In Situ Growth of NiCo Layered Double Hydroxide on Biomass Waste‐Based Substrate: A Novel Material with 3D Interconnected Structure as Electrodes for Supercapacitors. Issue 12 (4th November 2022) - Qu, Keqi
Abstract : Next‐generation energy storage systems require green and renewable electrodes with a high specific capacity, which combine biomass waste and bimetallic hydroxide synergically to satisfy environmental enhancements and economic benefits. Herein, a novel approach to improving the electrical conductivity of bimetallic materials by in situ growing NiCo layered double hydroxides (LDHs) with pseudocapacitance capability on KMnO4 ‐activated fungus bran‐derived carbons (FBCs) is reported, achieving improved electrochemical performance in supercapacitors (SCs). The hierarchical porous FBC substrate contributes to the homogeneous growth of the LDHs and high electronic and ionic conductivity. The optimal composite (FBC/NCL‐3) with a 3D interconnected structure provides a specific capacitance of 1938 F g −1 at a current density of 1 A g −1 . Correspondingly, the hybrid battery‐SC device composed of FBC/NCL‐3 and FBC provides favorable stability (76% specific capacity retention at 5 A g −1 for 3000 cycles) with an operating voltage of 1.4 V and a high energy density of 37.3 Wh kg −1 at a power density of 695.6 W kg −1 . This work demonstrates a promising strategy using FBC as a substrate for growing LDH materials aiming to achieve high‐performance SCs. Abstract : KMnO4 ‐activated fungus bran‐derived carbon (FBC) is used as a carbon‐based substrate, which is compounded with NiCo layered double hydroxide to form a structurally stable carbon–metal composite (FBC/NCL) electrode material. The asymmetric supercapacitor assembled by FBC/NCL and FBC shows excellent electrochemical performance in the aqueous electrolyte.