Single-Step Preparation of Ultrasmall Iron Oxide-Embedded Carbon Nanotubes on Carbon Cloth with Excellent Superhydrophilicity and Enhanced Supercapacitor Performance

Yuan Wang, Jianfei Xiao, Tian Zhang, Like Ouyang, Shaojun Yuan

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Nanocomposites consisting of carbon materials and metal oxides are generally preferred as anodes in electrochemical energy storage. However, their low capacitance limits the achieved energy density of supercapacitors (SCs) in aqueous electrolytes. Herein, we propose a rapid combustion strategy to construct a novel electrode architecture—ultrasmall Fe2O3anchoring on carbon nanotubes (FeO-CNT)—as a superhydrophilic and flexible anode for SCs. In 1 M Na2SO4aqueous electrolyte, such an FeO-CNT-20 anode presents a high capacitance of 483.4 mF cm-2(326 F g-1) at 1 mA cm-2. The aqueous asymmetric supercapacitor devices (ASCs) assembled by FeO-CNT-20 and MnO2present a maximum operating potential of 2.0 V with a high areal energy density of 0.11 mWh cm-2at a power density of 0.5 mW cm-2. The flexible solid-state ASCs display an energy density of 0.99 mWh cm-3at 14.3 mW cm-3. The rapidly prepared FeO-CNT not only offers an attractive electrode for SCs but also would open up exciting new avenues to the rational design and large-scale preparation of Fe2O3-based nanocomposites for electrochemical energy storage.

Original languageEnglish (US)
Pages (from-to)45670-45678
Number of pages9
JournalACS Applied Materials and Interfaces
Volume13
Issue number38
DOIs
StatePublished - Sep 29 2021

Keywords

  • asymmetric
  • carbon nanotubes
  • flexible supercapacitor
  • superhydrophilic
  • ultrasmall Fe2O3 nanoparticles

ASJC Scopus subject areas

  • Materials Science(all)

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