Electrosynthesis of metallic molybdenum from water deficient solution containing molybdate ions and high concentrations of acetate

Electrochemical Evolution of Pore-Confined Metallic Molybdenum in a Metal–Organic Framework (MOF) for All-MOF-Based Pseudocapacitors

“…The CV curve becomes stable after 30 cycles of scan, and the resulting electrochemical activity of the thin film after such an electrochemical “activation” process is much higher than that of the fresh Mo-SIM-MOF-808 thin film. As the potential window shown in Figure is already negative enough to reduce Mo­(VI) to metallic Mo at a neutral pH, − the remarkable increase in electrochemical activity during CV scan observed in Figure may be attributed to the formation of metallic Mo. Controlled experiments of the same CV scan subjected to the pristine MOF-808 thin films show no evolution of Faradaic current (Figure S4).…”

“…As it was already reported that MOF-808 is chemically stable in aqueous solutions with neutral and acidic pH, the effect of pH on the electrochemical activity of the Mo@MOF-808 thin film is investigated at the pH values of 7.3, 6.0, and 4.5. As shown in Figure S8, the electrochemical activity decreases obviously with a decreasing value of pH; this observation should be attributed to the fact that a higher concentration of protons in the electrolyte can facilitate the reduction of Mo­(VI) to form metallic Mo according to the reported mechanism. − Therefore, the MOPS buffer solution with a pH value of 7.3 was selected as the electrolyte for further electrochemical experiments.…”

“…One broad and ill-defined cathodic peak located at around −0.8 V and one well-defined anodic peak centered at −0.7 V can be observed in the stable CV curve of Mo@MOF-808. This set of redox peaks is attributed to the reversible Faradaic reactions between Mo­(VI) and metallic Mo occurring in the neutral aqueous solution. , CV curves of Mo@MOF-808 measured at various scan rates are shown in Figure b. As the anodic peaks in these CV curves are more well-defined compared to the cathodic peaks, values of anodic peak current density ( J pa ) can be extracted from Figure b and plotted with scan rate ( v ) and the square root of scan rate ( v –0.5 ).…”

Electrodeposited and then acetate‐processed Ni(OH) 2 /NiOOH composites for enhanced electrocatalytic oxidation of urea

“…After that, continuing to increase concentration, the corresponding current decreases. On the one hand, the acetate can be complex with nickel ion, and has a diffusion effect to enhance the activity of the deposition on a nickel surface [21, 22]. On the other hand, it increased the stability of nickel deposition, so that it is not easy to fall off during the electrochemical test in the later stage.…”

Corrosion and catalytic properties of electrodeposited nanocrystalline molybdenum

“…They successfully deposited nanocrystalline Mo coatings with a maximum thickness of 20 µm. The work [5] was extended to the evaluation of hardness in 2015 by Syed et al [12] and in 2019 by Hasan et al [13]. In the study by Syed et al [12], annealing increased the hardness of Mo coatings from 2186 MPa to 4187 MPa, whereas in the study by Hasan et al [13] increasing the applied current density increased the hardness from approximately 5400 MPa to 6400 MPa.…”