Principle of Shanghai Bilang Photolysis Hydrogen Production System.
Photocatalytic reactions can be divided into two types of "down energy barrier" (down hil1) and "uplift energy barrier" (uphil1) reactions. Photocatalytic oxidative degradation of organic compounds is a kind of energy barrier lowering reaction. In this type of reaction, △ G <0, the reaction process is irreversible. In this type of reaction, active groups such as O2-, HO2, OH ·, and H + are generated under the action of photocatalyst . The decomposition of water to generate H2 and O2 is a high energy barrier reaction. In this type of reaction, △ G> 0 (△ G = 237 kJ / mo1). This type of reaction converts light energy into chemical energy.
With the continuous growth of global energy demand and the declining reserve energy, research on the development of new energy has been imminent. Hydrogen energy, as a secondary energy source, has many advantages such as clean, efficient, safe, storable, and transportable. It is considered to be the most ideal green energy. Since 1972, professors Fujishima A and Honda K of the University of Tokyo in Japan first reported the phenomenon of photocatalytic decomposition of water by TiO2 single crystal electrode to generate hydrogen, which revealed the possibility of using sunlight to directly decompose water to produce hydrogen, and opened up the use of solar Research path of hydrogen production by photolysis of water. With the evolution of electrode electrolyzed water to semiconductor photocatalytic decomposition of hydrogen to produce heterogeneous photocatalysis (heterogeneous photocatalysis) and the successive discovery of photocatalysts other than TiO2, the emergence of photocatalytic method to decompose water to produce hydrogen (referred to as photolysis water) Research, and made great progress in the synthesis and modification of photocatalysts. As a necessary instrument for experimental research, the hydrogen production system of photolysis water also plays a pivotal role. However, in the large environment where the cottage and low-quality imitation products are raging in the Chinese market, the choice of experimental instruments still needs to be careful, otherwise it will be Deception by good manufacturers or distributors wastes limited scientific research funds and delays valuable experiment time.
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