Three dimensional carbon-bubble foams with hierarchical pores for ultra-long cycling life supercapacitors

Bowen Wang, Weigang Zhang, Lei Wang, Jiake Wei, Xuedong Bai, Jingyue Liu, Guanhua Zhang, Huigao Duan

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Design and synthesis of integrated, interconnected porous structures are critical to the development of high-performance supercapacitors. We develop a novel and facile synthesis technic to construct three-dimensional carbon-bubble foams with hierarchical pores geometry. The carbon-bubble foams are fabricated by conformally coating, via catalytic decomposition of ethanol, a layer of carbon coating onto the surfaces of pre-formed ZnO foams and then the removal of the ZnO template by a reduction-evaporation process. Both the wall thickness and the pore size can be well tuned by adjusting the catalytic decomposition time and temperature. The as-synthesized carbon-bubble foams electrode retains 90.3% of the initial capacitance even after 70 000 continuous cycles under a high current density of 20 A g-1, demonstrating excellent long-time electrochemical and cycling stability. The symmetric device displays rate capability retention of 81.8% with the current density increasing from 0.4 to 20 A g-1. These achieved electrochemical performances originate from the unique structural design of the carbon-bubble foams, which provide not only abundant transport channels for electron and ion but also high active surface area accessible by the electrolyte ions.

Original languageEnglish (US)
Article number275706
JournalNanotechnology
Volume29
Issue number27
DOIs
StatePublished - May 8 2018

Keywords

  • ZnO template
  • carbon-bubble foams
  • catalytic conversion
  • hierarchical pores
  • supercapacitors

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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