A long-term stable Pt counter electrode modified by POM-based multilayer film for high conversion efficiency dye-sensitized solar cells

ArticleinDalton Transactions 41(8):2227-30 · January 2012with10 Reads
Impact Factor: 4.20 · DOI: 10.1039/c2dt11897a · Source: PubMed
Abstract

A long-term stable Pt counter electrode modified by POM-based multilayer film has been fabricated by the electrochemical deposition method, which can markedly increase short-circuit photocurrent, open-circuit voltage and the conversion efficiency when used in dye-sensitized solar cells (DSSCs).

    • "A miniemulsion polymerization was also developed to incorporate POMs into PS latex, providing POM protection towards aqueous environment [241]. Another convenient strategy to effectively disperse polyanions into hybrid materials consists in the exchange of their counterions with positively charged polyelectrolytes (polyallylammonium, poly(diallyldimethylammonium), polyviologens, cationic dendrimers, and dendrons)242243244245, or polymers such as polyethyleneimine, poly(4-vinylpyridine), polyaniline, chitosan in their quaternized/protonated form. In this way, a broad number of hybrid materials and thin films were prepared, including hierarchical layer-by-layer (LbL) structures, with applications as opto-electronic devices, catalysts, sensors and antibacterial surfaces [37,92,246247248249. "
    [Show abstract] [Hide abstract] ABSTRACT: The covalent incorporation of inorganic building blocks into a polymer matrix to obtain stable and robust materials is a widely used concept in the field of organic-inorganic hybrid materials, and encompasses the use of different inorganic systems including (but not limited to) nanoparticles, mono-and polynuclear metal complexes and clusters, polyhedral oligomeric silsesquioxanes (POSS), polyoxometalates (POM), layered inorganic systems, inorganic fibers, and whiskers. In this paper, we will review the use of two particular kinds of structurally well-defined inorganic building blocks, namely transition metals oxoclusters (TMO) and polyoxometalates (POM), to obtain hybrid materials with enhanced functional (e. g., optical, dielectric, magnetic, catalytic) properties.
    Full-text · Article · May 2014 · Materials
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    • "[23] [24] [25] In previous research, POMs have been introduced into the solar photovoltaic system, which act as the electron acceptor and play the role of electron transmission as mediators, which are based on the consideration of the LUMO energy level of these POMs that are lower than that of conduction band of TiO 2 .[26] [27] [28] [29] [30] Meanwhile, POMs would transform into the electron donor after they are reduced to heteropoly blue.[31] However, the energy level including LUMO and HOMO level of POMs could be adjusted by controlling their structures or compositions and meanwhile the light response of POMs could be regulated by introducing certain transitional elements.[32] "
    [Show abstract] [Hide abstract] ABSTRACT: Abstract Keggin-type polyoxometalates (POMs) based photosensitizer [(CH3)4N]5[PW11O39RhCH2COOH]∙6H2O (PW11Rh-COOH) was firstly explored for assembling the POMs sensitized solar cells (PSSC). Electrochemical measurement, UV–vis diffuse reflectance spectrum, Surface photovoltage spectrum, and X-ray photoelectron spectroscopy demonstrated that PW11Rh-COOH displayed higher photovoltaic response than that of other POMs because of the better visible-light response, energy level matching and higher carrier separation efficiency.
    Full-text · Article · Dec 2013 · Inorganic Chemistry Communications
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    • "Polyoxometalates (POMs) are an important and structurally diverse class of metal-oxide clusters which have been found to be extremely versatile inorganic building blocks for the construction of functional materials with potential applications in catalysis [20,21], medicine [22], and materials science2324252627282930313233343536. Recently, several groups have incorporated POM into a dye-sensitized solar cell, and observed enhanced photovoltaic response282930313233343536 . These facts could provide important fundamental data for practical applications of materials in photoelectric conversion devices. "
    [Show abstract] [Hide abstract] ABSTRACT: A photoelectric conversion film consisting of sandwich-type tetracadmium(II) tungstophosphorate [P2W18Cd4(H2O)2O68]10− (P2W18Cd4) and a bichromophore hemicyanine of (E)-1,1′-(hexane-1,6-diyl)bis(4-((E)-2-(4-(dimethylamino)naphthalen-1-yl)vinyl)pyridinium) bromide (N6) was prepared by electrostatic self-assembly technique, and characterized by UV–vis spectroscopy, cyclic voltammetry and photoelectrochemistry. The UV–visible spectra showed that the film was uniformly deposited and N6 molecules formed J-aggregations in the films. The cyclic voltammetry showed that the P2W18Cd4 and N6 in the films were electrochemically active with surface-confined characteristics. As irradiated with white light, the (P2W18Cd4/N6) monolayer film gave stable cathodic photocurrent that is 2.4- and 6.7-fold as great as electrostatically self-assembled monolayer film of (P2W18Cd4/H6) {H6 = (E)-1,1′-(hexane-1,6-diyl)bis(4-(4-(dimethylamino)styryl)pyridinium) bromide} and Langmuir–Blodgett monolayer film of analogous hemicyanine (E)-4-(2-(4-(dimethylamino)naphthalen-1-yl)vinyl)-1-octadecylpyridinium iodide. The photocurrent action spectrum indicated that the cathodic photocurrent was generated based on charge transfer excitation of the N6 in the film. The effects of applied bias voltages, electron acceptor, and layer numbers of the (P2W18Cd4/N6)n films on photocurrent generation of (P2W18Cd4/N6)n film were examined.
    Full-text · Article · Mar 2013 · Electrochimica Acta
    0Comments 14Citations
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