Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 310, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2020.110595
Keywords
Single-walled carbon nanohorn; Nitrogen doping; Oxygen doping; Electrode bulk density; Supercapacitor; Specific volumetric capacitance
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Funding
- Korea Institute of Science and Technology (KIST) Institutional Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2016M3A7B4027695]
- Nano.Material Technology Development Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2016M3A7B4027695]
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This study focuses on the preparation of N/O co-doped single-walled carbon nanohorns (SWCNH) for high specific volumetric capacitance in supercapacitor electrode materials. The synthesized N/O co-doped SWCNH electrode exhibited superior electrochemical performances with increased specific volumetric, gravimetric, and areal capacitances, attributed to enhanced pseudocapacitive contribution and high bulk density upon N/O co-doping. This simple method for producing SWCNH electrodes with high bulk density and high specific volumetric capacitance could contribute to the development of supercapacitors with high volumetric performance.
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.
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