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      Hydrogen‐Substituted Graphdiyne Ion Tunnels Directing Concentration Redistribution for Commercial‐Grade Dendrite‐Free Zinc Anodes

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          Most cited references53

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          Relation between the ion size and pore size for an electric double-layer capacitor.

          The research on electrochemical double layer capacitors (EDLC), also known as supercapacitors or ultracapacitors, is quickly expanding because their power delivery performance fills the gap between dielectric capacitors and traditional batteries. However, many fundamental questions, such as the relations between the pore size of carbon electrodes, ion size of the electrolyte, and the capacitance have not yet been fully answered. We show that the pore size leading to the maximum double-layer capacitance of a TiC-derived carbon electrode in a solvent-free ethyl-methylimmidazolium-bis(trifluoro-methane-sulfonyl)imide (EMI-TFSI) ionic liquid is roughly equal to the ion size (approximately 0.7 nm). The capacitance values of TiC-CDC produced at 500 degrees C are more than 160 F/g and 85 F/cm(3) at 60 degrees C, while standard activated carbons with larger pores and a broader pore size distribution present capacitance values lower than 100 F/g and 50 F/cm(3) in ionic liquids. A significant drop in capacitance has been observed in pores that were larger or smaller than the ion size by just an angstrom, suggesting that the pore size must be tuned with sub-angstrom accuracy when selecting a carbon/ion couple. This work suggests a general approach to EDLC design leading to the maximum energy density, which has been now proved for both solvated organic salts and solvent-free liquid electrolytes.
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            Highly reversible zinc metal anode for aqueous batteries

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              Recent Advances in Zn-Ion Batteries

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                Author and article information

                Contributors
                Journal
                Advanced Materials
                Adv. Mater.
                Wiley
                0935-9648
                1521-4095
                June 2020
                May 14 2020
                June 2020
                : 32
                : 25
                : 2001755
                Affiliations
                [1 ]Department of Materials Science and EngineeringCity University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong SAR 999077 China
                [2 ]National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of China Hefei 230029 China
                [3 ]Center for Advanced Nuclear Safety and Sustainable DevelopmentCity University of Hong Kong Kowloon 999077 Hong Kong
                Article
                10.1002/adma.202001755
                b716f268-308f-4026-9e7c-7f57370055e8
                © 2020

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