An Asymmetric Supercapacitor–Diode (CAPode) for Unidirectional Energy Storage

A new asymmetric capacitor concept is proposed providing high energy storage capacity for only one charging direction. Size‐selective microporous carbons (w2 nm), gives access to both ions. This architecture exclusively charges in one direction with high rectification ratios (RR=12), representing a...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2019-09, Vol.58 (37), p.13060-13065
Main Authors: Zhang, En, Fulik, Natalia, Hao, Guang‐Ping, Zhang, Han‐Yue, Kaneko, Katsumi, Borchardt, Lars, Brunner, Eike, Kaskel, Stefan
Format: Article
Language:English
Subjects:
Anions
Asymmetry
Cations
Charging
Diodes
electroadsorption
Electrodes
Energy storage
ion sieving
iontronics
Magnetic resonance spectroscopy
nanoporous carbon
NMR
NMR spectroscopy
Nuclear magnetic resonance
Pore size
Pore size distribution
Porosity
Size distribution
Storage capacity
supercapacitor
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Summary:A new asymmetric capacitor concept is proposed providing high energy storage capacity for only one charging direction. Size‐selective microporous carbons (w2 nm), gives access to both ions. This architecture exclusively charges in one direction with high rectification ratios (RR=12), representing a novel capacitive analogue of semiconductor‐based diodes (“CAPode”). By precise pore size control of microporous carbons (0.6 nm, 0.8 nm and 1.0 nm) combined with an ordered mesoporous counter electrode (CMK‐3, 4.8 nm) electrolyte cation sieving and unidirectional charging is demonstrated by analyzing the device charge‐discharge response and monitoring individual electrodes of the device via in situ NMR spectroscopy. Size matters: By coupling a carbon molecular sieve electrode with an ordered mesoporous carbon (CMK‐3), a new asymmetric capacitor concept with rectification function and high capacitance is realized. In situ NMR spectroscopy confirms the size exclusion and unidirectional charging mechanism.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201904888