Selective Ultrathin Carbon Sheath on Porous Silicon Nanowires: Materials for Extremely High Energy Density Planar Micro-Supercapacitors

Abstract

Microsupercapacitors are attractive energy storage devices for integration with autonomous microsensor networks due to their high-power capabilities and robust cycle lifetimes. Here, we demonstrate porous silicon nanowires synthesized via a lithography compatible low-temperature wet etch and encapsulated in an ultrathin graphitic carbon sheath, as electrochemical double layer capacitor electrodes. Specific capacitance values reaching 325 mF cm(-2) are achieved, representing the highest specific ECDL capacitance for planar microsupercapacitor electrode materials to date.

Advanced Ti‐Doped Fe2O3@PEDOT Core/Shell Anode for High‐Energy Asymmetric Supercapacitors

“…It can not only effectively improve the conductivity of nanomaterials, but also act as a protective layer to prevent the architectures from destruction/degradation. [26][27][28] Therefore, the exploration of new, stateof-the-art anode materials with high capacitance is still highly valuable and signifi cant. Such unique core/shell architectures can offer a high electrical conductivity of the overall electrode for charge transport, a large interfacial area for reaction, and numerous channels for rapid diffusion of electrolyte ions within the electrode, which endows the designed Ti-Fe 2 O 3 @PEDOT electrode with an excellent capacitive performance.…”

Template-grown graphene/porous Fe2O3 nanocomposite: A high-performance anode material for pseudocapacitors

“…Secondly, the tiny particle size of Fe 2 O 3 ensures sufficient surface area for redox reactions. Last, the pores among Fe 2 O 3 provide extensive contacts with the electrolyte ions [25][26][27]50]. Moreover, electrochemical impedance spectroscopy (EIS) measurements (Figures S10 and S11) were used to demonstrate the superiority of G-Fe 2 O 3 with low charge transfer impedance, high knee frequency, and low phase angle in comparison with the counterparts.…”

Solder-reflow resistant solid-state micro-supercapacitors based on ionogels

“…Silicon has recently been shown to be of some interest for use in electrodes for μSCs although the capacitances of the previously cited thin film electrodes (MnO 2 , RuO 2 , VN, ...) is  100 times higher than that of silicon based electrodes. carbon, 25 silicon carbide, 26 conductive polymer 27 or diamond. The capacitance of silicon can be increased by using 3D nanostructuring with silicon nanowires SiNWs) [19][20][21] and even silicon nanotrees (SiNTrs).…”