Abstract
Sunlight is a non-polluting, inexpensive, and endlessly renewable source of clean energy, however, it can hardly be applied freely in demand. As a result, to store solar energy into another energy forms, such as hydrogen, is a more practical way for real applications. But hydrogen storage is a big problem in hydrogen application. We know that the current hydrogen storage mechanism requires low temperatures and high-pressure conditions. Among them, photocatalytic reactions based on electron-hole pair production in semiconductors can generate hydrogen without any CO2 or other pollution produced. It is well known that nano bubbles can live for a long time. The smaller bubbles have bigger pressure inside by Young-Laplace equation. Therefore we want to integrate hydrogen production and hydrogen storage by photocatalytic to generate nano hydrogen bubbles. This research focus on how to generate a large number of uniform hydrogen micron bubbles, and those bubbles can depart from surface. Experimental results demonstrated hydrophobic modified photocatalyst can produce a uniform hydrogen micron bubbles, but which are difficult to depart from surface. To help bubbles from the surface, eventually we set up a the ultrasonication in hydrogen bubbles production system by photocatalytic.