Methylene blue and metformin photocatalytic activity of CeO2-Nb2O5 coatings is dependent on the treatment time of plasma electrolytic oxidation on titanium

Heterogeneous Photocatalysis with Niobium Doped-Titanium Substrates Treated by Plasma Electrolytic Oxidation

“…PEO treatments were performed in a water-cooled stainless-steel vessel as previously described by Orsetti et al 17 , using a pulsed bipolar voltage source (MAO 30, Plasma Technology LTD).…”

Alumina Coatings Containing Niobium Pentoxide Polymorphs Prepared by Plasma Electrolytic Oxidation of Aluminum

“…PEO coatings consisting of niobium oxides can be prepared directly by anodizing niobium foils [ 27–33 ] or by anodizing another metal substrate in the presence of Nb compounds in the electrolyte. [ 5,34 ] The main advantages of the second approach are as follows: 1) decreases the cost of the coating synthesis because pure niobium substrates are relatively expensive, 2) combines with other different oxides to tailor a specific property, and 3) produces a highly valuable composite when combining with a cheap substrate. In this sense, low‐cost aluminum PEO coatings with Nb content, especially forming Nb 2 O 5 , can be produced and explored in several applications, [ 31,32,35–37 ] including the photodegradation of organic compounds for environmental remediation.…”

“…[3] Due to its photocatalytic properties, recent studies have also explored its use as a photocatalyst. The high number of oxygen defect sites (10 À19 cm À3 ) [4] and bandgap energy close to the anatase-TiO 2 (3.4 eV) [2,5] turn this semiconductor attractive as a photocatalyst in different systems. Some studies have described the photocatalytic properties of Nb 2 O 5 produced by several chemical routes and its use as a suspension with the material to be degraded.…”

“…[13,18] PEO coatings consisting of niobium oxides can be prepared directly by anodizing niobium foils [27][28][29][30][31][32][33] or by anodizing another metal substrate in the presence of Nb compounds in the electrolyte. [5,34] The main advantages of the second approach are as follows: 1) decreases the cost of the coating synthesis because pure niobium substrates are relatively expensive, 2) combines with other different oxides to tailor a specific property, and DOI: 10.1002/adem.202201284 This study explores the experimental parameters related to the production of Nb 2 O 5 over alumina coatings produced by plasma electrolytic oxidation (PEO) and evaluates its use in photocatalytic applications. The influence of niobium precursor concentration and the electrolyte temperature on the electrochemical, morphological, and compositional responses are investigated using chemometric tools.…”

Anodization Time Effect on Silver Particles Deposition on Anodic Oxide Coating over Al Produced by Plasma Electrolytic Oxidation

“…Different from the conventional anodization, a high applied voltage is imposed in the anode to promote the oxide dielectric breakdown, which favors the incorporation of species from the electrolyte into the oxide films due to simultaneous events occurring during PEO processes, such as localized destruction/rebuilding of oxide, electric discharges, plasma formation, gas evolution, Joule heating, and cooling [1,6,7]. Adding specific ions or particles in the electrolyte can modify the coating properties [8][9][10][11], tailoring them to a particular interest or industrial application. Additionally, this technique Plasma 2023, 6 236 is advantageous in terms of synthesis duration, allowing the fabrication of alumina coatings for different purposes in a fast one-step fabrication method.…”