Ion transport from water-in-salt electrolyte through porosity of hierarchical porous carbons unraveled by solid-state NMR
Electrical double-layer capacitors bring numerous strengths to the energy storage landscape but have limited use due to their high unit energy cost and low specific energy. Water-in-salt electrolytes have been recently purported as an option to provide more affordable energy storage, but high viscos...
| Authors: | , , , , |
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| Format: | article |
| Status: | Versión aceptada para publicación |
| Publication Date: | 2021 |
| Country: | España |
| Institution: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repository: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/305058 |
| Online Access: | http://hdl.handle.net/10261/305058 https://api.elsevier.com/content/abstract/scopus_id/85121530854 |
| Access Level: | Open access |
| Keyword: | Electrical double-layer capacitor Hierarchical porous carbon Solid-state NMR Water-in-salt electrolyte |
| Summary: | Electrical double-layer capacitors bring numerous strengths to the energy storage landscape but have limited use due to their high unit energy cost and low specific energy. Water-in-salt electrolytes have been recently purported as an option to provide more affordable energy storage, but high viscosity and limited conductivity hinder their direct use in high-power devices such as capacitors. By using solid-state NMR and electrolyte-tuned porosity carbons, we demonstrate, at the molecular level, a drastic impact of relative pore/ion size on proper electrolyte propagation deep down the pore volume. The NMR results also provide a rationale for the radical changes in low-and high-rate electrochemical response observed using carbons with differently nanosized pores and a water-in-salt electrolyte. |
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