Wee, Jae-Hyung Kim, Yoong Ahm Yang, Cheol-Min 2024-01-19T15:34:18Z 2024-01-19T15:34:18Z 2021-09-02 2021-01 1387-1811 https://pubs.kist.re.kr/handle/201004/117596 To store more energy in limited spaces, the volumetric performance of energy storage devices used in electric vehicles and portable electronics has attracted more research attention than their gravimetric performance. Herein, we describe the preparation of N/O co-doped single-walled carbon nanohorns (SWCNH) using chemical vapor deposition with pyridine followed by acid treatment to obtain a supercapacitor electrode material with high specific volumetric capacitance. The synthesized N/O co-doped SWCNH (N and O contents of 6.1 and 9.1 at %, respectively) electrode had a higher bulk density (1.05 g cm(3)) than that of the pristine SWCNH electrode (0.86 g cm(-3)). Moreover, the N/O co-doped SWCNH supercapacitor electrode exhibited drastically increased specific volumetric, gravimetric, and areal capacitances (123 F cm(-3), 117 F g(-1), and 91.4 mu F cm(-2), respectively) in 1 M H2SO4 electrolyte, compared with those of a pristine SWCNH electrode (36 F cm(-3), 42 F g(-1), and 11.4 mu F cm(-2), respectively). The superior electrochemical performances are associated with enhanced pseudocapacitive contribution and high bulk density of electrode upon N/O co-doping. The simple method described herein for producing SWCNH electrodes with high bulk density and high specific volumetric capacitance should contribute to the development of supercapacitors with high volumetric performance. English ELSEVIER CHEMICAL-VAPOR-DEPOSITION DOPED POROUS CARBON CAPACITANCE GRAPHENE SITES Sequential doping of nitrogen and oxygen in single-walled carbon nanohorns for use as supercapacitor electrodes Article 10.1016/j.micromeso.2020.110595 1 MICROPOROUS AND MESOPOROUS MATERIALS, v.310 MICROPOROUS AND MESOPOROUS MATERIALS 310 scie scopus 000585269400003 2-s2.0-85091253544 Chemistry, Applied Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article CHEMICAL-VAPOR-DEPOSITION DOPED POROUS CARBON CAPACITANCE GRAPHENE SITES Single-walled carbon nanohorn Nitrogen doping Oxygen doping Electrode bulk density Supercapacitor Specific volumetric capacitance