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- W170814545 abstract "Physical events associated with the evolution of hydrogen and oxygen at electrode surfaces in concentrated sulfuric acid and potassium hydroxide solutions were observed and recorded by flash photography. A technique for photographing the electrode surface shortly after current initiation (13-300 ms) provided a view unobstructed by rising gas bubbles. Bubble growth rate, number density, and maximum bubble size data were obtained for gas generation rates in the range 3.5 - 14 cm/sup 3//cm/sup 2/ min, corresponding to current densities for hydrogen evolution of 0.5 to 2 A/cm. The velocity of the rising gas emulsion and degree of gas bubble coalescence within it were also observed. The growth characteristics of bubbles depend strongly on the electrolyte composition, different for hydrogen and oxygen in the same electrolyte. In the range studied, increasing the gas generation rate does not change the character of the events, only the rate of their occurrence. Bubble growth before separation involves repeated sequences of coalescences. Comparison of estimates of the sizes that bubbles should reach under equilibrium growth conditions with those observed reveals that separation is controlled by the dynamics of bubble interactions. Altering the surface condition of the electrode showed that the microscopic roughness of a planar electrode has little effect on the character of gas evolution. The electrolyte velocitygenerated by the rising gas bubble stream is primarily a function of gas generation rate and is not overly dependent on the character of gas evolution. An extreme sweeping action, or ''scavenging effect'', of gas bubbles rising along the electrode surface occurs extensively in sulfuric acid electrolyte. (auth)" @default.
- W170814545 created "2016-06-24" @default.
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- W170814545 date "1975-10-01" @default.
- W170814545 modified "2023-10-14" @default.
- W170814545 title "Studies of the events occurring at gas-evolving electrodes" @default.
- W170814545 doi "https://doi.org/10.2172/7199712" @default.
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