Predicting Thermochemical Equilibria with Interacting Defects: Alloys for Water Splitting
Abstract
Solar thermochemical hydrogen is one of the few potential routes towards direct fuel production from renewable energy sources, but the thermodynamic boundary conditions for efficient and economic energy conversion are challenging. Success or failure of a given oxide working material depends on the subtle balance between enthalpy and entropy contributions in the redox processes. Developing a mechanistic understanding of the behavior of materials on the basis of atomistic models and first-principles calculations is an important part of advancing the technology. One challenge is to quantitatively predict thermochemical equilibria at high concentrations when the redox-active defects start to interact with each other, thereby impeding the formation of additional defects. This problem is of more general importance to applications that rely on high levels of off-stoichiometry or doping, including, for example, batteries, thermoelectrics, and ceramic fuel cells. To account for such repulsive defect interactions, we introduce a statistical mechanics approach, defining an expression for the free energy of defect interaction based on limited sampling of defect configurations in density functional theory supercell calculations. The parameterization of this energy contribution as a function of defect concentration and temperature allows on-the-fly simulation of thermochemical equilibria. The approach consistently incorporates finite temperature effects by includingmore »
- Authors:
- Publication Date:
- Research Org.:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Hydrogen Fuel Cell Technologies Office (HFTO)
- OSTI Identifier:
- 2305765
- Alternate Identifier(s):
- OSTI ID: 2316013
- Report Number(s):
- NREL/JA-5K00-87302
Journal ID: ISSN 2768-5608; 013008
- Grant/Contract Number:
- AC36-08GO28308
- Resource Type:
- Published Article
- Journal Name:
- PRX Energy
- Additional Journal Information:
- Journal Name: PRX Energy Journal Volume: 3 Journal Issue: 1; Journal ID: ISSN 2768-5608
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 08 HYDROGEN; defect equilibria; density functional theory; solar thermochemical hydrogen
Citation Formats
Goyal, Anuj, Sanders, Michael D., O’Hayre, Ryan P., and Lany, Stephan. Predicting Thermochemical Equilibria with Interacting Defects: Sr 1 − x Ce x Mn O 3 − δ Alloys for Water Splitting. United States: N. p., 2024.
Web. doi:10.1103/PRXEnergy.3.013008.
Goyal, Anuj, Sanders, Michael D., O’Hayre, Ryan P., & Lany, Stephan. Predicting Thermochemical Equilibria with Interacting Defects: Sr 1 − x Ce x Mn O 3 − δ Alloys for Water Splitting. United States. https://doi.org/10.1103/PRXEnergy.3.013008
Goyal, Anuj, Sanders, Michael D., O’Hayre, Ryan P., and Lany, Stephan. Fri .
"Predicting Thermochemical Equilibria with Interacting Defects: Sr 1 − x Ce x Mn O 3 − δ Alloys for Water Splitting". United States. https://doi.org/10.1103/PRXEnergy.3.013008.
@article{osti_2305765,
title = {Predicting Thermochemical Equilibria with Interacting Defects: Sr 1 − x Ce x Mn O 3 − δ Alloys for Water Splitting},
author = {Goyal, Anuj and Sanders, Michael D. and O’Hayre, Ryan P. and Lany, Stephan},
abstractNote = {Solar thermochemical hydrogen is one of the few potential routes towards direct fuel production from renewable energy sources, but the thermodynamic boundary conditions for efficient and economic energy conversion are challenging. Success or failure of a given oxide working material depends on the subtle balance between enthalpy and entropy contributions in the redox processes. Developing a mechanistic understanding of the behavior of materials on the basis of atomistic models and first-principles calculations is an important part of advancing the technology. One challenge is to quantitatively predict thermochemical equilibria at high concentrations when the redox-active defects start to interact with each other, thereby impeding the formation of additional defects. This problem is of more general importance to applications that rely on high levels of off-stoichiometry or doping, including, for example, batteries, thermoelectrics, and ceramic fuel cells. To account for such repulsive defect interactions, we introduce a statistical mechanics approach, defining an expression for the free energy of defect interaction based on limited sampling of defect configurations in density functional theory supercell calculations. The parameterization of this energy contribution as a function of defect concentration and temperature allows on-the-fly simulation of thermochemical equilibria. The approach consistently incorporates finite temperature effects by including the leading contributions to the temperature-dependent free energy for the case at hand, i.e., the ideal gas and configurational enthalpies and entropies. We demonstrate the capability and utility of the approach by simulating the water splitting redox processes for Sr1-xCexMnO3-δ alloys.},
doi = {10.1103/PRXEnergy.3.013008},
journal = {PRX Energy},
number = 1,
volume = 3,
place = {United States},
year = {Fri Feb 16 00:00:00 EST 2024},
month = {Fri Feb 16 00:00:00 EST 2024}
}
https://doi.org/10.1103/PRXEnergy.3.013008
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