Highly energetic impact of H2 and O2 nanobubbles on Pt surface
Autor: | I. V. Uvarov, P. S. Shlepakov, Vitaly B. Svetovoy, A. V. Postnikov |
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Rok vydání: | 2021 |
Předmět: |
Materials science
Electrolysis of water Polarity (physics) Scanning electron microscope chemistry.chemical_element Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Colloid and Surface Chemistry chemistry Chemical physics Electrode Surface modification 0210 nano-technology Platinum |
Zdroj: | Journal of Colloid and Interface Science. 582:167-176 |
ISSN: | 0021-9797 |
Popis: | Hypothesis Water electrolysis performed by short ( ≲ 5 μ s) voltage pulses of alternating polarity generates a dense cloud of H2 and O2 nanobubbles. Platinum electrodes turn black in this process, while they behave differently when the polarity is not altered. We prove that the modification of Pt is associated with highly energetic impact of nanobubbles rather than with any electrochemical process. Experiments Nanobubbles are generated by planar Pt or Ti microelectrodes. The process is driven by a series of alternating or single polarity pulses. In the case of Ti electrodes a Pt plate is separated by a gap from the electrodes. Nanoparticles on the surface of platinum are investigated with a scanning electron microscope and elemental composition is analysed using an energy-dispersive X-ray spectrometer. Findings Vigorous formation of Pt nanoparticles with a size of 10 nm is observed when the process is driven by the alternating polarity pulses. The effects of Pt corrosion have different character and cannot explain the phenomenon. Similar nanoparticles are observed when the Pt plate is exposed to a stream of nanobubbles. The process is explained by spontaneous combustion of hydrogen and oxygen nanobubbles on Pt surface. The phenomenon can be used to remove strongly adhered particles from solids. |
Databáze: | OpenAIRE |
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