title: Core-double shell ZnO/ZnS@Co3O4 heterostructure as high performance pseudocapacitor.
abstract: In recent times, a great deal of attention has been paid to the balanced design and fabrication of core-shell heterostructures for enhanced pseudocapacitor (SC) performance. In this paper, we report the synthesis of ZnO@Co3O4 based core-shell heterostructures with controllable shell thickness for the first time by a simple low-temperature solution-based method and their detailed electrode performance as SC wherein a highly enhanced pseudocapacitance of 296 C g(-1) at a current density of 0.5 A g(-1) has been observed. Further, modifying the surface of ZnO by its sulfur analogue (i.e., by creating a ZnO/ZnS heterostructure), an improved capacitance of 317 C g(-1) at a current density of 0.5 A g(-1) for ZnO/ZnS@Co3O4 has been obtained along with a better rate performance. This is attributed to an efficient charge transfer from ZnS to ZnO. Impressively, the core-double shell heterostructure exhibits high energy density of 36 Wh kg(-1) at a power density of 204.3 W kg(-1). Even at a very high power density of 10.9 kW kg(-1), it shows an energy density of 14.7 Wh kg(-1). To the best of our knowledge, this is the first study of the electrochemical properties of ZnO/ZnS@Co3O4 heterostructure.
authors.affiliation: Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India. sspdb@iacs.res.in.
authors.forename: Sanjit
authors.initials: S
authors.lastname: Sarkar
authors.affiliation: Fuel Cell & Battery Division, CSIR-Central Glass & Ceramic Research Institute, Kolkata-700 032, West Bengal, India.
authors.forename: Sandipan
authors.initials: S
authors.lastname: Maiti
authors.affiliation: Fuel Cell & Battery Division, CSIR-Central Glass & Ceramic Research Institute, Kolkata-700 032, West Bengal, India.
authors.forename: Sourindra
authors.initials: S
authors.lastname: Mahanty
authors.affiliation: Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India. sspdb@iacs.res.in.
authors.forename: Durga
authors.initials: D
authors.lastname: Basak