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• W2093842022 abstract "This work describes the chemical activation of a coke using two different activating agents to investigate their behavior as electrodes in supercapacitors. A coke was chemically activated with two hydroxides (KOH and NaOH) under nitrogen flow, at a constant mass hydroxide/coke ratio of 2 and temperatures of 600, 650, and 700 °C. All of the samples were characterized in terms of porosity by N2 sorption at 77 K, surface chemistry by temperature-programmed desorption (TPD), and electrical conductivity. Their electrochemical behavior as electric double-layer capacitors was determined using galvanostatic, voltammetric, and impedance spectroscopy techniques in an aqueous medium with 1 M H2SO4 as the electrolyte. Large differences in capacitive behavior with the increase in the current density were found between the two series of activated samples. The different trends were correlated with the results obtained from the TPD analysis of the CO-type oxygen groups. It was found that these oxygen groups make a positive contribution to capacitance, finding a good correlation between the specific capacitance values, and the amount of these oxygen groups was found for both series." @default.
• W2093842022 created "2016-06-24" @default.
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• W2093842022 date "2010-03-02" @default.
• W2093842022 modified "2023-09-27" @default.
• W2093842022 title "Comparison between Electrochemical Capacitors Based on NaOH- and KOH-Activated Carbons" @default.
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• W2093842022 doi "https://doi.org/10.1021/ef901538m" @default.
• W2093842022 hasPublicationYear "2010" @default.
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