Freeze gelation 3D printing of rGO-CuCo2S4 nanocomposite for high-performance supercapacitor electrodes

•A homogeneous hybrid nano ink based on rGO-CuCo2S4 nanocomposites.•A judicious combination of the freeze gelation method and 3D printing technique for the fabrication of high porosity material.•The supercapacitor electrodes with high specific capacitance and excellent capacitance retention. Reduced...

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Bibliographic Details
Published in:Electrochimica acta 2021-10, Vol.392, p.138992, Article 138992
Main Authors: Tung, Doan Thanh, Tam, Le Thi Thanh, Dung, Hoang Tran, Dung, Ngo Thanh, Hong, Phan Ngoc, Nguyet, Ha Minh, Van-Quynh, Nguyen, Van Chuc, Nguyen, Trung, Vu Quoc, Lu, Le Trong, Minh, Phan Ngoc
Format: Article
Language:English
Subjects:
3D printing
Metal sulfide
Nanocomposite
Reduced graphene oxide
Supercapacitor
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Summary:•A homogeneous hybrid nano ink based on rGO-CuCo2S4 nanocomposites.•A judicious combination of the freeze gelation method and 3D printing technique for the fabrication of high porosity material.•The supercapacitor electrodes with high specific capacitance and excellent capacitance retention. Reduced graphene oxide (rGO)-CuCo2S4 nanocomposites are synthesized by a facile hydrothermal method. Thiourea has been used as a sulfur source for synthesizing CuCo2S4 nanoparticles. The synthesized materials are then dispersed in phenol with the addition of Polyvinylpyrrolidone (PVP), which acts as a binder to form the homogeneous rGO-CuCo2S4 slurry. This as-prepared slurry is then deposited on the graphite paper using 3D printing technique combined with the freeze gelation method to form a rGO - CuCo2S4 electrode. X-ray diffractometry (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and electrochemical techniques have been used to characterize rGO-CuCo2S4 nanocomposite. The nanocomposite has a microporous structure with CuCo2S4 nanoparticles decorated on the rGO sheet surface. Electrochemical studies revealed that the rGO-CuCo2S4 nanocomposite electrode has a high specific capacitance of ca. 1123 F/g at 5 mV/s and excellent capacitance retention. A 91% capacitance remained approximately after 20000 successive cycles at a high current density of 125 A/g are remarkable and it has not been widely reported for a supercapacitor electrode. [Display omitted]
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2021.138992