Extending Electrochemical Quartz Crystal Microbalance Techniques to Macroscale Electrodes: Insights on Pseudocapacitance Mechanisms in MnOx-Coated Carbon Nanofoams
| Autor: | Jeffrey W. Long, Christopher A. Beasley, Megan B. Sassin |
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| Rok vydání: | 2015 |
| Předmět: |
Renewable Energy
Sustainability and the Environment chemistry.chemical_element Nanotechnology Creative commons Quartz Crystal Microbalance Techniques Condensed Matter Physics Electrochemistry Pseudocapacitance Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion chemistry Electrode Materials Chemistry Carbon Nanofoam |
| Zdroj: | Journal of The Electrochemical Society. 162:A5060-A5064 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/2.0091505jes |
| Popis: | ElectrochemicalquartzcrystalmicrobalancestudiesofMnOx-coatedcarbonnanofoamsrevealthatcharge-compensationmechanisms associated with MnOx pseudocapacitance in mild aqueous electrolytes are dominated by anion insertion rather than more commonly reported cation ejection. Specific charge-compensation behavior depends on such factors as electrolyte composition, nanofoam pore size, andpolarizationamplitude.Forexample,MnOx‐carbonnanofoamswithaverageporesizes of5‐20nm,cycledin2.5MLiNO3, reveal a kinetically-hindered, mixed anion-cation charge-compensation mechanism, whereas the same nanofoam cycled in 2.5 M NaNO3 shows only anion association. Nanofoams with larger pores (10‐200 nm) that are cycled in 2.5 M LiNO3, reveal anion-only charge compensation. Our results demonstrate that critical new insights on charge-storage mechanisms are achieved using EQCM methods, even when analyzing practical, macroscale electrodes such as carbon nanofoams. © The Author(s) 2015. Published by ECS. This is an open access article distributed under the terms of the Creative Commons |
| Databáze: | OpenAIRE |
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