Nazarian-Samani, Masoud Haghighat-Shishavan, Safa Nazarian-Samani, Mahboobeh Kim, Myeong-Seong Cho, Byung-Won Oh, Si-Hyoung Kashani-Bozorg, Seyed Farshid Kim, Kwang-Bum 2024-01-20T00:00:15Z 2024-01-20T00:00:15Z 2021-09-03 2017-12-31 0378-7753 https://pubs.kist.re.kr/handle/201004/121899 A P, N dual-doped holey graphene (PNHG) material is prepared by a scalable, facile synthetic approach, using a mixture of glucose, dicyandiamide (DCDA), and phosphoric acid (H3PO4). H3PO4 successfully functions as an "acid catalyst" to encourage the uniform breakage of C = C bonds to create large, localized perforations over the graphene monolith. Further acid treatment and annealing introduce in-plane holes. The correlation between the capacitance of the PNHG and its structural parameters during the fabrication process is comprehensively evaluated. A thermally induced sp(2)-> sp(3) transformation occurs at high temperatures because of the substantialloss of graphitic sp(2)-type carbons, together with a dramatic reduction in capacitance. The target PNHG-400 electrode material delivers exceptionally high gravimetric capacitance (235.5 F g(-1) at 0.5 A g(-1)), remarkable rate capability (84.8% at 70 A g(-1)), superior capacitance retention (93.2 and 92.7% at 10 and 50 A g(-1) over 25000 cycles, respectively), and acceptable volumetric capacitance due to moderate density, when it is used with organic electrolytes in the voltage range between 0 and 3 V. These results suggest a pioneering defect-engineered strategy to fabricate dual-doped holey graphene with valuable structural properties for high-performance electric double layer supercapacitors, which could be used in next-generation energy storage applications. English ELSEVIER SCIENCE BV RAPID PREPARATION POROUS CARBON NITROGEN ACTIVATION ELECTRODES NANOSHEETS FABRICATION CAPACITANCE REDUCTION Rational hybrid modulation of P, N dual-doped holey graphene for high-performance supercapacitors Article 10.1016/j.jpowsour.2017.10.087 1 JOURNAL OF POWER SOURCES, v.372, pp.286 - 296 JOURNAL OF POWER SOURCES 372 286 296 scie scopus 000418392100034 2-s2.0-85032917280 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article RAPID PREPARATION POROUS CARBON NITROGEN ACTIVATION ELECTRODES NANOSHEETS FABRICATION CAPACITANCE REDUCTION Holey graphene Supercapacitor Acid catalyst Doping sp(2)-> sp(3) transition