Choi, Yong-Mun Singh, Kiran Pal Park, Jong Deok You, Nam-Ho Yang, Cheol-Min Goh, Munju Yu, Jong-Sung 2024-01-20T05:02:15Z 2024-01-20T05:02:15Z 2021-09-05 2016-02 2194-4288 https://pubs.kist.re.kr/handle/201004/124442 The obtainment of a high specific surface area (SSA) without disrupting the conductivity of carbon is very challenging. Herein, an as-synthesized polyamic acid (PAA) derivative dissolved in 1,4-dioxane solvent was freeze dried to prepare a PAA cryogel, which allowed homogenous shrinkage of the texture and a high carbon yield upon carbonization. This work presents the successful template-free preparation of a high-surface area microporous carbon with a unique microcellular structure by simple carbonization treatment of a PAA cryogel. Upon increasing the carbonization temperature, the N content decreased, which was unfavorable for capacitance, but simultaneously, both the surface area and the crystallinity increased, which was beneficial in increasing the capacitance; these results are indicative of an interesting trade-off relationship between surface area, conductivity, and the N content of the carbon. In particular, C-PAA(1000) prepared by carbonization at 1000 degrees C from the PAA cryogel showed a high porosity of approximately 90.8% and a remarkably high SSA of 2038 m(2)g(-1) along with high crystallinity and effective N doping favorable for good conductivity; this material thus illustrates a high specific capacitance of 248 Fg(-1) at 0.5 Ag-1 and excellent stability in inorganic electrolyte. English WILEY-V C H VERLAG GMBH PERFORMANCE ELECTRODE MATERIAL MULTIMODAL POROUS CARBON DOUBLE-LAYER CAPACITOR ACTIVATED CARBON SUPERCAPACITOR ELECTRODES DOPED GRAPHENE NITROGEN FILMS GRAPHITE CONDUCTIVITY Hierarchical Microcellular Microporous Carbon from Polyamic Acid Cryogel and its Electrochemical Capacitance Article 10.1002/ente.201500225 1 ENERGY TECHNOLOGY, v.4, no.2, pp.278 - 287 ENERGY TECHNOLOGY 4 2 278 287 scie scopus 000371149900006 2-s2.0-85015417871 Energy & Fuels Energy & Fuels Article PERFORMANCE ELECTRODE MATERIAL MULTIMODAL POROUS CARBON DOUBLE-LAYER CAPACITOR ACTIVATED CARBON SUPERCAPACITOR ELECTRODES DOPED GRAPHENE NITROGEN FILMS GRAPHITE CONDUCTIVITY carbon cryogels hierarchical structures microporous materials supercapacitance