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• W3206741842 endingPage "105796" @default.
• W3206741842 startingPage "105796" @default.
• W3206741842 abstract "In electrochemical processes, gas bubbles on the electrode can cause an increase in both overpotential and ohmic voltage drop which leads to higher energy consumption. Applying power ultrasound during water electrolysis can help to reduce the overpotential, enhance mass transfer, and save energy. In this study, we investigated the effect of ultrasound (20 kHz) on the hydrogen evolution reaction (HER) on a stainless steel plate with varying concentrations of NaOH solutions at 298 K, using linear sweep voltammetry (LSV). We especially focused on understanding the bubble behavior on the stainless steel plate during HER using high-speed imaging in ultrasonic field. When ultrasound was applied to solutions with NaOH concentrations of 0.1, 0.5, 1 M, the current density increased by about 9.0, 5.9, 2.8 %, respectively. As the ultrasound irradiation began, the bubbles tended to hover around on the electrode surface, coalescing with other bubbles, rather than rising. When the size of the coalesced bubbles became too large to stay on the surface of the electrode, they were expelled from the ultrasonic field. The repeated collapse and coalescence of these bubbles was observed while they were rising. The velocity increased about 2 times when ultrasound irradiation began, and increased by more than 6 times in the ultrasonic field. More nucleation of bubbles was observed on the electrode in the ultrasonic field. Using ultrasound reduced the critical diameter of bubbles which detached from the electrode, from 58.0 to 15.9 μm, and the residence time of the bubbles, from 533 to 118 ms. Further, when the ultrasound was applied, the mean diameter of bubbles decreased from 71.8 to 17 μm. Hence, bubble coverage on the electrode surface decreased from 8.3 to 1 % despite an increase in the total number of bubbles. As a result, ultrasound was found to be effective for hydrogen production during water electrolysis, increasing current by the faster removal of gas from the stainless steel plate." @default.
• W3206741842 created "2021-10-25" @default.
• W3206741842 creator A5026619786 @default.
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• W3206741842 date "2021-12-01" @default.
• W3206741842 modified "2023-10-06" @default.
• W3206741842 title "Hydrodynamic behavior of bubbles at gas-evolving electrode in ultrasonic field during water electrolysis" @default.
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• W3206741842 doi "https://doi.org/10.1016/j.ultsonch.2021.105796" @default.
• W3206741842 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8529173" @default.
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• W3206741842 hasPublicationYear "2021" @default.
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