Nitrogen-sulfur co-doped ZIF-8-derived carbon materials for supercapacitors with low self-discharge
JOURNAL OF ENERGY STORAGE(2024)
摘要
Supercapacitors (SCs) have attracted extensive attention due to the properties of high power density, long cycle life, and high rate performance. However, the high self-discharge is one giant challenge for long-term energy storage applications of SC. Herein, we prepared a high-performance SC with low self-discharge based on nitrogen-sulfur co-doped ZIF-8-derived (NS-PC) materials. The synergistic effects of high-temperature carbonization and nitrogen-sulfur (N-S) doping are systematically investigated. With a carbonization temperature of 900 degrees C, assisted with N-S doping, the maximum specific capacitance of the NS-PC-900//NS-PC-900 symmetrical SC is 42.7 F g- 1, while the power densities range from 650 to 13,000 W kg-1 at the energy densities of 10.04-7.5 Wh kg- 1. The specific capacitance remains 95.7 % even after 20,000 charge-discharge cycles. More importantly, the as-prepared NS-PC-900//NS-PC-900 SC exhibits an ultra-low self-discharge rate of solely 0.025 V h-1 within 24 h. This work provides a universal strategy to fabricate high-performance SCs with low self-discharge.
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关键词
Supercapacitor,Low self-discharge,ZIF-8,Carbonization,Nitrogen-sulfur co-doped,Long cyclic stability
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