Journal
DIAMOND AND RELATED MATERIALS
Volume 116, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2021.108450
Keywords
Biomass-derived carbon; Activation method; Heteroatom self-doping; Asymmetric supercapacitor
Categories
Funding
- National Key Research and Development Program of China [2018YFB0604900]
- National Natural Science Foundation of China [21978198, 22002052]
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This study utilized Typha orientalis leaves to prepare P-doped hierarchical porous carbon material, which was used as the negative electrode for a supercapacitor and also as a support for growing MnO2 as the positive electrode. The assembled asymmetric supercapacitor device exhibited high specific capacitance and energy density.
Sustainable biomass-derived carbon used as electrode features the concept of green chemistry. Herein, Typha orientalis leaves, which show tunable porous structure with high phosphorus content, were used as precursor to prepare P-doped hierarchical porous carbon material and then acted as negative electrode for supercapacitor. Different with the traditional activation methods, the biomass was pretreated by ZnCl2 then activated with KOH (Zn-K-ATC). Owing to the hierarchical porous structure, large specific surface area (1975 m2 g-1) and pseudocapacitance provided by P self-doping, Zn-K-ATC had a high specific capacitance of 324 F g- 1 at 1 A g- 1 in 1 M KOH. Zn-K-ATC was further used as support to grow MnO2 (Zn-K-ATC/MnO2) as the positive electrode material with a specific capacitance of 384 F g- 1 at 1 A g-1 in 1 M Na2SO4. The assembled Zn-K-ATC/MnO2//Zn-K-ATC asymmetric supercapacitor device had a voltage window of 2 V with a high energy density of 46 Wh kg- 1 at 1000 W kg-1. This work gives a systematic research and complete inspection on the preparation of supercapacitor from biomass-derived materials, which expects to provide a valuable method for the preparation of green, low-cost, high-performance supercapacitor materials.
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