Facile Synthesis of Microsphere Copper Cobalt Carbonate Hydroxides Electrode for Asymmetric Supercapacitor

TY - JOUR

T1 - Facile Synthesis of Microsphere Copper Cobalt Carbonate Hydroxides Electrode for Asymmetric Supercapacitor

AU - Liu, Shude

AU - Hui, K. S.

AU - Hui, K. N.

AU - Jadhav, Vijaykumar V.

AU - Xia, Qi Xun

AU - Yun, Je Moon

AU - Cho, Y. R.

AU - Mane, Rajaram S.

AU - Kim, Kwang Ho

N1 - Publisher Copyright: © 2015 Elsevier Ltd. All rights reserved.

PY - 2016/1/10

Y1 - 2016/1/10

N2 - Porous microspheres copper cobalt carbonate hydroxides (CuxCo2-xCH) pseudocapacitive electrode material comprised of nanoplates via a facile hydrothermal method were presented. Significantly, the crystalline structure, morphology and electrochemical performance of the CuxCo2-xCH can be readily manipulated by varying the Cu/Co molar ratios. Among various stoichiometries of CuxCo2-xCH porous microspheres studied, Cu1.79Co0.21CH consisted of nanoplates with a mean thickness of ∼35 nm showed a high specific capacitance of 789 F g-1 at a current destiny of 1 A g-1 and good rate ability. Furthermore, the optimized Cu1.79Co0.21CH electrode also exhibited remarkable high cycling stability, ca 77.5% after 3000 charge/discharge cycles at current density of 5 A g-1. An asymmetric device was constructed from optimized Cu1.79Co0.21CH materials on nickel foam (NF) as cathode electrode and graphene on NF as anode electrode in a 6 M KOH electrolyte. The asymmetric Cu1.79Co0.21CH/NF//graphene/NF supercapacitor device delivered a specific capacitance of 60.5 F g-1 in a potential range of 0-1.6 V. A high energy density of 21.5 W h kg-1 was achieved at the power density of 200 W kg-1. More significantly, the designed device exhibited excellent cycling stability with 73.3% capacity retention after 5000 cycles.

AB - Porous microspheres copper cobalt carbonate hydroxides (CuxCo2-xCH) pseudocapacitive electrode material comprised of nanoplates via a facile hydrothermal method were presented. Significantly, the crystalline structure, morphology and electrochemical performance of the CuxCo2-xCH can be readily manipulated by varying the Cu/Co molar ratios. Among various stoichiometries of CuxCo2-xCH porous microspheres studied, Cu1.79Co0.21CH consisted of nanoplates with a mean thickness of ∼35 nm showed a high specific capacitance of 789 F g-1 at a current destiny of 1 A g-1 and good rate ability. Furthermore, the optimized Cu1.79Co0.21CH electrode also exhibited remarkable high cycling stability, ca 77.5% after 3000 charge/discharge cycles at current density of 5 A g-1. An asymmetric device was constructed from optimized Cu1.79Co0.21CH materials on nickel foam (NF) as cathode electrode and graphene on NF as anode electrode in a 6 M KOH electrolyte. The asymmetric Cu1.79Co0.21CH/NF//graphene/NF supercapacitor device delivered a specific capacitance of 60.5 F g-1 in a potential range of 0-1.6 V. A high energy density of 21.5 W h kg-1 was achieved at the power density of 200 W kg-1. More significantly, the designed device exhibited excellent cycling stability with 73.3% capacity retention after 5000 cycles.

KW - Asymmetric supercapacitor

KW - Copper cobalt carbonate hydroxide

KW - Hydrothermal method

KW - Microsphere

KW - Nanoplate

UR - http://www.scopus.com/inward/record.url?scp=84954270982&partnerID=8YFLogxK

U2 - 10.1016/j.electacta.2015.12.018

DO - 10.1016/j.electacta.2015.12.018

M3 - 文章

AN - SCOPUS:84954270982

SN - 0013-4686

VL - 188

SP - 898

EP - 908

JO - Electrochimica Acta

JF - Electrochimica Acta

ER -