TiO2 ALD decorated CuO/BiVO4 p-n heterojunction for improved photoelectrochemical water splitting
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第8期
论文作者：Linxing Meng Wei Tian Fangli Wu Fengren Cao Liang Li
文章页码：1740 - 1746
摘 要：Bismuth vanadate（BiVO4）is a promising photoanode material owing to the narrow bandgap,appropriate band position,and excellent resistance against photocorrosion,however,the performance of photoelectrochemical（PEC）water splitting is largely limited by the poor carrier separation and transport ability.To address these issues,for the first time,we fabricate BiVO4 film/CuO nanocone p-n junctions as photoanodes by combing a facile spin-coating process and water bath reaction.This structure strengthens the light harvesting and promotes the charge separation and transport ability.The surface defects states are passivated by coating conformally ultrathin TiO2 onto CuO surface through atomic layer deposition（ALD）technique.Benefiting from the favorable morphology,energy band,and surface treatment,the BiVO4/CuO/TiO2 heterojunction generates an improved photocurrent that is much higher than pure BiVO4.The detailed mechanism investigations indicate that the synergetic optimization of charge separation and injection efficiency in the bulk and surface of photoelectrodes can significantly improve the performance of PEC cells.
Linxing Meng，Wei Tian，Fangli Wu，Fengren Cao，Liang Li
School of Physical Science and Technology,Center for Energy Conversion Materials & Physics (CECMP),Jiangsu Key Laboratory of Thin Films,Soochow University
摘 要：Bismuth vanadate（BiVO4）is a promising photoanode material owing to the narrow bandgap,appropriate band position,and excellent resistance against photocorrosion,however,the performance of photoelectrochemical（PEC）water splitting is largely limited by the poor carrier separation and transport ability.To address these issues,for the first time,we fabricate BiVO4 film/CuO nanocone p-n junctions as photoanodes by combing a facile spin-coating process and water bath reaction.This structure strengthens the light harvesting and promotes the charge separation and transport ability.The surface defects states are passivated by coating conformally ultrathin TiO2 onto CuO surface through atomic layer deposition（ALD）technique.Benefiting from the favorable morphology,energy band,and surface treatment,the BiVO4/CuO/TiO2 heterojunction generates an improved photocurrent that is much higher than pure BiVO4.The detailed mechanism investigations indicate that the synergetic optimization of charge separation and injection efficiency in the bulk and surface of photoelectrodes can significantly improve the performance of PEC cells.
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