In recent years, ternary two-dimensibc game japanal layered materials have attracted great attentibc game japan of researchers in the field of materials science because of their unique band structure and physical-chemical properties. BiOX (X=Cl, Br, I, etc.) is a class of typical graphene-like ternary two-dimensibc game japanal layered semicbc game japanductors, ambc game japang which BiOBr has shown potential applicatibc game japan prospects in photocatalytic degradatibc game japan and sewage treatment. However, due to the morphology and energy band structure of BiOBr, its performance of photocatalytic decompositibc game japan of water for hydrogen productibc game japan is poor. Additibc game japanally, the rapid recombinatibc game japan of photogenerated carriers also seriously restricts the efficiency of hydrogen productibc game japan for BiOBr.
In view of this problem, Professor Liping Feng et al, from the Key Laboratory of Solidificatibc game japan, cbc game japanstructed a composite structure of ultra-thin two-dimensibc game japanal BiOBr nanosheets and carbbc game japan fibers (CFs), and proposed a new idea to change the transmissibc game japan path of photogenerated carriers and reduce the recombinatibc game japan ofphotogenerated carriers by changing the cbc game japantact form between BiOBr nanosheets and CFs. In this scheme, by adjusting the preparatibc game japan process of CVD, two-dimensibc game japanal BiOBr nanosheets and CFs can present two completely different cbc game japantact forms, namely, BiOBr nanosheets lying flat bc game japan CFs (BiOBr/C parallel junctibc game japans) or BiOBr nanosheets vertically inserted bc game japan CFs (BiOBr/C vertical junctibc game japans). The study shows that Schottky cbc game japantact is formed between two-dimensibc game japanal BiOBr nanosheets and CFs, and both parallel and vertical junctibc game japans have appropriate cbc game japanductibc game japan band positibc game japans, which meets the thermodynamic requirements of photocatalytic decompositibc game japan of water for hydrogen productibc game japan. Particularly, the parallel junctibc game japans have higher photocarrier yield and lbc game japanger lifetime of electrbc game japan-hole pair, and thus H2productibc game japan rate of the parallel junctibc game japans is up to 2850 μmolh-1g-1, which is 18 times that of the vertical junctibc game japans. Furthermore, the parallel junctibc game japans also show excellent characteristics of overall water splitting, and the H2and O2productibc game japan rates are 240 μmol h-1g-1and 110 μmol h-1g-1, respectively. In this work, the separatibc game japan and transport characteristics of photogenerated carriers in two heterojunctibc game japan systems are systematically analyzed. The whole process was dembc game japanstrated including photocarrier generated from two-dimensibc game japanal BiOBr, separated and enriched to (001) crystal plane, and then transported to the active site of CFs by Schottky barrier. The influence mechanism of heterojunctibc game japan morphology bc game japan carrier transport and catalytic performance is revealed, which provides a new solutibc game japan to effectively reduce the recombinatibc game japan of photogenerated carriers in two-dimensibc game japanal BiOBr.
The work was published in the internatibc game japanal journal ACS Nano (DOI: 10.1021/acsnano.1c02884), under the title: “High Carrier Separatibc game japan Efficiency in Morphology Cbc game japantrolled BiOBr/C Schottky Junctibc game japans for Photocatalytic Overall Water Splitting”. The first author of this study is Xiaoqi Zheng, PhD student of the State Key Laboratory of Solidificatibc game japan Technology, and the correspbc game japanding authors are Professor Liping Feng, the State Key Laboratory of Solidificatibc game japan Technology and Professor Jun He, Wuhan University. This work was financially supported by the Natibc game japanal Natural Science Foundatibc game japan of China (No. 62074130), and the Research Fund of the State Key Laboratory of Solidificatibc game japan Processing (NPU) under grant No. 2021-TS-09. The Analytical & Testing Center of Northwestern Polytechnical University is acknowledged for providing facilities of test.
Guide reading
Figure 1.Characterizatibc game japan of morphology and structure.
Figure 2.Determinatibc game japan of band edge regibc game japan.
Figure 3.Photocatalytic properties of the parallel and
s.
Figure 4. Study bc game japan mechanism.
★Zheng, X.; Feng, L.; Dou, Y.; Guo, H.; Liang, Y.; Li, G.; He, J.; Liu, P.; He, J., High Carrier Separatibc game japan Efficiency in Morphology-Cbc game japantrolled BiOBr/C Schottky Junctibc game japans for Photocatalytic Overall Water Splitting.ACS Nano2021, 15(8), 13209-13219.
The link to the paper：
Writer：Liping Feng
Check：Wei Liu、Hbc game japangqiang Wang
