Fabrication Of Metalloporphyrins Modified TiO₂ Electrodes And Their Application In CO₂ Photoelectric Reduction

Along with the increasing global energy consumption and the serious environmental problems,people have to seek and develop clean renewable energy that can promote the sustainable development of the whole society.Compared with the traditional fossil energy,solar energy is a clean,inexhaustible and renewable energy.Photosynthesis in the plant community is the most representative way of converting solar energy.So in the carbon dioxide cycle of the earth,it will be a powerful solution to the crisis of resources and environment if we can introduce solar energy to transform carbon dioxide to fuels.This topic imitates the natural plants,constructing an effective chemical environment using porphyrin molecules to realize the conversion of carbon dioxide to energy materials.First,we explored the new modification method of semiconductors.We coated the porphyrin molecules on the surface of TiO₂ semiconductor through covalent bond.Through the surface chemistry environment of polyamine,the adsorption and transformation of carbon dioxide can be effectively improved.In order to avoid the use of the sacrificial reagents,we chose the modified bismuth vanadate as an anode,at the same time the oxidation of water and the reduction of carbon dioxide can be achieved.This kind of artificial photosynthesis cell can efficiently realize the conversion of carbon dioxide to methanol.Next,in order to further improve the stability of the catalyst and synthesize more complex and useful chemicals,we have designed and synthesized a new metal organic framework composed of two different porphyrin components.In this material of photocathode,we introduce different catalytic active centers to build complex chemical environment,and achieve the synthesis of advanced hydrocarbons through intermolecular synergies.