Monodisperse spherical sandwiched core-shell structured SiO2-Au-Ta2O5 and SiO2-Au-Ta3N5 composites as visible-light plasmonic photocatalysts
Monodisperse spherical sandwiched core-shell structured SiO2-Au-Ta2O5 and SiO2-Au-Ta3N5 composites as visible-light plasmonic photocatalysts
复制标题
单分散球形夹心核壳结构SiO2-Au-Ta2O5和SiO2-Au-Ta3N5复合材料作为可见光等离子体光催化剂
DOI：
10.1016/j.ijhydene.2018.09.052
复制
发表时间：
2018
影响因子：
7.2
通讯作者：
Al Kheraif Abdulaziz A.
中科院分区：
文献类型：
--
作者：
Liu Xiaoming;Feng Jingchun;Wu Binquan;Li Yizu;Xie Weijie;Lin Jun;Zheng Xia;Luo Xubiao;Al Kheraif Abdulaziz A.
采用原位还原结合溶胶-凝胶法，在非团聚、球形、单分散的SiO2微球上沉积Au纳米粒子和Ta 2 O 5纳米微粒，制备了一种夹心式核壳结构的SiO2单键-Ta 2 O 5复合等离子体光催化剂。将所制备的SiO2单键-Ausingle键-Ta 2 O 5复合等离子体光催化剂在氨水中于适当温度下氮化，得到SiO2单键-Ausingle键-Ta 3 N5复合等离子体光催化剂。利用Au纳米粒子的表面等离子体共振效应，所制备的SiO2单键-Ausingle bondTa 2 O 5复合等离子体光催化剂表现出了新的可见光响应的水制氢光催化活性，所制备的SiO2单键-Ausingle bondTa 3 N5复合等离子体光催化剂的可见光响应的水制氢光催化活性高于空白Ta 3 N5纳米晶。此外，SiO_2单键-Ausingle键-Ta_2O_5和SiO_2单键-Ausingle键-Ta_3N_5复合材料的优异形貌，夹心核壳结构、单分散性、球形等显著提高了其在溶液中的分散性、光捕获能力、电荷分离和传输能力，从而提高了其光催化活性。该研究为设计高效的等离子体光催化剂提供了一个很好的范例。
Au nanoparticles and fine Ta2O5nanocrystallines were deposited on nonaggregated, spherical, monodisperse SiO2micorspheres to form a kind of sandwiched core-shell structured SiO2single bondAusingle bondTa2O5composite plasmonic photocatalyst by anin-situreduction process integrated with a sol-gel process. The prepared SiO2single bondAusingle bondTa2O5composite plasmonic photocatalyst was nitrided in ammonia flow at an appropriate temperature to obtain SiO2single bondAusingle bondTa3N5composite plasmonic photocatalyst. Benefitting from Au nanoparticles' surface plasmon resonance effect, the obtained SiO2single bondAusingle bondTa2O5composite plasmonic photocatalyst presents a novel photochemical activity of H2production from H2O with visible light response, and the prepared SiO2single bondAusingle bondTa3N5composite plasmonic photocatalyst exhibits a higher photochemical activity of H2production from H2O with visible light response than that of blank Ta3N5nanocrystalline. Furthermore, the excellent morphologies of SiO2single bondAusingle bondTa2O5and SiO2single bondAusingle bondTa3N5composites, e.g., sandwiched core-shell structure, monodisperse, and spherical, drastically improve their dispersion in solution, light harvesting, charge separation and transportation, which might do some contributions to improve their photocatalytic activities accordingly. This investigation might set a good example for designing highly efficient plasmonic photocatalysts for photochemical solar H2production with visible light response.