화학공학소재연구정보센터
Electrochimica Acta, Vol.286, 55-64, 2018
Sodium-ion diffusion and charge transfer kinetics of sodium-ion hybrid capacitors using bio-derived hierarchical porous carbon
Even though Li-ion based energy storages can provide high specific energy and good cycling stability, the scarcity and high price of Li-based materials may limit their applications in the future. In this work, we have investigated Na-ion hybrid capacitors (NICs) with both high specific energy and power. Bio-derived or Jasmine rice-derived hierarchical porous carbon (j-HPC) with a specific BET surface area of 2377 m(2) g(-1) and a mean pore diameter of 2.53 nm containing 73.17 at.% C, 2.24 at.% N, and 24.59 at.%O is used as a new electrode of NICs. We have found that a fast Na ion diffusion of 10(-)(8)-10(-11) cm(2) s(-1) and a fast-standard heterogeneous rate constant of electron transfer of ca. 10(-8) cm s(-1) are two reasons leading to high-performance NIC. The NIC exhibits a maximum operating cell voltage of 3.8 V, a maximum specific energy of 116 Wh kg(-1) (142 mu Wh cm(-2)) and a maximum specific power of 11,121 W kg(-1) (13,618 mu W cm(-2)) with 90% capacity retention after 5000 cycles. Our NIC using j-HPC may be an ideal device for high power and energy storage technology. (C) 2018 Elsevier Ltd. All rights reserved.