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Your search keyword '"Xia, Xiaohong"' showing total 196 results
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196 results on '"Xia, Xiaohong"'

43. Rational Design and Construction of a CdS QDs/InVO4 Atomic‐Layer (110)/(110) Facet S‐Scheme Heterojunction for Highly Efficient Photocatalytic Degradation of C2H4.

Author

Dong, Yuanpeng, Ji, Peizhu, Xu, Xinyue, Li, Rong, Wang, Yin, Homewood, Kevin Peter, Xia, Xiaohong, Gao, Yun, and Chen, Xuxing

Subjects
PHOTODEGRADATION, HETEROJUNCTIONS, SEMICONDUCTOR manufacturing, ELECTRON paramagnetic resonance, X-ray photoelectron spectroscopy
Abstract

Exploring high efficiency S‐scheme heterojunction photocatalysts with strong redox ability for removing volatile organic compounds from the air is of great interest and importance. However, how to predict and regulate the transport of photogenerated carriers in heterojunctions is a great challenge. Here, density functional theory calculations were first used to successfully predict the formation of a CdS quantum dots/InVO4 atomic‐layer (110)/(110) facet S‐scheme heterojunction. Subsequently, a CdS quantum dots/InVO4 atomic‐layer was synthesized by in‐situ loading of CdS quantum dots with (110) facets onto the (110) facets of InVO4 atomic‐layer. As a result of the deliberately constructed built‐in electric field between the adjoining facets, we obtain a remarkably enhanced photocatalytic degradation rate for ethylene. This rate is 13.8 times that of pure CdS and 13.2 times that of pure InVO4. In‐situ irradiated X‐ray photoelectron spectroscopy, photoluminescence and time‐resolved photoluminescence measurements were carried out. These experiments validate that the built‐in electric field enhanced the dissociation of photoexcited excitons and the separation of free charge carriers, and results in the formation of S‐scheme charge transfer pathways. The reaction mechanism of the photocatalytic C2H4 oxidation is investigated by in‐situ electron paramagnetic resonance. This work provides a mechanistic insight into the construction and optimization of semiconductor heterojunction photocatalysts for application to environmental remediation. [ABSTRACT FROM AUTHOR]

Published
2024
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44. Remarkably Enhanced Methane Sensing Performance at Room Temperature via Constructing a Self‐Assembled Mulberry‐Like ZnO/SnO2 Hierarchical Structure.

Author

Li, Xun, Tan, Tian, Ji, Wei, Zhou, Wanling, Bao, Yuwen, Xia, Xiaohong, Zeng, Zhangfan, and Gao, Yun

Subjects
GAS leakage, GAS detectors, METHANE, HUMIDITY, METALLIC oxides
Abstract

Development of metal oxide semiconductors‐based methane sensors with good response and low power consumption is one of the major challenges to realize the real‐time monitoring of methane leakage. In this work, a self‐assembled mulberry‐like ZnO/SnO2 hierarchical structure is constructed by a two‐step hydrothermal method. The resultant sensor works at room temperature with excellent response of ~56.1% to 2000 ppm CH4 at 55% relative humidity. It is found that the strain induced at the ZnO/SnO2 interface greatly enhances the piezoelectric polarization on the ZnO surface and that the band bending results in the accumulation of chemically adsorbed O2− ions close to the interface, leading to significant improvement in the sensing performance of the methane gas sensor at room temperature. [ABSTRACT FROM AUTHOR]

Published
2024
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45. Multi‐Hierarchical Heterostructure NiCo2O4/ZnCo2O4/CC Anode for Fast and Stable Lithium Storage.

Author

Li, Shuangpeng, Yuan, Yi, Zhou, Jiaying, Xiao, Huang, Zhao, Chenyu, Xia, Xiaohong, Bao, Yuwen, Lourenco, Manon, Homewood, Kevin, and Gao, Yun

Subjects
TRANSITION metal oxides, ELECTRIC conductivity, NANOSTRUCTURED materials, CARBON fibers, LAMINATED metals, LITHIUM, ANODES, NANOWIRES
Abstract

Transition metal oxides, especially bimetal oxides, are considered as one of the most promising anode materials for high‐performance lithium‐ion batteries (LIBs) due to their ultra‐high theoretical capacity. However, it is difficult to achieve fast charging at high rates due to the issues of poor electrical conductivity, large volume expansion, and poor reaction kinetics. The design of advanced nanostructured anode materials is very important to boost lithium storage performance. Herein, the multi‐hierarchical heterostructure material NiCo2O4/ZnCo2O4/Carbon Cloth (NCO/ZCO/CC) including carbon cloth substrate, ZnCo2O4 nanosheets, and NiCo2O4 nanowires is prepared as a binder‐free anode for LIBs. Benefiting from the special hierarchical nanostructure and the synergistic interaction of the component, the as‐prepared NCO/ZCO/CC anode material exhibits good electrical conductivity, structural stability, and electrochemical kinetics, which can provide a high reversible areal capacity of 2.55 mAh cm−2 at 2 mA cm−2 after 200 cycles. At a high current density of 5 mA cm−2, the NCO/ZCO/CC electrode only takes about 20 min to fully charge and it can still reach a capacity of 1.50 mAh cm−2 with a capacity retention of 86.2% after 400 cycles, revealing the potential for fast charging at high rates. [ABSTRACT FROM AUTHOR]

Published
2024
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