Dual purpose poly(3,4-ethylenedioxypyrrole)/vanadium pentoxide nanobelt hybrids in photoelectrochromic cells and supercapacitors

Reddy, B N and Mukkabla, R and M, Deepa and Ghosal, P (2015) Dual purpose poly(3,4-ethylenedioxypyrrole)/vanadium pentoxide nanobelt hybrids in photoelectrochromic cells and supercapacitors. RSC Advances, 40 (5). pp. 31422-31433. ISSN 2046-2069

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Abstract

Poly(3,4-ethylenedioxypyrrole) (PEDOP)/vanadium pentoxide (V2O5) nanobelt hybrid films were prepared for the first time. V2O5 nanobelts with a monoclinic structure were grown by a hydrothermal route and a PEDOT layer was coated onto V2O5 nanobelts by electropolymerization to yield the PEDOP/V2O5 hybrid. The hybrid showed a fourfold increment in electrical conductivity compared to the pristine oxide, and a work function of 4.71 eV (by Kelvin probe force microscopy), which was intermediate to that of PEDOP and V2O5. Both oxide and hybrid showed green-red luminescence. The PEDOP/V2O5 hybrid or V2O5 films were assembled into energy saving photoelectrochromic cells, by combining with a photovoltaic electrode of CdS/titania, and in response to 1 sun illumination for different durations, the hybrid showed a dynamic transmission modulation (ΔT), as it switched from a yellow to a dark green optical state, without the application of any external bias, by simply consuming the electrical current produced by the irradiated CdS/titania. The hybrid exhibited a maximum ΔT of 65.5% at 475 nm, which was greater by 82% compared to pristine V2O5 at the same wavelength. The ability of PEDOP to provide facile conduction pathways for fast and improved electron transfer and transport in the PEDOP/V2O5 hybrid, enhances the optical contrast produced. The versatility of the hybrid was established by assembling asymmetric supercapacitors with the hybrid or polymer or oxide and a liquid electrolyte. The synergistic effects of PEDOP (high electrical conductivity) and V2O5 nanobelts (large surface area) and their ability to store/release charge by undergoing reversible Faradaic reactions were reflected in a high specific capacitance of 224 F g-1 delivered by the hybrid, higher by 83% and 69% relative to pristine V2O5 and PEDOP. The hybrid shows an energy density of 223 W h kg-1 at a power density of 3.8 kW kg-1, and an acceptable cycling performance with 90% capacitance retention after 5000 cycles. The PEDOP/V2O5 hybrid is useful for advanced next-generation self-powered electrochromic smart windows and supercapacitors.

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IITH Creators:

IITH Creators	ORCiD
M, Deepa	UNSPECIFIED

Item Type:

Article

Uncontrolled Keywords:

Cadmium sulfide; Capacitance; Capacitors; Electric conductivity; Electrolytic capacitors; Electropolymerization; Energy conservation; Solar power generation Asymmetric supercapacitor; Capacitance retention; Electrical conductivity; High electrical conductivity; High specific capacitances; Kelvin probe force microscopy; Monoclinic structures; Transmission modulation

Subjects:

Chemistry

Divisions:

Department of Chemistry

Depositing User:

Team Library

Date Deposited:

28 Apr 2015 08:56

Last Modified:

18 Oct 2017 07:15

URI:

http://raiithold.iith.ac.in/id/eprint/1470