According to foreign website reports, an international research team has now successfully increased the efficiency of direct solar energy decomposition of water to hydrogen to 19%, setting a new world record. They achieved this record by connecting solar cells made from rhodium nanoparticles and a crystalline titanium dioxide catalyst coating in series. Research teams from the California Institute of Technology, Cambridge University, Ilmenau University of Technology and Fraunhofer Institute of Solar Energy participated in the development work. Some experiments were carried out at the Solar Fuel Institute in Helmholtz-Zentrum, Berlin.
Researchers have found that using a solar cell combined with a catalyst and an additional functional layer to form a "monolithic photoelectrode" can carry out a hydrolysis reaction: immersing the photocathode in an aqueous medium, when the light falls on it, hydrogen will be generated on the front and back Oxygen is produced.
Transparent anti-corrosion layer
The focus of this research is also a monolithic photocathode. The research team combined the extra functional layer with a highly efficient series battery made of III-V semiconductors, which can significantly reduce the surface reflectivity of the battery, thereby avoiding the light absorption and reflection. Energy loss. The research team has achieved an efficiency of more than 14% in 2015. Today, the crystalline titanium dioxide layer is used to replace the anticorrosive top layer. Not only does it have excellent anti-reflection properties, but it can directly attach the catalyst particles to its surface. In addition, the researchers also used a new electrochemical method to produce rhodium nanoparticle catalysts, used to catalyze the water decomposition reaction, the diameter of the particles is only 10 nanometers, optically almost transparent, so it is very suitable for photolysis water reaction .
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