy of... (More)
Long term stability of lutetium rhodite (LuRhO3) as an electrode for photoelectrochemical decomposition of water is investigated. The thermodynamic properties of LuRhO3are determined in the temperature range from 875 to 1300 K using an electrochemical cell incorporating calcia–stabilized zirconia as the solid electrolyte. The standard Gibbs energy of formation of LuRhO3from its constituent binary oxides Lu2O3with C-type rare earth oxide crystal structure and Rh2O3with orthorhombic structure is obtained: ΔGf,ox o(±135)/Jmol−1=−40106+3.282(T/K) The standard entropy of LuRhO3S298.15K o(LuRhO3)/JK-1mol-1=89.54(±0.35) and standard enthalpy of formation from elements ΔHf o(298.15K)/kJmol−1=−1181.97(±3.86) are derived. The phase relations and stabilities of phases in the Lu[sbnd]Rh[sbnd]O system are computed from thermodynamic data. An isothermal section of the ternary phase diagram, a 2–D oxygen potential diagram and a 3–D chemical potential diagram at 1200 K are presented along with temperature–composition phase diagrams at various oxygen partial pressures of oxygen. LuRhO3(p-type) is thermodynamically unstable as a photocathode in contact with hydrogen gas. However, n-type LuRhO3can be used as a photoanode in the presence of oxygen.
(Less)
- author
- Jacob, K. T.
and Ramesh, Sankaran
LU
- publishing date
- 2017
- type
- Contribution to journal
- publication status
- published
- keywords
- Enthalpy, Entropy, Gibbs energy, Lutetium rhodite, Phase diagram, System Lu–Rh–O
- in
- Journal of Alloys and Compounds
- volume
- 695
- pages
- 9 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:85006812877
- ISSN
- 0925-8388
- DOI
- 10.1016/j.jallcom.2016.10.325
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2016 Elsevier B.V.
- id
- ad080305-e524-4156-81eb-30c09ba19196
- date added to LUP
- 2023-02-15 22:21:24
- date last changed
- 2023-03-06 13:12:45
@article{ad080305-e524-4156-81eb-30c09ba19196,
abstract = {{<p>Long term stability of lutetium rhodite (LuRhO<sub>3</sub>) as an electrode for photoelectrochemical decomposition of water is investigated. The thermodynamic properties of LuRhO<sub>3</sub>are determined in the temperature range from 875 to 1300 K using an electrochemical cell incorporating calcia–stabilized zirconia as the solid electrolyte. The standard Gibbs energy of formation of LuRhO<sub>3</sub>from its constituent binary oxides Lu<sub>2</sub>O<sub>3</sub>with C-type rare earth oxide crystal structure and Rh<sub>2</sub>O<sub>3</sub>with orthorhombic structure is obtained: ΔG<sub>f,ox</sub> <sup>o</sup>(±135)/Jmol<sup>−1</sup>=−40106+3.282(T/K) The standard entropy of LuRhO<sub>3</sub>S<sub>298.15K</sub> <sup>o</sup>(LuRhO<sub>3</sub>)/JK<sup>-1</sup>mol<sup>-1</sup>=89.54(±0.35) and standard enthalpy of formation from elements ΔH<sub>f</sub> <sup>o</sup>(298.15K)/kJmol<sup>−1</sup>=−1181.97(±3.86) are derived. The phase relations and stabilities of phases in the Lu[sbnd]Rh[sbnd]O system are computed from thermodynamic data. An isothermal section of the ternary phase diagram, a 2–D oxygen potential diagram and a 3–D chemical potential diagram at 1200 K are presented along with temperature–composition phase diagrams at various oxygen partial pressures of oxygen. LuRhO<sub>3</sub>(p-type) is thermodynamically unstable as a photocathode in contact with hydrogen gas. However, n-type LuRhO<sub>3</sub>can be used as a photoanode in the presence of oxygen.</p>}},
author = {{Jacob, K. T. and Ramesh, Sankaran}},
issn = {{0925-8388}},
keywords = {{Enthalpy; Entropy; Gibbs energy; Lutetium rhodite; Phase diagram; System Lu–Rh–O}},
language = {{eng}},
pages = {{1891--1899}},
publisher = {{Elsevier}},
series = {{Journal of Alloys and Compounds}},
title = {{Thermodynamic stability of LuRhO<sub>3</sub> in a photoelectrochemical cell}},
url = {{http://dx.doi.org/10.1016/j.jallcom.2016.10.325}},
doi = {{10.1016/j.jallcom.2016.10.325}},
volume = {{695}},
year = {{2017}},
}