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Light Emission from Pt during High‐Voltage Cathodic Polarization

“…From the results of spectral analysis of a similar plasma-electrode system, the temperature of the plasma layer was estimated to be in the range of several thousands of kelvin to ten thousand kelvin. 6,7 The light emission shown in Fig. 2 and 4 probably originates from the plasma state of the vapor layer, which is maintained when T WE exceeds T b , although its thickness and temperature are unknown.…”

“…If the light emission originates from elements in the plasma state existing in the vapor layer, its spectrum would be expected to contain atomic or molecular spectral lines. For example, Kobayashi et al 6 found that the light spectra from Pd electrodes in the cathodic pulse discharge contain emission lines of Li and H atoms. Figure 7 shows the light emission spectra from the Pt electrodes during glow, strong glow, and spark discharges in various electrolyte solutions.…”

“…The emission of light from metal electrodes in aqueous solutions has been observed in electropolishing and electrodischarge of metal electrodes. [1][2][3][4][5][6][7] This type of light emission is thought to be associated with the electrodischarge process that occurs between a working electrode and an electrolyte solution. Hickling and Ingram 1,2 reviewed this phenomenon of light emission from a glow discharge electrode (GDE) or a contact glow discharge electrode (CGDE) in which a high-temperature plasma sheath was formed around the electrode surface in contact with an electrolyte solution, due to a high electric field, accompanied by a glow discharge photoemission.…”

“…This situation sometimes results in the formation of reaction products with nonfaradaic efficiency, as reported by Sengupta et al 9,10 Characterization of the light emission in electrodischarge processes, such as arc and spark discharge in electrolyte solutions, has been investigated in the fields of electrical engineering and plasma physics, where the light emission has been attributed to elements in a plasma state. [3][4][5][6] From spectral analysis, the temperature of the plasma state was evaluated to be several thousands of kelvin. 7 In the presence of deuterium in aqueous electrolyte solutions, emission of light was observed not only with photons but also with neutrons, and this radiation is thought to be due to a reaction that occurs at extremely high temperatures of plasma.…”