Cobalt–iron decorated tellurium nanotubes for high energy density supercapacitor. (June 2022)

• Record Type: Journal Article
• Authors: Bhol, P.; Swain, S.; Altaee, A.; Saxena, M.; Samal, A.K.
• Is Part Of: Materials today chemistry. Volume 24(2022)
• Publication Date: 2022-06
• Subjects: Template -- Surfactant -- Conductivity -- Anisotropic -- Battery; Chemistry -- Periodicals; Materials -- Research -- Periodicals; Materials science -- Periodicals; Chemistry; Materials -- Research; Electronic journals; Periodicals; 660.282
• DOI: 10.1016/j.mtchem.2022.100871
• Languages: English
• ISSNs: 2468-5194

Abstract

Abstract: We report the synthesis of cobalt-iron (Co–Fe) decorated tellurium nanotubes (Te NTs) using semiconductive Te NTs as a sacrificial template, following a wet chemical method. The interplay of Co and Fe precursor concentrations incorporated with Te NT, residual hydrazine hydrate, and the negative surface charge of Te NT plays a significant role in obtaining various bimetallic telluride structures. The one-dimensional (1-D) structure of Co–Fe decorated Te NTs with Te NTs in the backbone provides superior conductivity and exhibits high electrochemical performance with battery type electrode behavior. A negative surface charge value of −18.9 mV for Te NTs is obtained due to the presence of an anionic surfactant as sodium dodecyl sulfate (SDS) forms a bilayer on Te NTs. To tune the energy density performance, the Co–Fe decorated Te NTs electrode is combined with the electric double-layer capacitors (EDLC) type electrode activated carbon (AC). The asymmetric assembly shows an excellent specific capacitance of 179.2 F/g (48.7 mAh/g) at a current density of 0.9 A/g in 4 M KOH electrolyte. More importantly, it exhibits a maximum energy density of 62.1 Wh/kg at a power density of 1, 138.2 W/kg under a potential window of 1.58 V. This potential finding shows the significant applicability of Te NTs as a template for the synthesis of bimetallic tellurides with unique morphologies. The synergistic effect from multiple metals and anisotropic morphology is beneficial for energy storage applications. Graphical abstract: Image 1 Highlights: Anisotropic nanotube structures of Te based material used for supercapacitor application. Template method synthesis followed to decorate bimetal Co–Fe on Te nanotubes. Based on surface charge study of synthesized material revealing the growth process and mechanism. Applicability as an electrode material in two electrode system with activated carbon as negative electrode. Excellent specific capacitance of 179.2 F/g at 0.9 A/g in 4 M KOH electrolyte with an energy density of 62.1 Wh/kg.