The excellent rate capacitive features and competent CO2 capture performance of porous N-doped C(N) material

Fan-Ming Yang, Zi-Guang Xiong and Guo-Wen He

Applied Energy, 2024, vol. 367, issue C, No S0306261924008092

Abstract: N-doped porous carbons of C(N)-n were prepared for remarkable rate capacitive properties and excellent CO2 capture performance using Chitosan as both carbon and nitrogen sources. At the edge of amorphous C(N)-n materials, a part of atoms are arranged ordered on account of the graphitization. Besides, the optimal ID/IG ratio is 1.02. In the optimized sample of C(N)-700, N element exists in the framework as pyridinic N, pyrrodic N, quaternary N, oxidized N and the proportion is 7.3%. Moreover, the specific surface area and pore volume reach 243 m2/g and 0.633 cm3/g, respectively. In 6 M KOH, the C(N)-700 material generates a pseudocapacitance along with the double-layer capacitance (EDLC). When the current density is 0.2 A/g, the discharge capacity and energy density are 502 F/g and 6.5 Wh/kg, respectively. Compared with the discharge capacity at 0.2 A/g, it still keeps 61.7% at 40 A/g. The superior electrochemical performance has a closely connection with the huge pore volume, surface area and the doping of N species, which afford rapid ions migration, abundant residence sites and outstanding pseudocapacitance properties. CO2 capture behavior on the N-doped carbons complie with Bangham mode. When the system temperature is 25 °C, the C(N)-700 material achieves an appreciable capture amount of 4.25 mmol/g in a stream of 40 mL/min. At room temperature, the adsorption capacity ratios of CO2/N2 and CO2/O2 are 2.6 and 3.7, respectively. The superior CO2 adsorption performance is also closely in connection with the unique pore structure and plentiful N affinity places.

Keywords: Carbon; Porous; N-doping; Rate capability; CO2 adsorption (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1016/j.apenergy.2024.123426

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