Zhang Jian, Xin Jiayu, Shao Changlu, Li Xinghua, Li Xiaowei, Liu Shuai, Liu Yichun
Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory of UV-Emitting Materials and Technology (Northeast Normal University), Ministry of Education, 5268 Renmin Street, Changchun 130024, People's Republic of China.
Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory of UV-Emitting Materials and Technology (Northeast Normal University), Ministry of Education, 5268 Renmin Street, Changchun 130024, People's Republic of China.
J Colloid Interface Sci. 2019 Aug 15;550:170-179. doi: 10.1016/j.jcis.2019.04.099. Epub 2019 May 2.
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-CuAlO/n-BiWO composite 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 CuAlO and BiWO. Furthermore, the composite nanofibers exhibit well separable properties by natural sedimentation because of its ultra-long and non-woven web nanostructure. The paper explores CuAlO and its Z-scheme heterostructures in water splitting for the first time, which may highlight its new applications.
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，传统II型异质结中电荷载流子的空间分离是以牺牲其氧化还原能力为代价的。本文通过静电纺丝技术和溶剂热反应构建了具有均匀非织造网状纳米结构的p-CuAlO/n-BiWO复合纳米纤维的精心设计的直接Z型体系（ZSS）。详细研究了ZSS的形成机理和电荷迁移途径。结果表明，所制备的复合纳米纤维由于其较强的氧化还原能力和有效的电荷分离，对整体水分解表现出理想的光催化性能。同时，它对各种有机污染物模型（RhB、MO、4-NP）的光降解表现出很高的活性，比单组分CuAlO和BiWO高1个数量级。此外，复合纳米纤维由于其超长的非织造网状纳米结构，通过自然沉降表现出良好的可分离性能。本文首次探索了CuAlO及其Z型异质结构在水分解中的应用，这可能突出其新的应用。
