Journal article
Surveying Manganese Oxides as Electrode Materials for Harnessing Salinity Gradient Energy.
- Fortunato J Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.
- Peña J Institute of Earth Surface Dynamics, University of Lausanne, CH-1015 Lausanne, Switzerland.
- Benkaddour S Institute of Earth Surface Dynamics, University of Lausanne, CH-1015 Lausanne, Switzerland.
- Zhang H Department of Civil Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United States.
- Huang J Department of Civil Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United States.
- Zhu M Department of Ecosystem Science and Management, University of Wyoming, Laramie, Wyoming 82071, United States.
- Logan BE Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.
- Gorski CA Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.
- 2020-04-07
Published in:
- Environmental science & technology. - 2020
English
The potential energy contained in the controlled mixing of waters with different salt concentrations (i.e., salinity gradient energy) can theoretically provide a substantial fraction of the global electrical demand. One method for generating electricity from salinity gradients is to use electrode-based reactions in electrochemical cells. Here, we examined the relationship between the electrical power densities generated from synthetic NaCl solutions and the crystal structures and morphologies of manganese oxides, which undergo redox reactions coupled to sodium ion uptake and release. Our aim was to make progress toward developing rational frameworks for selecting electrode materials used to harvest salinity gradient energy. We synthesized 12 manganese oxides having different crystal structures and particle sizes and measured the power densities they produced in a concentration flow cell fed with 0.02 and 0.5 M NaCl solutions. Power production varied considerably among the oxides, ranging from no power produced (β-MnO2) to 1.18 ± 0.01 W/m2 (sodium manganese oxide). Power production correlated with the materials' specific capacities, suggesting that cyclic voltammetry may be a simple method to screen possible materials. The highest power densities were achieved with manganese oxides capable of intercalating sodium ions when their potentials were prepoised prior to power production.
- Language
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- English
- Open access status
- closed
- Identifiers
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- DOI 10.1021/acs.est.0c00096
- PMID 32250598
- Persistent URL
- https://sonar.ch/global/documents/54811
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