Anatase/Bronze TiO 2 Heterojunction: Enhanced Photocatalysis and Prospect in Photothermal Catalysis
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doi: 10.1007/s40242-020-0312-y
Review
Anatase/Bronze TiO2 Heterojunction: Enhanced Photocatalysis and Prospect in Photothermal Catalysis WANG Changhua and ZHANG Xintong * Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, P. R. China Abstract TiO2 heterojunction with different TiO 2 phases has been widely adopted for enhanced photocatalysis. Therein, a less common anatase/bronze TiO 2 heterojunction, also named as anatase/TiO 2(B) heterojunction, has recently drawn increasing interest. In this review, the structural advantages of anatase/bronze TiO2 heterojunction for enhanced photocatalysis is highlighted in terms of less lattice mismatch and better charge separation at the interface. Besides photocatalysis, the anatase/bronze TiO 2 heterojunction is proven a promising candidate for heat-assisted photocatalysis, named as photothermal catalysis. Further, the anatase/bronze TiO 2 heterojunction can serve as a good model to evaluate the strategy for improved photocatalysis and even photothermal catalysis. Herein, the recent attempts on boosting the photocatalytic and photothermal catalytic performance of anatase/bronze TiO 2 heterojunction are summarized. It is expected that this review would arouse renewed interest for revisiting TiO 2 heterojunction in photocatalysis, photothermal catalysis and other advanced photocatalysis. Keywords Anatase; Bronze; Photocatalysis; Photothermal catalysis
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Introduction
Since the discovery of TiO2 photocatalysis, its rapid research and development has made us difficult to distinguish whether TiO2 makes photocatalysis popular or photocatalysis makes TiO2 popular[1―4]. TiO2 has long been hot spot in the research progress of photocatalysis and an ideal model to verify the various concepts of photocatalysis theory. Up until now, TiO2 is reported to mainly exist in three distinct phases, anatase, rutile, and brookite and one less common phase, bronze[5]. Additionally, mixed phases of TiO2 are considered equal importance to single phase TiO2, because heterojunction with two or three TiO2 phases is widely reported to promote the charge separation and hence exhibit enhanced photocatalytic activity[6―8]. Among TiO2 heterojunctions, anatase/rutile has been studied for many years, which is inspired by commercial benchmark-P25. Besides, recent studies on bronze TiO2 demonstrates that its more metastable feature could induce bronzed based TiO2 heterojunctions[9―11]. Moreover, the layered structure of bronze TiO2 is particularly favorable for structural modification, such as doping and introduction of defects, which provides more choices for improved photocatalysis[12,13]. Combining the general advantages of TiO2 heterojunction and the unique structure of bronze TiO2, increasing attention is paid to the anatase/bronze heterojunction for enhanced photocatalysis. Up until now, photocatalysis has been applied in various
fields, including photoinduced self-cleaning, production of solar fuels via water splitting or CO
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