Enhanced photoactivity and oxidizing ability simultaneously via internal electric field and valence band position by crystal structure of bismuth oxyiodide
By Y. Guo, W. Shi, Yongfa Zhu, Yongpeng Xu, F. Cui. 2020
170 citations recorded by the source corpus.
Abstract Herein, the photoactivity and oxidizing ability of bismuth oxyiodide were enhanced simultaneously via crystal structure regulation. The internal electric field is enhanced via unit cell dipole with various crystal structures. The reduction of I in bismuth oxyiodide crystal increased dipole and crystal internal electric field, as a result promoting the photogenerated charge separation. This is also the intrinsic reason for the different photoactivity of bismuth oxyiodide with various crystal structures (BiOI, Bi4O5I2 and Bi5O7I). Irradiated below 420 nm, the photocatalytic activity of Bi5O7I is 4.65 times and 6.59 times greater than that of Bi4O5I2 and BiOI, respectively. Meanwhile, since the decreasing of valence band position for bismuth oxyiodide with the reduction of I, the oxidizing ability remarkably increase, resulting the mineralization ability significantly strengthened. The crystal structure regulation is a promising candidate for enhancing both photoactivity and oxidizing ability of photocatalysts simultaneously.
Subfields: Electrical and Electronic Engineering, Materials Chemistry, Renewable Energy, Sustainability and the Environment
View Paper: https://www.semanticscholar.org/paper/9fb016500ddb121f7e0b3b7d7aafdda89d107868
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In Electrical and Electronic Engineering
In Materials Chemistry
In Renewable Energy, Sustainability and the Environment
Citations in the corpus
- Internal electric field engineering for steering photogenerated charge separation and enhancing photoactivity (2019, methodology): “The purple, gray and red shaded parts represent the local electric fields of [-Bi-I-], [-I-I-] and [-Bi-O-], respectively; 2019, Elsevier.(47) C, Chemical structure of CAs and dipole strengths calculated from density functional theory simulation.”