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Single-crystalline integrated 4H-SiC nanochannel array electrode: toward high-performance capacitive energy storage for robust wide-temperature operation

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Abstract

The exploration of energy conversion and storage devices for wide-temperature operation is presently a grand challenge. Herein, the single-crystalline integrated energy-storage units based on highly-oriented 4H-SiC nanochannel arrays (NCAs) were fabricated via an improved electrochemical anodic oxidation technique from 4H-SiC wafers. The as-prepared SiC NCAs electrode exhibits an areal capacitance of 14.8 mF cm−2 at 10 mV s−1, which is the highest for SiC electrodes ever reported and also 6-fold higher in comparison to that of SiC nanowire array electrode (NWAs, 2.32 mF cm−2). Moreover, the resultant 4H-SiC NCAs exhibit an extremely stable cycling performance in aqueous electrolytes, with higher than 95% retention of initial capacitance regardless of being serviced under low, high or cross-fade temperatures for 11 000 charge–discharge cycles, demonstrating that they are nearly full-featured for robust wide-temperature operation.

Graphical abstract: Single-crystalline integrated 4H-SiC nanochannel array electrode: toward high-performance capacitive energy storage for robust wide-temperature operation

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Publication details

The article was received on 22 Apr 2018, accepted on 03 Jul 2018 and first published on 03 Jul 2018


Article type: Communication
DOI: 10.1039/C8MH00474A
Citation: Mater. Horiz., 2018, Advance Article
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    Single-crystalline integrated 4H-SiC nanochannel array electrode: toward high-performance capacitive energy storage for robust wide-temperature operation

    W. Li, Q. Liu, S. Chen, Z. Fang, X. Liang, G. Wei, L. Wang, W. Yang, Y. Ji and L. Mai, Mater. Horiz., 2018, Advance Article , DOI: 10.1039/C8MH00474A

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