Shanghai Bilang talks about the inventor of hydrogen production technology by photolysis water

Shanghai Bilang talked about the inventor of the hydrogen production technology of photolysis water.

Hydrogen production from photolysis of water began in 1972. Professors Fujishima A and Honda K of the University of Tokyo in Japan reported for the first time that TiO2 single crystal electrode photocatalytically decomposes water to produce hydrogen, which reveals the direct decomposition of water by solar The possibility of hydrogen has opened up the research path of using solar energy to hydrolyze water to produce hydrogen. 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 for the decomposition of water to hydrogen Research, and made great progress in the synthesis and modification of photocatalysts.

Overview

In recent decades, with the continuous growth of global energy demand, research on finding new energy sources has attracted more and more attention. Hydrogen energy, as a secondary energy source, has many advantages such as clean, efficient, safe, storable, transportable, etc. It has been generally regarded as the most ideal pollution-free green energy in the new century, so it has been highly regarded by various countries Value.

Principle of photolysis water

Photocatalytic reactions can be divided into two types of "down energy barrier" (down hil1) and "up energy barrier" (up hil1) 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. To decompose water to release hydrogen, thermodynamics requires that the conduction band potential of the semiconductor material as a photocatalytic material is slightly negative than the hydrogen electrode potential EH + / H2, and the valence band potential should be slightly positive than the oxygen electrode potential Eo2 / H2O. The principle of photolysis water is: light is radiated on the semiconductor. When the energy of the radiation is greater than or equal to the width of the forbidden band of the semiconductor, the electron in the semiconductor is excited to transition from the valence band to the conduction band, and the holes are left in the valence band. Separate electrons and holes, and then reduce water to hydrogen or oxidize water to oxygen at different locations of the semiconductor. Khan et al. Proposed that the photocatalytic decomposition of water to produce hydrogen needs to meet: high stability, no photocorrosion; low price; able to meet the thermodynamic requirements of decomposed water; able to absorb sunlight.

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