NiFe_2O_4基惰性阳极的润湿性及气泡析出行为

Bubble Behavior and Wettability of NiFe_2O_4-based Inert Anodes

利用座滴法和双室透明电解槽对NiFe2O4基惰性阳极的润湿性和气泡析出行为进行研究。结果表明,电解质对NiFe2O4基惰性阳极的润湿性要优于碳素阳极。在低电流密度情况下电解,阳极气泡的析出是一个动态过程,它先在阳极表面形核,以球形方式长大,小气泡在长大过程逐渐汇聚偏移,然后逸出。惰性阳极上析出的气泡尺寸比碳素阳极小,在阳极上的逗留时间也更短。大电流密度情况下,气泡的生成速度加快,尺寸降低,很难准确测量气泡的直径。

Bubble behavior and wettability of NiFe2O4-based inert anodes were investigated by applying twocompartment see-through quartz electrolysis cell and sessile drop method.The results show that NiFe2O4-based inert anode can contact electrolyte better than carbon anode.Bubble releasing is a dynamic process as presented in the electrolytic experiment carried out under low current density.Forming first at the bottom of anode surface,bubbles then grow and coalesce into a single large one,which finally releases from anode surface.The bubble size produced from NiFe2O4 anodes is smaller than that from carbon anodes.The detention time of bubbles on bottom surface of inert anodes is shorter than that on carbon anodes.Production of bubbles is accelerated with high current density.Bubble size is smaller for accelerated electrolysis,making it difficult to measure bubble diameter.