TiO_2光电极表面气泡相互作用规律研究  

Study on Bubble Interaction on TiO_2 Photoelectrode

作　　者：陈娟雯 郭烈锦[1] 胡晓玮[1] 曹振山 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《工程热物理学报》2018年第3期550-554,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金重点项目(No.51236007);国家自然科学基金优秀重点实验室研究项目(No.51323011)

摘　　要：本文对纳米棒阵列TiO_2光电极表面气泡活性成核中心及气泡间相互作用进行了实验研究,观察气泡间相互作用规律及其对光电体系的影响。实验发现在Marangoni效应作用下,反应区域电极表面附近流体形成四周流向反应区域中心的流场结构,使得反应区域中心产生的气泡对周围气泡有吸引作用,促使气泡聚并。与单气泡生长周期相比,气泡活性中心的活化作用提供了稳定的气泡来源,使气泡的生长周期变短,析气效率上升,平均过电势下降。In this study, the interaction of bubbles evolving on Ti02 photoanode is experimentally studied. It is found that the bubbles generated in the center of reaction zone attract the bubbles nucleated on the surface defect, resulting in bubble collision and coalescence. Marangoni convection is analyzed to play an important role in the bubble interaction. When the bubble coalescence occurs, the bubble evolving cycles become shorter and stable, which increases the bubble evolving efficiency and further reduces the saturation on the surface as well as the overnotential.

关 键 词：析气反应 光电解水 气泡聚并 MARANGONI效应 

分 类 号：O359[理学—流体力学]