Problems in DSA� coating deposition by thermal decomposition

Abstract

Several DSA | coatings were prepared by thermal decomposition of metallic chloride salts on titanium base. It was shown that the painting composition does not necessarily correspond to the final coating composition. Thermogravimetric and fluorescent X-ray measurements were used to identify and characterize the material losses. It was found that IrO2, Ta20 5 and RuO~ compounds can be deposited with almost 100% yield, while SnO~ and Pt precursors give high material losses. The influence of parameters affecting the deposition yield are discussed.

Novel Ti/Ta2O5-SnO2 electrodes for water electrolysis and electrocatalytic oxidation of organics

“…Several Ti/Ta 2 O 5 -SnO 2 electrodes were prepared by thermal decomposition of precursor solutions on titanium substrates [23]. The nominal composition Ta(x) -Sn(100 -x) of electrodes was modified by changing the x value from 0 atom (at.…”

Deposition efficiency in the preparation of ozone-producing nickel and antimony doped tin oxide anodes

“…The metal salts SnCl45H2O, SbCl3 and NiCl26H2O were dissolved in alcohol to the molar ratios of 1000: (16)(17)(18)(19)(20):(2-6) (Sn:Sb:Ni) [7,[9][10][11][12][13]15]. This precursor solution is then coated on a pre-treated titanium substrate (foil or mesh) by brush, dip or spray coating.…”

“…The melting point for the hydrous salt is 56 °C [19] and the boiling point for the anhydrous salt is 114 °C [19]. This low boiling temperature will lead to loss of tin during the preparation process, as described briefly by Comninellis et al [20] in a study concerning the problems in DSA® coating deposition by thermal decomposition. They reported the deposition efficiency for this salt (ηeff = moles of tin after heating / moles of tin added) to be 21 % when dissolved in the commonly used solvent ethanol.…”

“…To understand and mitigate the issue of the evaporating tin source, the preparation process was investigated using both the common tetravalent tin precursor SnCl45H2O and an alternative precursor salt, the divalent SnCl22H2O. The divalent salt has been reported to have a deposition efficiency of 57 % when dissolved in ethanol [20], and the boiling point for the anhydrous salt (623 °C) [19] is well separated from the preparation temperatures, so loss of tin in the form of SnCl2 will be avoided. The heating process was examined using TGDSC (coupled thermogravimetry and differential scanning calorimetry), and electrodes prepared using both precursor salts were investigated regarding morphology and composition.…”

Optimization of Ti/Ta2O5–SnO2 electrodes and reaction parameters for electrocatalytic oxidation of methylene blue

“…by a thermal decomposition and drop casting technique of the precursor solution onto a titanium substrate [23]. The 70 detailed preparation method is described elsewhere [22].…”