期刊
ENERGY & FUELS
卷 35, 期 20, 页码 16860-16869出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.1c01690
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资金
- Ministry of Science and Technology in Taiwan [MOST-108-2113-M-024-002]
- Zigong New Materials SME Technology Innovation Sharing Platform
The study developed a promising route to prepare honeycomb-like activated carbon with hierarchical porous features from spent lotus stems, exhibiting a ultrahigh specific surface area and excellent capacitance performance, especially under high-rate charge-discharge conditions.
Although highly porous carbon electrode materials from biomass wastes for high-performance electric double-layer capacitors (EDLCs) have attracted great attention recently, the fast charge-discharge performance under ultrahigh current density (100 A g(-1)) still remains a challenge. Herein, we develop a promising route to massively prepare honeycomb-like activated carbon (AC) with hierarchical porous features from spent lotus stems (SLSs) exhibiting an ultrahigh specific surface area of 4190 m(2) g(-1). The preparation process of the SLSAC samples includes carbonization at 400 degrees C in argon (denoted as c-SLS) and followed a KOH chemical activation using various KOH/c-SLS mass ratios at 800 degrees C for 1 h. The SLSAC-5-based electrode (KOH/c-SLS = 5/1) displays a good gravimetric capacitance of 330 F g(-1) at 0.5 A g(-1) with a superior high-rate capacitance of 243 F g(-1) at 100 A g(-1) and presents remarkable cycling stability with a capacitance retention near 100% over 10,000 cycles at 2 A g(-1) using 6 M KOH aqueous electrolyte. Additionally, the SLSAC-5-based sample delivers an energy density of 18.6 W h kg(-1) at 199.2 W kg(-1) with 1 M Na2SO4 electrolyte. Herein, we reveal a simple, promising route to massively generate SLSAC-based samples and investigate prominent electrochemical properties in ultra-fast charge-discharge EDLCs.
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