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  • Fabrication and electrocatalytic activities of porphyrin and 12-molybdophosphoric acid hybrid films.

Fabrication and electrocatalytic activities of porphyrin and 12-molybdophosphoric acid hybrid films.

Journal of colloid and interface science (2010-08-19)
Dawei Fan, Guobao Li, Jingcheng Hao
ABSTRACT

Hybrid films composed of oppositely charged Keggin-type 12-molybdophosphoric acid H(3)PMo(12)O(40).nH(2)O (PMo(12)) and water-soluble cationic meso-tetra (N-methyl-4-pyridyl) porphinetetratosylate (TMPyP) were fabricated onto silicon and ITO substrates by a layer-by-layer (LbL) self-assembly technique. The LbL films were characterized by UV-vis spectroscopy, X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and cyclic voltammetry (CV). The electrochemical properties of the prepared multilayer films were controlled by adjusting the solution pH. Moreover, with increase in the layer number of TMPyP/PMo(12), the electrocatalytic current toward the reduction of IO(3)(-) was enhanced. The LbL films also displayed good electrocatalytic activities toward the reduction of BrO(3)(-), IO(3)(-) , and S(2)O(8)(2-).

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Phosphomolybdic acid solution, spray reagent, 10% in ethanol
Sigma-Aldrich
Phosphomolybdic acid solution, 20 wt. % in ethanol
Sigma-Aldrich
Phosphomolybdic acid solution, ready-to-use spray and plunge reagent, for chromatography
Sigma-Aldrich
Sodium phosphomolybdate hydrate, technical
Sigma-Aldrich
Phosphomolybdic Acid Solution