Investigation of Photocatalytic Decomposition Mechanism of Organic Compounds on Platinized Semiconductor Catalyst by Rotating Ring Disk Electrode Technique

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Abstract
Through TEM observations it was established that the lead acid battery active mass crystals have a nonhomogeneous mass distribution and contain some defects in their crystal lattice. By electron diffraction analysis of the active mass agglomerates and individual crystals it was determined that is formed in the long and needle‐like crystals, while is formed in the short and slab‐like crystals often with a nonuniform shape. During plate discharge, besides the crystals, fine orthorhombic crystals are formed as well. This fact is explained by the proton‐electron mechanism of reduction. The difficult penetration of ions into the agglomerates' micropores causes alkalization of the solution in them and creates conditions for the formation of . Since the molar volumes of and are almost equal, the transport of H+ ions and of water along the agglomerates' micropores is not impeded by the reduction . This reaction allows the crystals in the agglomerates' interior to take part in the discharge process, thus a high coefficient of active mass utilization is achieved. When the discharge is stopped, reacts with forming .

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