Journal
NANO-MICRO LETTERS
Volume 9, Issue 2, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-016-0118-0
Keywords
Bi nanoparticles; Bi-Bi2O2CO3 nanosheets; Heterojunction; Hydrothermal method; Charge separation; Visible light photocatalytic activity
Funding
- Council of Scientific and Industrial Research (CSIR, India)
- DST, INSPIRE
- DST, India [SB/S1/PC-011/2013]
- DAE (India) [2013/37P/73/BRNS]
- NTH-School
- Braunschweig International Graduate School of Metrology (IGSM)
- Metrology for Complex Nanosystems [DFG-RTG1952/1]
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Bismuth containing nanomaterials recently received increasing attention with respect to environmental applications because of their low cost, high stability and nontoxicity. In this work, Bi-Bi2O2CO3 heterojunctions were fabricated by in-situ decoration of Bi nanoparticles on Bi-Bi2O2CO3 nanosheets via a simple hydrothermal synthesis approach. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) were used to confirm the morphology of the nanosheet-like heterostructure of the Bi-Bi2O2CO3 composite. Detailed ultrafast electronic spectroscopy reveals that the in-situ decoration of Bi nanoparticles on Bi-Bi2O2CO3 nanosheets exhibit a dramatically enhanced electron-hole pair separation rate, which results in an extraordinarily high photocatalytic activity for the degradation of a model organic dye, methylene blue (MB) under visible light illumination. Cycling experiments revealed a good photochemical stability of the Bi-Bi2O2CO3 heterojunction under repeated irradiation. Photocurrent measurements further indicated that the heterojunction incredibly enhanced the charge generation and suppressed the charge recombination of photogenerated electron-hole pairs.
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