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

Abstract

The electrode nearly full-featured for robust wide-temperature operation based on single-crystalline integrated 4H-SiC nanochannel arrays was explored.

Robust High‐Temperature Supercapacitors Based on SiC Nanowires

“…[ 25 ] The EDX spectrum (Figure S4, Supporting Information) of sample SiC‐2.5 h discloses that the nanowires primarily contain C, Si, N, and O elements, in which Cu comes from the copper grid used to support the samples, and O originates from the intermediate product of SiO 2 as well as the formed residual oxygen‐containing functional groups over the etching process. [ 16,25 ] Accordingly, the N doping concentration is identified to be of ≈3.07 at%. The incorporated N dopants could fundamentally improve their electrical conductivity, favoring an enhanced performance for electrochemical energy storage.…”

“…For exploring robust high‐temperature SCs, one of the crucial points is the rational design of electrode, since it has to endure the significantly enhanced convection of the electrolyte induced by high temperatures, which would cause the structural collapse of the active materials and/or exfoliation of active materials from current collector, leading to the performance degradation and even failure of the device. [ 15,16 ]…”

“…Due to overall excellent physical/chemical properties (e.g., low thermal expansion coefficient, high electron mobility, good thermal shock resistance, excellent chemical stability), [ 17,18 ] the third‐generation semiconductor of silicon carbon (SiC) is considered as an ideal candidate material for exploring opto/electronic devices against harsh working conditions. [ 16,19,20 ] Recently, the SiC nanostructures used as the electrodes for SCs have been emerging as an interesting topic, representing their potential applications in energy storage. For instance, Alper et al.…”

“…[ 23 ] reported the all‐solid‐state SCs based on N ‐doped SiC nanowires, allowing for the operations at ultrahigh rate up to 30 V s –1 , which was two orders of magnitude higher than those of conventional SCs; Li et al. [ 16 ] reported the fabrication of SCs based on single‐crystalline 4 H ‐SiC electrodes, which behaved a stable cycling performance with a capacitance retention more than 95% for 11 000 cycles over the wide‐temperature range from −10 to 60 °C; Li et al. [ 24 ] reported all‐solid‐state on‐chip SCs based on SiC nanowire arrays with superior performance to those of conventional micro SCs.…”

Fabrication of Macroporous Biomorphic SiC from Cellulose Nanofibers Aerogel

“…That makes porous BioSiC a prominent candidate for applications as filtration media, catalyst support, electrode, etc. [8,9,10,11]. Despite many successes, BioSiC derived directly from nature wood template has been suffering from unsatisfied permeability and interconnectivity.…”