Novel zinc–iodine hybrid supercapacitors with a redox iodide ion electrolyte and B, N dual-doped carbon electrode exhibit boosted energy density

Abstract

A novel high-energy-density zinc–iodine hybrid supercapacitor was designed via the introduction of a redox iodide ion electrolyte and B, N dual-doped carbon electrode.

Cu-MOF derived Cu–C nanocomposites towards high performance electrochemical supercapacitors

“…However, there are fewer types of anodes, and the usual reports are porous carbons and ferric oxide. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Ferric oxide usually has poor electrical conductivity and needs to be combined with carbon materials, leading to reduction of its capacitance. Therefore, it is challenging to develop new anode materials with good conductivity and high capacitance.…”

S‐doped 3D porous carbons derived from potassium thioacetate activation strategy for zinc‐ion hybrid supercapacitor applications

“…The S‐3DPC‐800 based device could deliver a maximum energy density of 162.6 Wh kg −1 (99.0 Wh L −1 ) at the power density of 160 W kg −1 (97.4 W L −1 ), and still maintains an impressive energy density of 64.8 Wh kg −1 (39.5 Wh L −1 ) as the power density increased to 16 kW kg −1 (9.74 kW L −1 ). Notably, the S‐3DPC‐800 exhibits higher energy density than S‐3DPC‐700 and S‐3DPC‐900 devices as well as the other porous carbons with similar or much lower active mass loading reported previously 19,21,23,26,46‐49 . To verify its practical application, two S‐3DPC‐800 devices connected in series can afford an outstanding performance to serve as the energy source for 15 red LED lights (Figure 8B, Video S1).…”

“…Notably, the S-3DPC-800 exhibits higher energy density than S-3DPC-700 and S-3DPC-900 devices as well as the other porous carbons with similar or much lower active mass loading reported previously. 19,21,23,26,[46][47][48][49] To verify its practical application, two S-3DPC-800 devices connected in series can afford an outstanding performance to serve as the energy source for 15 red LED lights ( Figure 8B, Video S1). The LED lights continuous work for more than 3 minute after being charging at 5 A/g for 82 seconds.…”

Small‐Molecular Crowding Electrolyte Enables High‐Voltage and High‐Rate Supercapacitors

“…[ 7–12 ] Introduction of redox‐active additives with fast kinetics to suppress the HER and OER is a facile way to enhance the operation voltage. [ 13–16 ] By reducing the free water molecules to intrinsically suppress the water activity and forming a solid electrolyte interphase, the “water in salt” (WIS) electrolytes significantly expand the ESW of aqueous electrolytes to 3 V, [ 17 ] opening a new avenues for the high‐voltage aqueous energy devices. [ 18–21 ] However, the highly concentrated salts inevitably raise the cost and hamper its widespread applications.…”