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

Zhang E, Fulik N, Hao GP, Zhang HY, Kaneko K, Borchardt L, Brunner E, Kaskel S (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Angewandte Chemie International Edition Wiley

Book Volume: 58

Pages Range: 13060-13065

Journal Issue: 37

DOI: 10.1002/anie.201904888

Abstract

A new asymmetric capacitor concept is proposed providing high energy storage capacity for only one charging direction. Size-selective microporous carbons (w<0.9 nm) with narrow pore size distribution are demonstrated to exclusively electrosorb small anions (BF4−) but size-exclude larger cations (TBA+ or TPA+), while the counter electrode, an ordered mesoporous carbon (w>2 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.

Involved external institutions

Technische Universität Dresden DE Germany (DE) Shinshu University / 信州大学 JP Japan (JP)

How to cite

APA:

Zhang, E., Fulik, N., Hao, G.-P., Zhang, H.-Y., Kaneko, K., Borchardt, L.,... Kaskel, S. (2019). An Asymmetric Supercapacitor–Diode (CAPode) for Unidirectional Energy Storage. Angewandte Chemie International Edition, 58(37), 13060-13065. https://doi.org/10.1002/anie.201904888

MLA:

Zhang, En, et al. "An Asymmetric Supercapacitor–Diode (CAPode) for Unidirectional Energy Storage." Angewandte Chemie International Edition 58.37 (2019): 13060-13065.

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