Electrochemical Performance of Flexible Electrospun Carbon-MnOx Hybrid Nanofibrous Membranes for Supercapacitors†

doi:10.7503/cjcu20160857

Abstract

Abstract:

Super-hydrophilic flexible MnO_x/carbon nanofibers(MnO_x/CNFs) composites were fabricated by electrospinning technique. The nanostructures of MnO_x/CNFs were proved by XRD, SEM and TEM measurements. The results confirmed that the composites possessed higher electrochemical capacitance than each individual component as supercapacitor electrode materials. The hybrid nanofibrous electrodes with 40%(mass fraction) manganese acetate(MC-4) exhibits extremely high specific capacitance of 1112.5 F/g at a current density of 1 A/g and superior cycling stability such as high capacitance retention of 93.4% at a current density of 10 A/g over 3000 charge-discharge cycles in a 2 mol/L KOH electrolyte. The enhanced electrochemical performance of the composite electrode originates from the combined effects of the two components as follows: (1) 3D superhydrophilic MnO_x/CNFs network over a relatively larger surface area reduces the difusion resistance of the electrolyte into the electrode matrix; (2) the synergistic effect between carbon and MnO_x. Carbon layer wrapped around MnO_x particles can prevent structural damage to the MnO_x during charge/discharge processes and contribute to an increased capacitance of the composite.

Key words: Electrospun, MnOx, Carbon nanofiber, Electrochemical performance, Supercapacitor

CLC Number:

O646
O613

TrendMD:

PAN Chao, GU Haiteng, ZONG Feixu, GAO Jingyi. Electrochemical Performance of Flexible Electrospun Carbon-MnO_x Hybrid Nanofibrous Membranes for Supercapacitors^†[J]. Chem. J. Chinese Universities, 2017, 38(6): 953.

Figures/Tables 7

Fig.1 XRD patterns of MnOx/CNFs a. CNFs; b. MC-2; c. MC-4; d. MC-6.

Fig.2 Raman spectra of MnOx/CNFs a. MC-2; b. MC-4; c. MC-6.

Fig.3 SEM images of MnOx/CNFs with different manganese contents (A) CNFs; (B) MC-2; (C) MC-4; (D) MC-6.

Fig.4 TEM images of MnOx/CNFs with different manganese contents (A) MC-2; (B) MC-4; (C) MC-6.

Fig.5 Photographs of water droplet profile on MnOx/CNFs films (A1, A2) MC-2; (B1, B2) MC-4; (C1, C2) MC-6.

Fig.6 Cyclic voltammetry curves of MnO2, MC-2, MC-4 and MC-6 at scan rate of 30 mV/s(A) and MC-4 at different scan rates(B)

Fig.7 Galvanostatic charge/discharge curves of MnO2, MC-2, MC-4 and MC-6 at 1 A/g current density(A), MC-4 at different current densities(B), specific capacitance curves of MnO2, MC-2, MC-4 and MC-6 at different current densities(C) and specific capacitance as a function of cycle number at 10 A/g of MC-4(D)

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