Temperature-controlled in situ synthesized carbon nanotube-protected vanadium phosphate particle-anchored electrospun carbon nanofibers for high energy density symmetric supercapacitors

Hyoju Kim; Arjun Prasad Tiwari; Tanka Mukhiya; Hak Yong Kim

doi:10.1016/j.jcis.2021.05.090

Temperature-controlled in situ synthesized carbon nanotube-protected vanadium phosphate particle-anchored electrospun carbon nanofibers for high energy density symmetric supercapacitors

J Colloid Interface Sci. 2021 Oct 15:600:740-751. doi: 10.1016/j.jcis.2021.05.090. Epub 2021 May 18.

Authors

Hyoju Kim¹, Arjun Prasad Tiwari², Tanka Mukhiya³, Hak Yong Kim⁴

Affiliations

¹ Department of Carbon Materials and Fiber Engineering, Jeonbuk National University, Jeonju 561-756, Republic of Korea.
² Carbon Nano Convergence Technology Center for Next Generation Engineers (CNN), Jeonbuk National University, Jeonju-si, Jeollabuk-do 54896, Republic of Korea; Department of Nano Convergence Engineering, Jeonbuk National University, Jeonju 561-756, Republic of Korea. Electronic address: tiwariarjuna@gmail.com.
³ Department of Nano Convergence Engineering, Jeonbuk National University, Jeonju 561-756, Republic of Korea.
⁴ Department of Carbon Materials and Fiber Engineering, Jeonbuk National University, Jeonju 561-756, Republic of Korea; Department of Nano Convergence Engineering, Jeonbuk National University, Jeonju 561-756, Republic of Korea. Electronic address: dragon4875@gmail.com.

PMID: 34052529
DOI: 10.1016/j.jcis.2021.05.090

Abstract

Designing a novel composite material with hierarchical nanostructures as a negative electrode material with high capacitance and outstanding stability is challenging. To this end, we synthesized carbon nanotubes (CNTs)-protected vanadium phosphate (VPO) nanoparticles trapped within an electrospun carbon matrix (CNTs@VPO@CNFs) for potential use in energy storage applications. Temperature was found to be the major controlling factor for the fabrication of composites with CNT decoration. CNTs@VPO@CNFs exhibited the highest capacitance of 576.1F g^-1 at a current density of 0.66 A g^-1 among other corresponding electrode materials. Furthermore, this electrode exhibited outstanding stability of up to 99% after 5000 cycles, which was attributed to the coating of core-forming VPO@CNFs by the CNTs as the sheath material. Interestingly, the as-fabricated material worked in a wide potential range from -1.2 to 0.6, thereby providing the opportunity to assemble a symmetric supercapacitor device (SSCD). The SSCD showed an exceptionally high energy density of 69.1 W h kg^-1 at a power density of 3.2 kW h and ~ 90% stability after 5000 cycles. Thus, this work presents a strategy for fabricating a new composite as a negative electrode material that can be used in a symmetrical supercapacitor device with an ultrahigh energy density.

Keywords: Carbon nanotubes; Electrospun carbon nanofiber matrix; Negative electrode materials; Symmetric supercapacitor device; Vanadium phosphate.