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Fabrication of Electrocatalyst for Oxygen Nanobubble Production by Electrochemical Method

Mohseni Moghaddam, Fatemeh | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57936 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Dolati, Abolghasem
  7. Abstract:
  8. By fabricating nanoscale materials, including nanowires, superior and distinct properties can be obtained from the constituent metal or alloy. In this project, the goal is to produce oxygen nanobubbles by fabricating platinum nanowires in polycarbonate template cavities using electrochemical deposition. Then, the structure and morphology of nanowires with a 100 nm pore diameter were investigated using field emission scanning electron microscopy (FE-SEM) and EDX methods, and oxygen nanobubbles were produced using electrochemical chronoamperometry and voltammetry methods, and the Tyndall effect was investigated to investigate the presence of nanobubbles, additionally dynamic light scattering (DLS) was used to examine the grain size distribution and zeta potential, and finally, electrochemical voltammetry was performed to further confirm the presence of nanobubbles. In order to deposit platinum in the form of nanowires, polycarbonate templates with a 100 nm pore diameter and a length of 6 microns were used. The density of the pores is approximately 108 to 1010 pores per square centimeter. FE-SEM images of platinum nanowires at a potential of -0.45 V for about 77 minutes showed that the nanowires had a cauliflower-like shape and protruded slightly from the template surface. The cyclic voltammetry curve used to determine the potential revealed that the current density gradually increases with increasing voltage. The potential range of 0.4 to 2 V relative to the calomel reference electrode was considered for the production of oxygen nanobubbles. In the chronoamperometric curves for nanobubble formation, the current density increased with increasing potential. The Tyndall effect confirmed the presence of oxygen nanobubbles. Furthermore, voltametric analysis showed a peak in the oxygen nanobubble solution due to the presence of nanobubbles, which caused an increase in current density. The results of the DLS experiment showed that at 8 seconds, the average particle size of oxygen nanobubbles at potentials of 0.4, 0.8, and 1.2 V was 47.4, 25.7, and 6.6 nm, respectively. After 20 seconds, the average particle size of oxygen nanobubbles at potentials of 0.4, 0.8, 1.2, 1.6, and 2 V was 69.6, 37.2, 21.2, 12.9, and 6.7 nm, respectively. At 8 seconds, the average zeta potential at potentials of 0.8 and 1.2 V was -17.1 and -32.3 mV, respectively. After 20 seconds, the average zeta potential at potentials of 0.8 and 1.6 V was -12.8 and -25 mV, respectively. In general, it can be concluded that higher voltages result in smaller nanobubbles, while longer electrolysis times lead to larger nanobubbles. The smaller the oxygen nanobubbles, the more negative the zeta potential and the greater their stability. Oxygen nanobubbles have many applications including water and wastewater treatment, cancer treatment and more, due to their unique properties such as small size and long-term stability
  9. Keywords:
  10. Nanowire ; Electrocatalysts ; Electrochemical Deposition ; Platinum ; Oxygen Nanobubbles

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