Determining the Sparking Voltage of Working Electrolytes

Abstract

Sparking voltage is a vital parameter of the working electrolytes for aluminum electrolytic capacitors, which determines the operating voltage of the capacitors. However, the existing methods for measuring the sparking voltage suffer from low accuracy, bad reproducibility, high artificial error, etc. Here, we report a versatile approach for determining the sparking voltage of the electrolytes. By a linear fitting procedure, the voltage-time data acquired from the test experiments were transformed into a correlation coefficient-time curve. Because the abrupt correlation coefficient change due to the occurrence of sparking could be more readily identified in the correlation coefficient-time curve, the limit voltage of the electrolyte was accurately determined. Thus, this voltage was subtracted from the infrared drop in the solution to get the true sparking voltage of the electrolyte. This method prevented artificial errors arising from the direct observation or listening of sparking features, by which reliable and reproducible results can be gained by a computer program. This study provides an active support for the development of high-performance working electrolytes.

Real Role of Fluoride Ions in the Growth of Anodic TiO2 Nanotubes

“…However, the oxide near the metal substrate still constitutes the barrier oxide layer. When the barrier oxide layer reaches a critical thickness, the violent collision of ions generates the initial avalanche electronic current. − This sudden increase in the total current creates an inflection point on the current–time curve. With the increase in electronic current, the oxygen bubble generation reaction triggered by the electronic current intensifies and oxygen bubbles are generated at the interface between the anionic contaminated layer and the barrier oxide layer.…”