3 years ago

Hierarchically Porous Carbons Derived from Cotton Stalks for High-Performance Supercapacitors

Hierarchically Porous Carbons Derived from Cotton Stalks for High-Performance Supercapacitors
Jiao Yin, Chuanyi Wang, Xiaonan Kang
In this work, cotton stalks (CSs), as an earth-abundant biomass, were originally proposed as a new carbonaceous precursor to prepare hierarchically porous carbons (HPCs) with the activation of various concentrations of H3PO4 at high temperatures. A variety of measurements including SEM, TEM, N2 adsorption/desorption analysis, XPS and FTIR have been adopted to systemically investigate the micromorphology, pore structure, and surface chemistry of the HPCs. The CS-derived HPCs (CSHPCs) have large specific surface areas up to 1403.123 m2 g−1 and a broad pore-size distribution indicates their hierarchically porous structures. Furthermore, electrochemical measurements including electrochemical impedance spectroscopy, galvanostatic charge/discharge and cyclic voltammetry were used to evaluate the capacitance and rate performance of the HPCs. The investigations illustrated that CSHPCs possess a high specific capacitance up to 175 F g−1 at a scan rate of 5 mV s−1 in 2 M KOH. In addition, CSHPCs have good long-term cycling stability and more than 90 % of the initial capacity is retained after 10000 cycles at a large current density of 1 A g−1. A new thread: A simple and cost-effective method for the synthesis of hierarchically porous carbons from cotton stalks (CSs) with H3PO4 activation is reported. Benefiting from the unique hierarchical structure, the resulting material presents a higher surface area utilization rate than other CS-derived porous carbons, a high specific capacitance (175 F g−1) in alkaline solution, an excellent rate capability and long-term stability.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/celc.201700501

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