Yaru Li,Xiaochao Zhang,Jianxin Liu,Yawen Wang,Yunfang Wang,Rui Li,Caimei Fan
A fish bone-like BiVO 4 film was successfully prepared in-situ on metal Bi substrate via a facile one-step hydrothermal method. The obtained BiVO 4 film exhibits excellent tetracycline photodegradation efficiency, reaching 89.7% in 240 min under visible light irradiation. Its quantum yield (6.3 × 10 −5 molecules photon −1 ) and kinetic reaction rate (7.80 μmol g −1 h −1 ) are better than most reported immobilized Bi-based systems. Finally, the formation mechanism was investigated, which suggests that OH − plays a vital role in forming BiVO 4 film by affecting the release of VO 3 − . The results of this study provide available means in the in-situ preparation of Bi-based photocatalyst film.
Lei Shi,Wenyue Zhao,Zhao Wang,Wenjing Hua,Xiaoxia Yang,Xinyu Cao,Weidong Fei,Yu Zhao
The novel photovoltaic effect mechanism has been consistently corroborated over the last decade, however, the low photocurrent density remains a significant impediment to its practical applications. In this study, an extra-large photocurrent density is achieved in the acceptor (A 2+ , A = Ca, Sr, Ba)-donor (W 6+ ) co-doped BiVO 4 (BVO) films prepared with a sol-gel method. A photocurrent density of 4.05 mA/cm 2 under 450 nm light illumination and a large detection rate of 8.4 × 10 11 Jones and 5.4 × 10 11 Jones for 365 nm and 450 nm are respectively obtained. The high photoelectric conversion efficiency (PCE) of 2.4 % is obtained in the Au/BVO/Pt sandwich structure under 365 nm (10 mW/cm 2 ) light illumination using Sr 2+ -W 6+ co-doped film, even if the light is obstructed by Au top electrode. A possible mechanism based on uneven composition formed by acceptor-donor ions is proposed to explain the enhancement of the photovoltaic effect in A 2+ -W 6+ co-doped BVO films. The composite ion doping engineering presents a novel strategy for improving the photoelectric conversion efficiency in single-layer films.
Jiangshan Li,Yuxiao Chu,Chuanqun Zhang,Xiao Zhang,Chenqi Wu,Xianqiang Xiong,Lujia Zhou,Chenglin Wu,Deman Han
The development of efficient photocathodic protection system requires highly active and robust light-absorbing electrodes for promoting the electron transfer from the light-absorber to the protected metal. Herein, we present an extremely active and stable CoFe prussian blue (CoFe-PB) modified BiVO 4 film prepared by sequentially dipping the BiVO 4 film in K 3 [Fe(CN) 6 ] and CoCl 2 solution, which can realize the long-term protection of 304 stainless steel under simulated solar illumination. Particularly, the photocathodic protection process can be operated in a scavenger-free environment. Our mechanism studies reveal that the CoFe-PB overlayer acts as the hole storage layer which can effective extract the photo-generated holes from the BiVO 4 photoanode, and meanwhile works as an efficient catalyst that overcome the slow water oxidation barrier at the electrode/liquid interface, and thus greatly increase the electron lifetime, thereby enhancing the photocathodic protection capability. Our work provides a rather simple and effective design strategy for constructing semiconductor/electrocatalysts system for the underlying photogenerated cathodic protection application.
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