Layered Silicon-Based Nanosheets as Electrode for 4 V High-Performance Supercapacitor

Runsheng Gao, Jie Tang, Xiaoliang Yu, Shiqi Lin, Kun Zhang, Lu Chang Qin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)

Abstract

Silicon-based materials have shown great potential and been widely studied in various fields. Unlike its unparalleled theoretical capacity as anodes for batteries, few investigations have been reported on silicon-based materials for applications in supercapacitors. Here, an electrode composed of layered silicon-based nanosheets, obtained through oxidation and exfoliation, for a supercapacitor operated up to 4 V is reported. These silicon-based nanosheets show an areal specific capacitance of 4.43 mF cm−2 at 10 mV s−1 while still retaining a specific capacitance of 834 µF cm−2 even at an ultrahigh scan rate of 50 000 mV s−1. The volumetric energy and power density of the supercapacitor are 7.65 mWh cm−3 and 9312 mW cm−3, respectively, and the electrode can operate for 12000 cycles in a potential window of 4 V at 2 A g−1, while retaining 90.6% capacitance. These results indicate that the silicon-based nanosheets can be a competitive candidate as the supercapacitor electrode material.

Original languageEnglish
Article number2002200
JournalAdvanced Functional Materials
Volume30
Issue number27
DOIs
Publication statusPublished - 1 Jul 2020
Externally publishedYes

Keywords

  • high voltage
  • layered structures
  • silicon-based nanosheets
  • supercapacitors

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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