Intrinsically Microporous Polymer Retains Porosity in Vacuum Thermolysis to Electroactive Heterocarbon

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• 作者：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
• 刊名：Langmuir
• 出版年：2015
• 出版时间：November 10, 2015
• 年：2015
• 卷：31
• 期：44
• 页码：12300-12306
• 全文大小：522K
• ISSN：1520-5827

文摘

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鈥揈mmet鈥揟eller (BET) surface area of 1027 m²g^鈥?), it is shown here that the rigidity of the molecular backbone is retained even during 500 掳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 m²g^鈥?, 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^鈥? (when oxidized) to ca. 147 Fg^鈥? (when reduced), a low electron transfer reactivity toward oxygen and hydrogen peroxide, and a four-point-probe resistivity (dry) of approximately 40 M惟/square for a 1鈥? 渭m thick film.