As BiVO4 is one of the most popular visible-light-responding photocatalysts, it has been widely used for visiblelight-driven water splitting and environmental purification. However, the typical photocatalytic activity...As BiVO4 is one of the most popular visible-light-responding photocatalysts, it has been widely used for visiblelight-driven water splitting and environmental purification. However, the typical photocatalytic activity of unmodified BiVO4 for the degradation of organic pollutants is still not impressive. To address this limitation, we studied Fe2O3-modified porous BiVO4 nanoplates. Compared with unmodified BiVO4, the Fe2O3-modified porous Bi VO4 nanoplates showed significantly enhanced photocatalytic activities in decomposing both dye and colorless pollutant models, such as rhodamine B(Rh B) and phenol,respectively. The pseudo-first-order reaction rate constants for the degradation of RhB and phenol on Fe2O3-modified BiVO4 porous nanoplates are 27 and 31 times larger than that of pristine Bi VO4, respectively. We also found that the Fe2O3 may act as an efficient non-precious metal co-catalyst, which is responsible for the excellent photocatalytic activity of Fe2O3/BiVO4.Graphical Abstract Fe2O3, as a cheap and efficient co-catalyst, could greatly enhance the photocatalytic activity of Bi VO4 porous nanoplates in decomposing organic pollutants.展开更多
Co-Pi and FeOOH cocatalysts were in-situ deposited on the surface of nanoporous BiVO4 photoelectrodes.The FeOOH cocatalyst has little effect on the BiVO4 samples＇ morphologies,while the electrodeposited CoPi cocataly...Co-Pi and FeOOH cocatalysts were in-situ deposited on the surface of nanoporous BiVO4 photoelectrodes.The FeOOH cocatalyst has little effect on the BiVO4 samples＇ morphologies,while the electrodeposited CoPi cocatalyst seems to affect the surface of BiVO4 The impedance intensity modulated photocurrent spectroscopy（IMPS）,Mott-Schottky（M-S） techniques characterize BiVO4 samples photoelectrochemical performance with the deposition of Co-Pi and FeOOH.The Co-Pi/BiVO4 shows better photoelectrochemical performance than the FeOOH/BiVO4,but the FeOOH/BiVO4 exhibited the better stabilities.The flat band potential and slope of M-S plotof FeOOH/BiVO4 have little variations compared with BiVO4.In contrast,Co-Pi/BiVO4 exhibited the down shifted flat band potential,which is beneficial for the photoelectrochemical water oxidation.The electron transfer measurements revealed that the deposition of FeOOH and Co-Pi onto BiVO4 significantly enhanced the photoelectrochemical performance via reducing the interface resistance and promoting the electron transport.Furthermore,Co-Pi cocatalysts can further pin the transport-limiting traps and significantly facilitate the electron transport.展开更多
基金partial financial support from NSFC(51372173,51002107,and21173159)NSFC for Distinguished Young Scholars(51025207)+3 种基金Research Climb Plan of ZJED(pd2013383)Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure(SKL201409SIC)Xinmiao talent project of Zhejiang Province(2013R424060)College Students Research Project of Wenzhou University(14xk193)
文摘As BiVO4 is one of the most popular visible-light-responding photocatalysts, it has been widely used for visiblelight-driven water splitting and environmental purification. However, the typical photocatalytic activity of unmodified BiVO4 for the degradation of organic pollutants is still not impressive. To address this limitation, we studied Fe2O3-modified porous BiVO4 nanoplates. Compared with unmodified BiVO4, the Fe2O3-modified porous Bi VO4 nanoplates showed significantly enhanced photocatalytic activities in decomposing both dye and colorless pollutant models, such as rhodamine B(Rh B) and phenol,respectively. The pseudo-first-order reaction rate constants for the degradation of RhB and phenol on Fe2O3-modified BiVO4 porous nanoplates are 27 and 31 times larger than that of pristine Bi VO4, respectively. We also found that the Fe2O3 may act as an efficient non-precious metal co-catalyst, which is responsible for the excellent photocatalytic activity of Fe2O3/BiVO4.Graphical Abstract Fe2O3, as a cheap and efficient co-catalyst, could greatly enhance the photocatalytic activity of Bi VO4 porous nanoplates in decomposing organic pollutants.
基金Project supported by the National Natural Science Foundation of China(Nos.51372151,21303103)
文摘Co-Pi and FeOOH cocatalysts were in-situ deposited on the surface of nanoporous BiVO4 photoelectrodes.The FeOOH cocatalyst has little effect on the BiVO4 samples＇ morphologies,while the electrodeposited CoPi cocatalyst seems to affect the surface of BiVO4 The impedance intensity modulated photocurrent spectroscopy（IMPS）,Mott-Schottky（M-S） techniques characterize BiVO4 samples photoelectrochemical performance with the deposition of Co-Pi and FeOOH.The Co-Pi/BiVO4 shows better photoelectrochemical performance than the FeOOH/BiVO4,but the FeOOH/BiVO4 exhibited the better stabilities.The flat band potential and slope of M-S plotof FeOOH/BiVO4 have little variations compared with BiVO4.In contrast,Co-Pi/BiVO4 exhibited the down shifted flat band potential,which is beneficial for the photoelectrochemical water oxidation.The electron transfer measurements revealed that the deposition of FeOOH and Co-Pi onto BiVO4 significantly enhanced the photoelectrochemical performance via reducing the interface resistance and promoting the electron transport.Furthermore,Co-Pi cocatalysts can further pin the transport-limiting traps and significantly facilitate the electron transport.
