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Carbonization of polymers of intrinsic microporosity to microporous heterocarbon: Capacitive pH measurements AITranslate

Naiara Hernandez; Jesus Iniesta; Vicente Montiel Leguey; Robert Armstrong; Stuart H. Taylor; Elena Madrid; Yuanyang Rong; Rémi Castaing; Richard MalpassEvans; Mariolino Carta; Neil B. McKeown; Frank Marken;
Universidad de Alicante; Universidad de Alicante; Universidad de Alicante; Cardiff University; Cardiff University; University of Bath; University of Bath; University of Bath; University of Edinburgh; University of Edinburgh; University of Edinburgh; University of Bath
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Publisher: Elsevier
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Abstract AITranslate

A nitrogen-containing polymer of intrinsic microporosity (PIM-EA-TB-H2; nitrogen adsorption surface area 846 m2 g−1) is vacuum carbonized at 700 °C and thereby directly without post-treatment converted into a microporous heterocarbon (cPIM; N2 adsorption surface area 425 m2 g−1). Nitrogen functionalities in the polymer backbone are retained in the heterocarbon and appear responsible for unusual time-, electrolyte-, and pH-dependent properties. Electrochemical characterization suggests a high specific capacitance (typically 50 F g−1) but only after prolonged immersion in aqueous HClO4. The time-dependent increase in capacitance during immersion is assigned to slow hydration and ingress of HClO4 into hydrophobic micropores (H2SO4 or H3PO4 are more hydrophilic and much less effective). Once hydrated, the microporous heterocarbon exhibits pH-dependent capacitance “switching” over a wide pH range and analytical applications as “capacitive” pH sensor are proposed. Graphical abstract Download : Download high-res image (155KB) Download : Download full-size image

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DOI：https://doi.org/10.1016/j.apmt.2017.06.003

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Citation Information:

A nitrogen-containing polymer of intrinsic microporosity (PIM-EA-TB-H2; nitrogen adsorption surface area 846 m2 g−1) is vacuum carbonized at 700 °C and thereby directly without post-treatment converted into a microporous heterocarbon (cPIM; N2 adsorption surface area 425 m2 g−1). Nitrogen functionalities in the polymer backbone are retained in the heterocarbon and appear responsible for unusual time-, electrolyte-, and pH-dependent properties. Electrochemical characterization suggests a high specific capacitance (typically 50 F g−1) but only after prolonged immersion in aqueous HClO4. The time-dependent increase in capacitance during immersion is assigned to slow hydration and ingress of HClO4 into hydrophobic micropores (H2SO4 or H3PO4 are more hydrophilic and much less effective). Once hydrated, the microporous heterocarbon exhibits pH-dependent capacitance “switching” over a wide pH range and analytical applications as “capacitive” pH sensor are proposed. Graphical abstract Download : Download high-res image (155KB) Download : Download full-size image

quote

GB/T 7714-2015 [1] Naiara Hernandez, Jesus Iniesta, Vicente Montiel Leguey, et al. Applied Materials Today, 2017(9). DOI:10.1016/j.apmt.2017.06.003.
MLA [1] Naiara Hernandez, et al., Applied Materials Today, no. 9, 2017, https://doi.org/10.1016/j.apmt.2017.06.003.
APA [1] Naiara Hernandez, Jesus Iniesta, Vicente Montiel Leguey, Robert Armstrong, Stuart H. Taylor, Elena Madrid, Yuanyang Rong, Rémi Castaing, Richard MalpassEvans, Mariolino Carta, Neil B. McKeown, & Frank Marken. (2017). Applied Materials Today(9). https://doi.org/10.1016/j.apmt.2017.06.003
IEEE [1] Naiara Hernandez, Jesus Iniesta, Vicente Montiel Leguey, Robert Armstrong, Stuart H. Taylor, Elena Madrid, Yuanyang Rong, Rémi Castaing, Richard MalpassEvans, Mariolino Carta, Neil B. McKeown, and Frank Marken, Applied Materials Today, no. 9, 2017, doi: 10.1016/j.apmt.2017.06.003.