A Three Dimensional Conductive Matrix of Activated Carbon Coated Copper-Cobalt Prussian Blue Material for Sodium Ion Supercapacitors

Abstract

In this work, a three dimensional (3D) conductive material of activated carbon coating Copper-Cobalt Prussian Blue (PB) is synthesized and applied on sodium ion supercapacitors. The activated carbon is proved able to enhance the conductivity, prevent structural collapse during sodium ion deintercalation, reduce interstitial water in PB crystals as well as special hindrance, and improve electrochemical performance of super capacitors dramatically. It is demonstrated that a specific capacity of 90.4 F g−1 and and power density of 4.3 kW kg−1 as well as energy density of 65.1 Wh kg−1 are achieved for CuCoHCF@ AC//AC device. In addition, 90% % starting value are retained for the specific capacity after 2000 cycles operation.

Toward the Design of High‐performance Supercapacitors by Prussian Blue, its Analogues and their Derivatives

“…Although pristine PB/PBAs show promising results, their capacitance is largely undermined by the poor conductivity of the pristine PB/PBAs frameworks. A number of studies have investigated the use of conductive carbon substrates (such as graphene, [ 69,70 ] carbon nanotubes, [ 81 ] and AC [ 82 ] ), redox metal oxides (such as MnO 2 [ 83,84 ] and iron oxide [ 85 ] ), and conducting polymers (such as PPy, [ 86 ] PANI, [ 87 ] and PEDOT: PSS [ 88 ] ) to impart higher conductivity and good cycling stability to PB/PBAs frameworks. Table 2 lists the electrochemical performance characteristics of the representative hybrid PB/PBAs materials for SCs.…”

“…NiCoHCF/rGO exhibited higher specific capacitance of 466 F g −1 at 0.2 A g −1 compared with NiHCF 2 /CTAB/rGO (415 F g −1 at 0.2 A g −1 ). [ 96 ] Additionally, PB‐doped super‐activated carbon (PB/SAC) nanocomposite [ 98 ] and AC‐coated CuCoHCF electrodes [ 82 ] have been designed to improve the specific capacitance and cycle life of the single component and their electrochemical performances are also listed in Table 2.…”