title: Three-Dimensional Fibrous Network of Na0.21MnO2for Aqueous Sodium-Ion Hybrid Supercapacitors.
abstract: Sodium-ion hybrid supercapacitors are potential energy-storage devices and have recently received enormous interest. However, the development of cathode materials and the use of nonaqueous electrolyte remain a great challenge. Hence, aqueous Na-ion hybrid supercapacitors based on a three-dimensional network of NaMnO2were developed. The cathode material was synthesized by the electro-oxidation of potassium manganese hexacyanoferrate nanocubes. The oxidized compound was confirmed to be Na0.21MnO2by various physical characterization methods. Manganese dioxide is a well-characterized material for aqueous asymmetric pseudocapacitors, but its usage at high operating voltages is limited due to the electrochemical stability of water. Nevertheless, high-potential and high-performance aqueous supercapacitors exhibiting a cell potential of 2.7 V were developed. Further, the practical applicability of an asymmetric supercapacitor based on NaMnO2(cathode) and reduced graphene oxide (anode) was demonstrated by powering a 2.1 V red LED.
authors.affiliation: Electroanalysis and Bioelectrochemistry Laboratory, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No.1, Section 3, Chung-Hsiao East Road, Taipei, 106, Taiwan.
authors.forename: Natarajan
authors.initials: N
authors.lastname: Karikalan
authors.affiliation: Electroanalysis and Bioelectrochemistry Laboratory, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No.1, Section 3, Chung-Hsiao East Road, Taipei, 106, Taiwan.|Department of Chemistry, National (Taiwan) University, No. 1, Section 4, Roosevelt Road, Taipei, 106, Taiwan.
authors.forename: Chelladurai
authors.initials: C
authors.lastname: Karuppiah
authors.affiliation: Electroanalysis and Bioelectrochemistry Laboratory, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No.1, Section 3, Chung-Hsiao East Road, Taipei, 106, Taiwan.
authors.forename: Shen-Ming
authors.initials: SM
authors.lastname: Chen
authors.affiliation: Electroanalysis and Bioelectrochemistry Laboratory, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No.1, Section 3, Chung-Hsiao East Road, Taipei, 106, Taiwan.
authors.forename: Murugan
authors.initials: M
authors.lastname: Velmurugan
authors.affiliation: Department of Chemistry, Karunya University, Coimbatore, Tamil Nadu, 641114, India.
authors.forename: Periyasami
authors.initials: P
authors.lastname: Gnanaprakasam
keywords: electrochemistry; manganese; oxidation; sodium; supercapacitors