کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7938896 | 1513184 | 2018 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhanced photocatalytic performance from NiS/TiO2 p-n heterojunction nanosheet arrays
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A novel p-n heterostructural film photocatalyst of oriented NiS/TiO2 nanosheet arrays were designed and successfully fabricated via a simple two-step hydrothermal process, and its photodegradation activities of methyl orange (MO) were detailedly investigated. Combining p-type NiS nanoparticles with n-type TiO2 nanosheets to construct distributed p-n heterojunctions, the absorption edge of NiS/TiO2 red-shifted to about 471â¯nm and its photoresponse in visible range significantly enhanced. Compared with pure TiO2 nanosheet arrays (NSAs), the assembled NiS/TiO2 p-n heterostructural arrays with 0.003â¯M NiS in hydrothermal precursor solution showed an optimal degradation rate of kâ¯=â¯0.7368 hâ1 for MO, achieving 76.3% photocatalytic efficiency within 120â¯min, which is about 2.34 times higher than that of pure TiO2 nanosheet arrays (kâ¯=â¯0.3144 hâ1). Such enhanced photocatalytic activities should be attributed to both the high efficiency of photogenerated charge separation by the built-in electric field at interfaces of NiS-TiO2 and the oriented thin nanosheet structures for smoothly charge transportation for redox reactions at surfaces of NiS/TiO2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Superlattices and Microstructures - Volume 117, May 2018, Pages 317-329
Journal: Superlattices and Microstructures - Volume 117, May 2018, Pages 317-329
نویسندگان
Long-Long Qian, Yan Li, Jian-feng Li, Cheng-Wei Wang,