Photoelectrochemical cells based on emeraldine base form of polyaniline

Abstract

Células fotoeletroquímicas (PECs) têm sido fabricadas usando a forma base esmeraldina de polianilina (EB) como um material fotoativo e o par redox Eu 2+ /Eu 3+ em metanol como eletrólito. Uma célula fotoeletroquímica com a estrutura: Vidro/ITO/ EB:Nc-TiO 2 /Eletrólito/ Pt produz uma voltagem de circuito-aberto (V OC ) de -0,132 V e uma corrente de curto-circuito (I SC ) de 0,64 µA cm -2 sob 50 mW cm -2 de iluminação com luz branca de lâmpada de Xe. Num esforço para aumentar a foto-resposta, uma PEC com estrutura: Vidro/ITO/ EB:Nc-TiO 2 / Eletrólito/Pt foi construída, na qual um filme composto de EB e TiO 2 (Nc-TiO 2 ) nanocristalino é usado como material fotoativo. A célula mostra uma V OC de -0,205 V e uma I SC de 105 µA cm -2 quando iluminada sobre as mesmas condições.Photoelectrochemical cells (PECs) have been fabricated using the emeraldine base form of polyaniline (EB) as a photoactive material and Eu 2+ /Eu 3+ redox couple in methanol as an electrolyte. A PEC with a structure: Glass/ITO/EB/electrolyte/Pt produces an open-circuit voltage (V OC ) of -0.132 V and a short-circuit current (I SC ) of 0.64 µA cm -2 under 50 mW cm -2 white light illumination from Xe lamp. In an effort to increase the photoresponse, a PEC with a structure: Glass/ITO/EB:Nc-TiO 2 /Electrolyte/Pt has been devised in which a composite film of EB and nanocrystalline TiO 2 (Nc-TiO 2 ) is used as a photoactive material. The cell shows a V OC of -0.205 V and an I SC of 105 µA cm -2 when illuminated under the same conditions.

Fluorescent Paper Strips for Highly Sensitive and Selective Detection of Nitroaromatic Analytes in Water Samples

“…CV measurement is one of the widely used experimental approaches . Onset oxidation and reduction potentials are used to estimate the HOMO and LUMO levels using an empirical formulation.…”

“…CV measurement is one of the widely used experimental approaches. [33][34][35] Onset oxidation and reduction potentials are used to estimate the HOMO and LUMO levels using an empirical formulation. In our experiments, ferrocene is used as the reference, which is a common reference with the known ferrocene value of À4.4.…”

“…Based on the cyclic voltammetry results (Figure B) and Equation 1 and 2, HOMO and LUMO values of PANI−Py system were determined to be −5.72 eV and −2.38 eV, respectively with band gap energy (Eg) of 3.34 eV and HOMO/LUMO levels of the PANI−Py system and the main aromatic compounds are given in the Figure A . According to these results, it can be said that these values may be suitable for the detection of TNT via PANI−Py fluorescent polymer.…”

The Ethanol-induced Interfacial Reduction of a Europium Complex on SiO2Nanoparticles

“…After sintering, the energy level was shifted to the higher energy side, to a value of ¹4.0 eV, corresponding to the HOMO level of the divalent Eu oxide. 11 That is, reduction from Eu 3+ to Eu 2+ occurred at the interface. Taking into account the oxidation potential of the adsorbed ethanol, the Eu ions at the interface between the phen ligands and the SiO 2 nanoparticles were evidently reduced by the adsorbed ethanol through a thermally activated process.…”

Fluorescence of polyaniline films on electrode surfaces: Thickness dependence and surface influence

“…Aryl amine conducting polymers, such as polyaniline (PANI), show interesting optical properties (such as electrochromism and fluorescence) leading to a number of proposed applications such as sensors, displays and other optoelectronic devices [1][2][3][4][5][6][7][8][9][10][11][12][13]. PANI and similar polymers show photoluminescence in their reduced state, which decreases when the polymer is oxidized [14][15][16][17][18][19].…”