title: Vanadium pentoxide nanochains for high-performance electrochemical supercapacitors.
abstract: 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 631 F g(-1) at a current density of 0.5 A g(-1) and retain 300 F g(-1) even at high current density of 15 A g(-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 (160 F g(-1))<agglomerated V2O5 particles (395 F g(-1))<V2O5 nanochains (631 F g(-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.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
authors.forename: Ediga
authors.initials: E
authors.lastname: Umeshbabu
authors.affiliation: Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India. Electronic address: grrao@iitm.ac.in.
authors.forename: G
authors.initials: G
authors.lastname: Ranga Rao
keywords: CTAB; Hydrothermal synthesis; Nanochains morphology; Pseudocapacitive behavior; Vanadium oxide