کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6470484 | 1424111 | 2017 | 8 صفحه PDF | دانلود رایگان |
- Carbide derived carbon (CDC) films were modified with anthraquinone (AQ) species.
- Electrochemical grafting of AQ was achieved in microporous carbon for the first time.
- 0.88 Ã 10â10 mol cmâ2 of AQ were grafted to 700 °C chlorinated on-chip CDC thin film.
- The total capacitance of the micro-supercapacitor electrodes was doubled in 1Â M KOH.
- AQ grafting opens the way for an increase of CDC electrode capacitance
The modification of carbide derived carbon (CDC) thin film electrodes with anthraquinone (AQ) molecules was demonstrated by using pulsed chronoamperometry, in 0.1Â M NEt4BF4/ACN solution of AQ diazonium derivative. The functionalization of CDC electrodes was only possible when a critical pore size is reached: only 2Â nm pore diameter CDC can be grafted with AQ moieties, smaller pore size leading to a poorly functionalized electrode. High AQ surface coverage of 0.88Â ÃÂ 10â10Â mol.cmâ2 was determined using 2Â nm pore size CDC. Despite a decrease in double layer capacitance value of about 10%, the total capacitance of the AQ-modified on-chip CDC electrodes was twice larger than that of pristine CDC film, leading to high total capacitance value of 44 mF.cmâ2 (338Â F.cmâ3). The cyclability of the AQ-modified on-chip CDC electrode was also investigated. The faradic contribution of AQ grafted molecules progressively decreased during cycling and only 39% of the normalized capacity remained after 500 cycles; this decrease has been assigned to electrostatic repulsion of dianionic AQ confined in narrow micropores in the alkaline media.
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Journal: Electrochimica Acta - Volume 246, 20 August 2017, Pages 391-398