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

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Single-crystalline integrated 4H-SiC nanochannel array electrode: toward high-performance capacitive energy storage for robust wide-temperature operation†
Materials Horizons ( IF 12.2 ) Pub Date : 2018-07-03 00:00:00 , DOI: 10.1039/c8mh00474a
Weijun Li _{1,

2,

3,

4,

5} , Qiao Liu _{4,

5,

6,

7} , Shanliang Chen _{4,

5,

6,

7} , Zhi Fang _{4,

5,

6,

7} , Xu Liang _{1,

2,

3,

4} , Guodong Wei _{1,

2,

3,

4} , Lin Wang _{4,

5,

6,

7} , Weiyou Yang _{4,

5,

6,

7} , Yuan Ji _{1,

2,

3,

4} , Liqiang Mai _{8,

9,

10,

11,

12}

Affiliation

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.

中文翻译：

单晶集成4H-SiC纳米通道阵列电极：面向高性能电容性储能，可实现稳定的宽温度运行†

目前，探索用于宽温度运行的能量转换和存储设备是一个巨大的挑战。在本文中，通过改进的电化学阳极氧化技术，从4H-SiC晶片制造了基于高度取向的4H-SiC纳米通道阵列（NCA）的单晶集成储能单元。所制备的SiC NCAs电极在10 mV s ^-1处具有14.8 mF cm ^-2的面积电容，这是有史以来报道的SiC电极中最高的，并且比SiC纳米线阵列电极（NWAs）高出6倍。，2.32 mF厘米^-2）。此外，所得的4H-SiC NCA在水性电解质中表现出极其稳定的循环性能，无论在低，高或淡入淡出的温度下进行11 000次充放电循环，其初始电容保持率均高于95％，这表明它们几乎具有全功能，可在强大的宽温度下运行。

更新日期：2018-07-03

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