Homogeneous intercalated graphene/manganic oxide hybrid fiber electrode assembly by non-liquid-crystal spinning for wearable energy storage

doi:10.1016/j.jmst.2021.04.041

Abstract

Abstract:

Reduced graphene oxide (rGO)-based fibers with high electrochemical performance have recently showed great potential in the field of flexible energy storage devices. However, they still suffer from low capacitance due to the severe stacking of graphene sheets. Hybrids with nanofillers are an efficient way to improve the electrochemical performance of rGO fibers. Nevertheless, controlling the distribution of nanoparticles in the matrix is still an enormous challenge due to the strong attraction among these nanoparticles which results into agglomeration. Here, we continually prepared rGO hybrid fibers via non-liquid-crystal spinning, accompanied by chemical reduction. Manganic oxide (MnO_X) nanoparticles remained well-dispersed in GO dispersion during the continuous spinning of rGO/MnO_X hybrid fibers. Results showed that rGO/MnO_X-20 hybrid fibers possessed the best capacitance of 123.3 F g^-1 (87.6 F cm^-3) and 97.1 F g^-1 (68.9 F cm^-3) at the current density of 0.2 A g^-1, and 0.5 A g^-1 respectively. Furthermore, a fiber-shaped all-solid-state supercapacitor assembly from the optimized hybrid fibers demonstrated an energy density of 2.67 mWh cm^-3 (3.76 mWh g^-1) at the power density of 24.76 mWh cm^-3 (34.89 mWh g^-1). These fiber-based devices show great potential for application in the fields of wearable electronics and energy storage devices.

Key words: rGO/MnOx, Well-dispersion, Hybrid fiber, High performance

Guoyin Chen, Weiming Wang, Xin Lu, Innocent Tendo Mugaanire, Yang Zhang, Yulu Ai, Kai Hou, Benjamin S. Hsiao, Meifang Zhu. Homogeneous intercalated graphene/manganic oxide hybrid fiber electrode assembly by non-liquid-crystal spinning for wearable energy storage[J]. J. Mater. Sci. Technol., 2022, 97: 1-9.

Figures/Tables 7

Fig. 1. (a) Normal optical microscope images and (b) corresponding POM images of GO/MnOX-30 dispersion; (c) Normal optical microscope images and (d) corresponding POM images of basified GO/MnOX-30 dispersion; (e) Dependence of the viscosity of the pristine and basified GO/MnOX-30 dispersion on the shear rate, inset is a photograph of pristine and basified GO/MnOX-30 dispersion.

Fig. 2. (a) Schematic illustration of fabricating GO and GO/MnOX hybrid fiber; (b) Surface morphology, (c) sectional morphology, and (d) TEM image of the GO/MnOX-30 fiber; (e) A bobbin of fabricated GO/MnOX-30 fiber.

Fig. 3. (a-e) Surface morphology, and (f-j) cross-sectional morphology of rGO, rGO/MnOX-10, rGO/MnOX-20, rGO/MnOX-30, and rGO/MnOX-10, respectively.

Fig. 4. Structural analysis of rGO/MnOX hybrid fibers. (a) EDS mapping of rGO/MnOX-30 fiber, (b) Mn 2p, and (c) C 1 s XPS core level spectra of GO, rGO, GO/MnOX-20, and rGO/MnOX-20, respectively.

Fig. 5. (a) Typical tensile stress-strain curves of the rGO and rGO/MnOX hybrid fibers, (b) tensile strength, and tensile strain of the neat rGO and rGO/MnOX hybrid fibers obtained from mechanical tests; (c) Conductivity of neat rGO and rGO/MnOX hybrid fibers.

Fig. 6. Electrochemical properties of the fabricated rGO and rGO/MnOX hybrid fibers: (a) CV curves of LC rGO/MnOX-20 and NLC rGO/MnOX-20 at 10 mV s-1; (b) Schematic illustrating of nanoparticle dispersion within rGO matrix; (c) CV curves of rGO and rGO/MnOX hybrid fibers at 10 mV s-1; (d) CV curves of rGO/MnOX-20 fibers at different scan rate; (e) Mass-based capacitance calculated from related CV curves in d; (f) GCD curves and (g) related specific capacitance of rGO/MnOX-20 fibers; (h) EIS of all the fibers.

Fig. 7. (a) Photos and (b) components of the fabricated fiber-shaped all-solid-state supercapacitor; (c) fiber-shaped all-solid-state supercapacitor woven into a fabric; (d) CV curves of the device at different scan rate; (e) GCD curves and (f) mass- or volume-based capacitance of the device at different current density; (g) Bending stability of the device; (h) Cycle behavior of capacitance and coulombic efficiency change during the GCD cycling at 1.0 A g-1; (i) Comparison of the power density and energy density with other work, such like Li thin film battery, 2.75 V/44 mF commercial AC supercapacitor, MnO2 carbon fiber supercapacitor, 5.5 V/100 mF commercial supercapacitor.

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