Photoelectrocatalytic Mechanism of BiVO4 Photoanode Materials with Porous Structure and Powder Structure
Photoelectrocatalytic decomposition of water to produce hydrogen can convert solar energy into chemical energy, and is an important way to obtain clean energy. How to develop semiconductor photoanode materials with high efficiency solar photoelectrocatalytic properties is a key issue for solar energy application. Nanoporous semiconductor materials have attracted much attention due to their high specific surface area, good light absorption and other excellent properties. However, the light absorption and photoelectrocatalytic mechanism of nanoporous materials needs further study.
Institute of Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences researcher Bi Yingpu led the energy and environmental nanocatalysis materials group in the semiconductor nanoporous structure of photoanode material research progress.
The research group was based on the previous research on the controllable construction of semiconducting nanomaterials and their photoelectrocatalytic properties (J. Mater. Chem. A, 2015, 3, 19702; Chem Commun, 2015, 51, 2103; ACS Appl. Mater. Inter, 2014, 6, 19488; Chem Eur J, 2013, 19, 9472, etc.) A nanoporous structure BiVO4 photoanode material with a controlled pore size ranging from 200 to 700 nm was grown on a FTO substrate by coating roasting. The photoelectrocatalytic decomposition of water into hydrogen was studied. The results show that the pore-electron photocatalytic performance of porous structure BiVO4 is best when the pore size is 400 nm. The optical properties and photo-carrier migration have been studied. The results show that the material exhibits excellent porous optical diffraction and interference when the pore size is 400 nm, which is beneficial to the visible light transmission in the porous structure BiVO4 photoanode, thereby increasing the visible light absorption efficiency. . In addition, the nanoporous structure of the anode material facilitates the rapid separation of photogenerated charge, and photogenerated holes that migrate to the surface easily undergo oxidation reaction with H2O. The results of this study confirm that proper regulation of semiconductor pore size can be used as an effective method to improve photoelectrocatalytic water splitting performance of semiconductors. The relevant research results were published on the Nanoscale (Nanoscale, 2015, 7, 20374).
The above work was funded by the National Natural Science Foundation of China and the "Hundred Talents Program" of the Chinese Academy of Sciences.
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