JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yijie Wang,Hougang Fan,Xiaoyan Liu,Jian Cao,Huilian Liu,Xin Li,Lili Yang,Maobin Wei
Efficient electron transfer process and excellent CO 2 adsorption capacity are of great significance for improving CO 2 photoreduction efficiency. 3 D– 0 D ZnO/CsPbBr 3 S-scheme heterojunction hollow spheres were successfully prepared via a simple self-assembled process for efficient CO 2 photoreduction. Photocatalytic CO 2 reduction experiments showed that the ZnO/CsPbBr 3 had the excellent CO 2 photocatalytic conversion activity to CO, which was about 2.61 times higher than that of ZnO hollow micro-spheres and 1.9 times higher than that of pure CsPbBr 3 quantum dots (QDs). Photoelectrochemical characterization confirmed that the ZnO/CsPbBr 3 composite had good photoelectric conversion ability and carrier transfer ability, which was beneficial to the photocatalytic reaction. The suitable band gap structure and DFT calculation results showed that the formation of built-in electric field at the ZnO/CsPbBr 3 interface can greatly improve the S-scheme electron transfer ability, which can foster the CO 2 photoreduction. Besides, the introduction of 3D structure can improve the dispersion of CsPbBr 3 QDs and effectively enhance the CO 2 capture ability of the catalyst, which greatly promoted the CO 2 photoreduction reaction. The current work can present a novel S-scheme photocatalyst , which is looked forward to providing a certain perception into the advance of novel highly efficient CsPbBr 3 QDs-based photocatalysts for CO 2 resource utilization.
研究领域:
材料科学
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环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 39
·16403-16409
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IF 0
Meikang Han,Xiaowei Yin,Luo Kong,Mian Li,Wenyan Duan,Litong Zhang,Laifei Cheng
Graphene-wrapped ZnO hollow spheres were synthesized by a two-step process, which combined a hydrothermal reaction with surface modification. The experimental results show that reduced graphene oxide sheets adhere entirely to the surface of the ZnO hollow spheres consisting of nanoparticles. The unique structure effectively decreases the density of the composite without sacrificing the contact between graphene and the nanoparticles. Different mass ratios of graphene to ZnO hollow spheres mixed in a paraffin wax matrix (50 wt%) were prepared to investigate the electromagnetic wave absorption properties in the X-band region. When the mass ratio of graphene oxide to ZnO is 12 : 88, the composite exhibits a maximum absorption of −45.05 dB at 9.7 GHz with a sample thickness of only 2.2 mm. The fundamental mechanism based on electrical conductivity and the polarization between the graphene sheets and ZnO nanoparticles is discussed. The hierarchical structure of graphene-wrapped ZnO hollow spheres exhibits a promising designable approach to lightweight electromagnetic wave absorbing materials.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
Nanotechnology Reviews
·
2021
·Vol. 10
·期 1
·1349-1358
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IF 7.848
Xiaodong Chen,Zhong-Tao Yang,Nannan Wang,Xin Gao,Gang Wang,Chunyu Song,Yunfeng Liu,Lifeng Cui
ZnO nanomaterials with the stereochemical structure were becoming a research focus in the scope of photocatalytic materials, but the ZnO was sensitive to UV light rather than the solar light source, which considerably prohibited its extended application. ZnO nanomaterials coupled with other nanomaterials could generate the alternative composite heterojunction nanomaterials to promote the photocatalytic activity. Herein, we reported two facile and feasible synthesis methods to fabricate TiO 2 /ZnO cube nanocomposites and Ag/ZnO hollow spheres by hydrothermal reaction and chemical deposition, respectively. In this regard, these composited nanomaterials have been successfully fabricated with high purities, good morphology, and crystal structure. Noticeably, in contrast with TiO 2 /ZnO and Ag/ZnO bulk nanocomposites, the Ag/ZnO hollow spheres could offer the higher activity for RhB degradation under the visible light. Moreover, the photocatalytic performance of Ag/ZnO for RhB degradation could be improved synergistically, and the effect of RhB degradation was highest when the Ag mass ratio was modulated at 10% in the sample. Furthermore, it remained a high photocatalytic efficiency even after four cycles. This protocol provided an approvable approach to fabricate efficient photocatalysts with persistent photostability in the wastewater treatment process.
Graphical abstract
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 19
·5113-5121
·
IF 5.976
Zehao Song,Hai Zhou,Pengbin Gui,Xiaohan Yang,Ronghuan Liu,Guokun Ma,Hao Wang,Guojia Fang
Self-powered light-emitting photodetectors (SLEPs) can simultaneously transmit and receive information using light, offering huge potential for applications in interactive communication systems. However, high-performance SLEPs are very hard to achieve due to the seriously contradictory principles of carrier transport in SLEPs. In this study, a novel structure based on a ZnO hollow ball/CsPbBr3 heterojunction, in which ZnO hollow balls function as an ultraviolet (UV) response center and CsPbBr3 is designed to be a green light-emitting material, is reported as a high-performance SLEP. Since the ZnO hollow balls have superior light trapping characteristics for UV light, the device shows a huge UV response with the on/off ratio and detectivity up to 16 527 and 2.4 × 1013 Jones, respectively. Moreover, it displays blue emission with a low threshold voltage because of CsPbBr3. Compared with the traditional ZnO/GaN structure devices, the device showed enhanced dual-functional performance at various wavelengths due to the insertion of CsPbBr3, which resulted in a better contact interface and green-light emission center. Our structure separating the light-responsive and emitting active regions avoids the contradictory principles of carrier transport, which may provide new access to gain high-performance dual-functional devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）