Vanadium pentoxide nanochains for high-performance electrochemical supercapacitors

• Published in: Journal of colloid and interface science Vol. 472; pp. 210 - 219
• Main Authors: Umeshbabu, Ediga, Ranga Rao, G.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 15.06.2016
• Subjects: Capacitance; cetyltrimethylammonium bromide; CTAB; Current density; dielectric spectroscopy; Electrochemical analysis; Electrochemical impedance spectroscopy; electrochemistry; electrodes; hot water treatment; Hydrothermal synthesis; Ion exchangers; ions; lithium; Nanochains morphology; Nanostructure; Pseudocapacitive behavior; Specific surface; surface area; vanadium; Vanadium oxide; Vanadium pentoxide; Vanadium oxide; Hydrothermal synthesis; Nanochains morphology; CTAB; Pseudocapacitive behavior
• ISSN: 0021-9797; 1095-7103; 1095-7103
• DOI: 10.1016/j.jcis.2016.03.050

[Display omitted] •Synthesis of V2O5 nanochains for charge storage applications.•Hydrothermal medium with CTAB surfactant is crucial to obtain V2O5 nanochains.•Capacitance of bulk V2O5<agglomerated V2O5 particles<V2O5 nanochains. We have synthesized unique hierarchical one dimensional (1D) nanochains of V2O5 by employing simple hydrothermal method using cetyltrimethylammonium bromide (CTAB) as a soft template. The electrochemical performance of resulting V2O5 electrode materials was evaluated by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy techniques. The V2O5 nanochains (V2O5-ctab) show maximum specific capacitance of 631Fg−1 at a current density of 0.5Ag−1 and retain 300Fg−1 even at high current density of 15Ag−1. In addition the V2O5 nanochains show good cyclic stability with 75% capacitance retention after 1200 charge-discharge cycles. The order of specific capacitance is commercial bulk-V2O5 (160Fg−1)<agglomerated V2O5 particles (395Fg−1)<V2O5 nanochains (631Fg−1). The interconnected nanochain-like morphology and high specific surface area are the main factors which contribute to higher electrochemical performance to V2O5 nanochains and promote facile exchange of Li+ ions during the charge-discharge processes.