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Buchanan CA, Ko E, Cira S, Balasubramanian M, Goldsmith BR, Singh N. Structures and Free Energies of Cerium Ions in Acidic Electrolytes. Inorg Chem 2020; 59:12552-12563. [PMID: 32845625 DOI: 10.1021/acs.inorgchem.0c01645] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The Ce3+/Ce4+ redox potential changes with the electrolyte, which could be due to unequal anion complexation free energies between Ce3+ and Ce4+ or a change in the solvent electrostatic screening. Ce complexation with anions and solvent screening also affect the solubility of Ce and charge transfer kinetics for electrochemical reactions involving waste remediation and energy storage. We report the structures and free energies of cerium complexes in seven acidic electrolytes based on Extended X-ray Absorption Fine Structure, UV-vis, and Density Functional Theory calculations. Ce3+ coordinates with nine water molecules as [Ce(H2O)9]3+ in all studied electrolytes. However, Ce4+ complexes with anions in all electrolytes except HClO4. Thus, our results suggest that Ce4+-anion complexation leads to the large shifts in standard redox potential. Long range screening effects are smaller than the anion complexation energies but could be responsible for changes in the Ce solubility with acid.
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Affiliation(s)
- Cailin A Buchanan
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.,Catalysis Science and Technology Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Eunbyeol Ko
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.,Catalysis Science and Technology Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Spencer Cira
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Mahalingam Balasubramanian
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Bryan R Goldsmith
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.,Catalysis Science and Technology Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Nirala Singh
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.,Catalysis Science and Technology Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
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