Intrinsically Microporous Polymer Retains Porosity in Vacuum Thermolysis to Electroactive Heterocarbon

Yuanyang Rong, Daping He, Adrian Sanchez-Fernandez, Craig Evans, Karen J. Edler, Richard Malpass-Evans, Mariolino Carta, Neil B. McKeown, Tomos J. Clarke, Stuart H. Taylor, Andrew J. Wain, John M. Mitchels, Frank Marken*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Vacuum carbonization of organic precursors usually causes considerable structural damage and collapse of morphological features. However, for a polymer with intrinsic microporosity (PIM-EA-TB with a Brunauer-Emmet-Teller (BET) surface area of 1027 m(2)g(-1)), it is shown here that the rigidity of the molecular backbone is retained even during 500 °C vacuum carbonization, yielding a novel type of microporous heterocarbon (either as powder or as thin film membrane) with properties between those of a conducting polymer and those of a carbon. After carbonization, the scanning electron microscopy (SEM) morphology and the small-angle X-ray scattering (SAXS) Guinier radius remain largely unchanged as does the cumulative pore volume. However, the BET surface area is decreased to 242 m(2)g(-1), but microporosity is considerably increased. The new material is shown to exhibit noticeable electrochemical features including two pH-dependent capacitance domains switching from ca. 33 Fg(-1) (when oxidized) to ca. 147 Fg(-1) (when reduced), a low electron transfer reactivity toward oxygen and hydrogen peroxide, and a four-point-probe resistivity (dry) of approximately 40 MΩ/square for a 1-2 μm thick film.

Original languageEnglish
Pages (from-to)12300-12306
Number of pages7
JournalLangmuir
Volume31
Issue number44
DOIs
Publication statusPublished - 10 Nov 2015

Keywords

  • SCANNING ELECTROCHEMICAL MICROSCOPY
  • HIERARCHICALLY POROUS CARBON
  • METAL-ORGANIC FRAMEWORK
  • ENERGY-STORAGE
  • GAS SEPARATION
  • PERFORMANCE SUPERCAPACITORS
  • NANOPOROUS CARBON
  • GRAPHENE
  • ELECTRODES
  • MEMBRANES

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