Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 123, Issue 17, Pages 10849-10856Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.8b10920
Keywords
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Funding
- Gateway Fellowship from the Research School PLUS of the Ruhr Universitat Bochum
- Italian Ministry of Education, Universities and Research (Ministero dell'Istruzione, dell'Universita e della Ricerca - MIUR) through the program Rita Levi Montalcini 2016
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This work investigates the effect of current density on the hydrogen gas bubble formation during electrolysis on a platinum electrode. Local detection of bubble evolution was performed electrochemically by using a hydrogen-collecting microelectrode placed in close proximity of a larger hydrogen-generating platinum electrode. The micro-electrode probe locally measured the concentration of dissolved molecular hydrogen produced during electrolysis. In acidic conditions, it was found that at low electrolysis currents the concentration of dissolved hydrogen could temporarily rise up to 50 times the saturation level, while once a large current was reached, the concentration dropped, increasing the concentration of hydrogen inside gas bubbles, and became independent of the current. Through laser reflectance, the onset of bubble formation was found (similar to-0.7 mA/cm(2)), which was lower than the first bubble observable by naked eye or detected by the microelectrode probe.
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