Electrochemical Multi-Coloration of Molybdenum Oxide Bronzes

Abstract

We report a simple electrochemical approach in fabricating multiple colored molybdenum (Mo) oxide bronzes on the surface of a Mo-quartz electrode. A three step electrochemical batch process consisting of linear sweep voltammetry and anodic oxidation followed by cathodic reduction in neutral K2SO4 electrolyte at different end potentials, viz. −0.62, −0.80 and −1.60 V (vs. Hg/HgSO4) yielded red, blue and yellow colored bronzes. The samples produced were analyzed by XRD, EDS, and SIMS. The color variation was suggested to be associated with the cations intercalation into the oxide formed and the simultaneous structural changes that occurred during the cathodic reduction in neutral aqueous medium.

Review—Photoelectrochemical Cathodic Protection in The Dark: A Review of Nanocomposite and Energy-Storing Photoanodes

“…Metallic Mo (with thin surface oxides) coated FTO glass was used for the studies. [109][110][111][112][113][114] Having a layered structure, a higher C p of WO 3 or MoO 3 is linked with a high rate of intercalation of protons/cations into the inter-layer gaps/tunnels. It is evident from Fig.…”

α-MoO3 as a Conductive 2D Oxide: Tunable n-Type Electrical Transport via Oxygen Vacancy and Fluorine Doping

“…However, oxides offer a broad range of interesting properties which can be modified through doping to adopt new characteristics. − Molybdenum trioxide, MoO 3 , is one such TMO that is currently being explored for its manipulable electronic properties . To date, this material has been used in systems such as hydrogen sensing and catalyzing hydrogen evolution reactions, electrochromism, biosensing, as a flexible electrode material in sodium-ion batteries and Li-ion batteries, in addition to arguably its most well-known function as an intermediate hole-injection layer in organic thin films . Crystalline MoO 3 has three different phases, the most stable of which is the orthorhombic alpha phase, α-MoO 3 .…”

Sodium–cesium molybdenum-oxide bronzes

“…The interest in alkali molybdenum oxide bronzes has grown recently due to their specific nonstoichio metric structure, properties, and application as elec trically conducting coatings, electrochromic materi als, sensors, emitters, electrodes, catalysts, and in other fields of modern engineering [1][2][3][4][5][6][7][8][9][10][11][12][13]. Much attention has been given to their nanoderivatives in the form of coatings, tubes, rods of sodium oxymolybdate com pounds, and so on [3].…”

“…Much attention has been given to their nanoderivatives in the form of coatings, tubes, rods of sodium oxymolybdate com pounds, and so on [3]. М 0.9 Mo 6 O 17 (M is Li, Na, K) bronzes display low dimensional electron properties and are semiconductors with a semiconductor-metal transition [12,14].…”