首页|Facile construction of BiOI/Nb_2O_5 heterojunction films and their excellent photocatalytic activity

Facile construction of BiOI/Nb_2O_5 heterojunction films and their excellent photocatalytic activity

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  • Springer Nature
A conventional hydrothermal method followed by a facile immersion method is used to prepare BiOI/Nb_2O_5 heterojunction films on the wire mesh made of stainless steel. The results show that sea urchin-like Nb_2O_5 nanospheres of orthorhom-bic structure and hierarchical flower-like BiOI with a tetragonal crystal type were formed in the preparation. BiOI and Nb_2O_5 combined firmly at the micron and nanoscale. They have formed heterojunctions. The optical measurements show that the heterojunction formation markedly extended the visible light absorption wavelength range even to 600 nm. The optical band gap values of the BiOI/ Nb_2O_5 heterojunction films were decreased from 3.05 to ～ 1.63 eV. PL spectra revealed the heterojunction formation significantly inhibited the recombination of photogenerated electron-hole pairs. The electrochemical testing suggests that the photocurrent density of the BiOI/Nb_2O_5 heterojunction films is nine times that of the individual Nb_2O_5 film at most. It means that the heterojunction observably improved the separation efficiency of photogenerated charges. Based on the above strategy, the photocatalytic activity in degrading RhB dye in an aqueous solution was enhanced by 6.2 times at most. When the immersion number was 12, the heterojunction film exhibited the most excellent photocatalytic activity. A possible mechanism of photocatalytic performance improvement was also discussed.

Rong Jia、Liang Hao、Te Hu、Yiqiang He、Jiankang Wang、Yun Lu

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Tianjin Key Lab of Integrated Design and On-Line Monitoring for Light Industry & Food Machinery and Equipment, Tianjin 300222, People's Republic of China||College of Mechanical Engineering, Tianjin University of Science & Technology, No. 1038, Dagu Nanlu, Hexi District, Tianjin 300222, People's Republic of China||Tianjin International Joint Research and Development Center of Low-Carbon Green Process Equipment, Tianjin 300222, People's Republic of China

College of Materials Science and Hydrogen Energy Engineering, Foshan University, No. 18, Jiangwanyilu, Foshan 528000, Guangdong, People's Republic of China

School of Mechanical Engineering, Jiangsu Ocean University No. 59, Cangwulu, Haizhou District, Lianyungang 222005, People's Republic of China

Graduate School of Science and Engineering, Chiba University, No. 1-33, Yayoi-Cho, Inage-Ku, Chiba 263-8522, Japan

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2023

10.1007/s10854-023-11700-3

Journal of materials science. Materials in electronics

Journal of materials science. Materials in electronics

ISSN：0957-4522
年,卷(期)：2023.34(36)
  • 32