Ammonium nickel‐cobalt phosphate nanoflowers on highly conductive carbon fibers as an electrode material for enhanced electrochemical performance supercapacitors

Abstract

The nickel cobalt ammonium phosphate (NH 4 (Ni, Co)PO 4 )/carbon fibers (CFs) electrode materials were prepared by a hydrothermal method. The nanoflower-like active materials (NH 4 (Ni, Co)PO 4 ) have an average particle size of about 500 nm, which are uniformly and tightly dispersed on the surface of CFs. The specific capacitance of the composite electrode NCCF-3 with a molar ratio of Co and Ni of 1:1 is as high as 811.1 FÁg À1 at the current density of 1.25 AÁg À1 . Meanwhile, the electrochemical performance of NCCF-3 exhibits a good reversibility and batter stability of 89.1% capacitance retention after 2000 cycles. The maximum energy density of NCCF-3 is 20.28 WhÁkg À1 at the power density of 189.17 WÁkg À1 . The electric double-layer of the highconductivity CFs combined with the pseudocapacitance of NH 4 (Ni, Co)PO 4 will help to improve their electrochemical performances. The NCCF-3 electrode materials, which can effectively improve the capacitance and stability, are a potential composite electrode for the applications of a supercapacitor.

Development of amorphous Fe‐doped nickel‐cobalt phosphate (FexNiCo(PO4)2) nanostructure for enhanced performance of solid‐state asymmetric supercapacitors

“…Also, Li et al 65 investigated the electrochemical supercapacitor properties of NiCoP/NF‐2 nanosheets and obtained a maximum specific capacity of 883 C g −1 at 1 A g −1 current density. Ma et al 66 studied the electrochemical properties of nanoflowers‐like NH 4 (Ni,Co)PO 4 electrodes prepared via a hydrothermal method. The NH 4 (Ni,Co)PO 4 exhibited a maximum capacitance of 811.1 F g −1 at 1.25 A g −1 in 3 mol/L KOH.…”

Elucidating Electrochemical Energy Storage Performance of Unary, Binary, and Ternary Transition Metal Phosphates and their Composites with Carbonaceous Materials for Supercapacitor Applications

“…Dang et al [118] prepared P-CSs @ Ni1-Co2-P NSs through hydrothermal carbonization method. The specific capacitance of nanocomposites was 1040.3 F g -1 at 1 A g -1 [117] greater than pristine NCCF-3 (811.1 F•g −1 of 1.25 Ag −1 ) [156]. At high current density of 30 A g -1 , it retained to 505.5 F g -1 .…”

A Membrane‐Free Decoupled Water Electrolyzer Operating at Simulated Fluctuating Renewables with Tri‐Functional NiCo‐P Electrode

“…[25,26] Zhang et al synthesized nanoflowers-like NH 4 (Ni,Co)PO 4 on carbon fibers via a hydrothermal method. [27] The composite electrode with a molar ratio of Co and Ni of 1 : 1 exhibited a maximum capacitance of 811.1 F g À 1 at a current density of 1.25 A g À 1 in 3 M KOH. Chen et al presented a facile electrodeposition strategy to fabricate an ultrathin transitionmetal phosphate nanosheet for SCs.…”

“…Zhang et al. synthesized nanoflowers‐like NH 4 (Ni,Co)PO 4 on carbon fibers via a hydrothermal method [27] . The composite electrode with a molar ratio of Co and Ni of 1 : 1 exhibited a maximum capacitance of 811.1 F g −1 at a current density of 1.25 A g −1 in 3 M KOH.…”