Large-scale synthesis of 2D bismuth-enriched bismuth oxyiodides at low temperatures for high-performance supercapacitor and photocatalytic applications

• Published in: Journal of materials science. Materials in electronics Vol. 31; no. 7; pp. 5385 - 5401
• Main Authors: Wu, Pei, Feng, Li, Liang, Yicong, Zhang, Xia, Li, Xuhao, Tian, Shenghai, Hu, Hai, Yin, Gaohong, Khan, Sarfaraz
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.04.2020; Springer Nature B.V
• Subjects: Bismuth; Capacitance; Catalytic activity; Characterization and Evaluation of Materials; Chemical composition; Chemistry and Materials Science; Chlorophenol; Construction materials; Electrochemical analysis; Enrichment; Low temperature; Materials Science; Morphology; Optical and Electronic Materials; Oxyhalides; Photocatalysis; Photocatalysts; Properties (attributes); Rhodamine; Supercapacitors; Surface properties
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-020-03099-y

Various bismuth oxyhalides materials (such as BiOX, where X = Cl, Br, F, I) are widely investigated in supercapacitors and photocatalyst fields owing to their unique morphological features and outstanding electrochemical properties. In this study, we have synthesized various bismuth-rich oxyiodides such as BiOI, Bi 4 O 5 I 2 , Bi 5 O 7 I, and Bi 7 O 9 I 3 with two-dimensional morphologies in large scale by facile hydrothermal route. The chemical composition, surface properties, morphological features, and electrochemical properties have been systematically investigated using various advanced characterization techniques. The XRD results confirmed that the BiOI, Bi 4 O 5 I 2 , Bi 5 O 7 I, and Bi 7 O 9 I 3 could be prepared by adjusting simply the pH values and OH − concentrations. Furthermore, the enrichment in the Bi content, the surface area, specific capacitance, and photocatalytic activity of the materials has been increased appreciably. A high specific capacitance value of 347 F g −1 is achieved for the Bi 7 O 9 I 3 material, which is higher than the other bismuth-enriched oxyiodide such as BiOI, Bi 4 O 5 I 2 , and Bi 5 O 7 I, respectively. Moreover, compared with other bismuth oxyiodides, the Bi 7 O 9 I 3 exhibited admirable photocatalytic activity toward the rhodamine B dye and 4-chlorophenol degradation under the visible light. In addition, this comprehensive study provides a new strategy in the development of highly efficient bismuth oxyhalides for constructing high-performance photocatalyst material and supercapacitor electrode for energy and environmental applications.