Direct Z-scheme heterostructure of p-CuAl2O4/n-Bi2WO6 composite nanofibers for efficient overall water splitting and photodegradation
Direct Z-scheme heterostructure of p-CuAl2O4/n-Bi2WO6 composite nanofibers for efficient overall water splitting and photodegradation
复制标题
p-CuAl2O4/n-Bi2WO6 复合纳米纤维的直接 Z 型异质结构可实现高效的整体水分解和光降解
DOI：
10.1016/j.jcis.2019.04.099
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发表时间：
2019
影响因子：
9.9
通讯作者：
Liu Yichun
中科院分区：
文献类型：
--
作者：
Zhang Jian;Xin Jiayu;Shao Changlu;Li Xinghua;Li Xiaowei;Liu Shuai;Liu Yichun
构建异质结构可以促进光生电荷分离，从而提高光催化性能。然而，在传统的II型异质结中，电荷载流子的空间分离是以牺牲它们的氧化还原能力为代价的。本文采用静电纺丝技术和溶剂热反应制备了具有均匀非织造网状结构的p-CuAl_2 O_4/n-Bi_2 WO_6复合纳米纤维。详细研究了ZSS的形成机理和电荷迁移途径。结果表明，由于其较强的氧化还原能力和有效的电荷分离，所制备的复合纳米纤维表现出良好的光催化分解水的整体性能。同时，它对各种有机污染物模型（RhB，MO，4-NP）的光催化降解活性也很高，比单组分CuAl 2 O 4和Bi 2 WO 6高1个数量级。此外，由于其超长的非织造网纳米结构，复合纳米纤维通过自然沉降表现出良好的分离性能。本文首次探讨了CuAl_2O_4及其Z型异质结构在水裂解中的应用，为CuAl_2O_4的应用开辟了新的前景。
Constructing heterostructures can facilitate photoinduced charge separation, leading to enhanced photocatalytic performance. However, spatial separation of charge carriers in traditional type II heterojunctions is at the expense of their redox ability. In this paper, well-designed direct Z-scheme systems (ZSS) of p-CuAl2O4/n-Bi2WO6composite nanofibers with uniform non-woven web nanostructure was built by electrospinning technique and solvothermal reactions. The formation mechanism of the ZSS and the charge migration pathway is investigated in detail. Results show that as-prepared composite nanofibers exhibit desirable photocatalytic performance for overall water splitting due to its stronger redox power and efficient charge separation. Meantime, it shows great activity for photodegradation of various organic pollutant models (RhB, MO, 4-NP), which is 1 order of magnitude higher than the single-component CuAl2O4and Bi2WO6. Furthermore, the composite nanofibers exhibit well separable properties by natural sedimentation because of its ultra-long and non-woven web nanostructure. The paper explores CuAl2O4and its Z-scheme heterostructures in water splitting for the first time, which may highlight its new applications.