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Your search keyword '"Zhong, Qin"' showing total 30 results
Start Over Author "Zhong, Qin" Journal journal of colloid and interface science
30 results on '"Zhong, Qin"'

28. Oxygen vacancy mediated single unit cell Bi2WO6 by Ti doping for ameliorated photocatalytic performance

Author

Shahnoor, Yue Mao, Amjad Ali, Tahir Muhmood, Shen-Ming Chen, Min Zhang, Baojing Zhou, Zhong Qin, Muhammad Arif, Qingxia Bu, and Xiaoheng Liu

Subjects
Materials science, Dopant, business.industry, 02 engineering and technology, Crystal structure, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Crystallographic defect, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Biomaterials, Crystal, Colloid and Surface Chemistry, Semiconductor, Chemical engineering, Photocatalysis, Density of states, Charge carrier, 0210 nano-technology, business
Abstract

Crystal defects are crucially important in semiconductor photocatalysis. To improve the reactivity of photocatalysts and attain desirable solar energy conversion, crystal defect engineering has gained considerable attention in real catalysts. Herein, we engineered crystal defects and mediate oxygen vacancies in host Bi2WO6 crystal lattice via varying content of Ti dopant to fabricate single-unit-cell layered structure, resulting in enhanced visible-light-driven photocatalytic efficiency. Density functional theory (DFT) calculations verified that the substitution of Bi cation in the crystal structure of Bi2WO6 can induce a new defect level, and increase the density of states (DOS) at the valence band maximum, which not only improve the charge dynamic but also the electronic conductivity. Remarkably, the single-unit-cell layers Ti-doped Bi2WO6 structure casts profoundly improved photocatalytic performance towards ceftriaxone sodium degradation, Cr(VI) reduction, and particularly higher photocatalytic H2 production rate, with a 5.8-fold increase compared to bulk Bi2WO6. Furthermore, the photoelectrochemical measurements unveil that the significantly higher charge migration and charge carrier dynamic counts for the elevated photocatalytic performance. After careful examination of experimental results, it was proved that the Ti doping mediated crystal defects, and engendered oxygen vacancies are critically important for controlling the photocatalytic performance of Bi2WO6.

Published
2021
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29. Oxygen vacancy mediated single unit cell Bi

Author

Muhammad, Arif, Min, Zhang, Yue, Mao, Qingxia, Bu, Amjad, Ali, Zhong, Qin, Tahir, Muhmood, Shahnoor, Xiaoheng, Liu, Baojing, Zhou, and Shen-Ming, Chen

Abstract

Crystal defects are crucially important in semiconductor photocatalysis. To improve the reactivity of photocatalysts and attain desirable solar energy conversion, crystal defect engineering has gained considerable attention in real catalysts. Herein, we engineered crystal defects and mediate oxygen vacancies in host Bi

Published
2020

30. Introducing different long-chain flexible ligands to regulate the transformation behavior of NiFe-MOF and as bifunctional catalysts for the HER/OER.

Author

Dai B, Wei X, Chen L, Bao X, Zhong Q, and Qu H

Abstract

The investigation of highly efficient metal-organic framework (MOF) electrocatalysts represents a pivotal challenge in enhancing the overall efficiency of water electrolysis. In this study, we present a co-liganding method based on molecular regulation, in which succinic (s.a), adipic (a.a), and decanedioic (d.a) acids are employed to modify the original ligand H 2 BDC-based bimetallic NiFe-MOF to obtain dual-ligand NiFe-MOF electrocatalysts with excellent OER and HER performance (NiFe-MOF s.a, NiFe-MOF a.a, and NiFe-MOF d.a). Notably, NiFe-MOF d.a performs the best, particularly in 1 M KOH solution, with an OER overpotential of 242 mV and an HER overpotential of 116 mV at a current density of 10 mA cm -2 , and it demonstrates excellent stability under alkaline conditions, outperforming several recently reported Fe/Co/Ni-based catalysts. Bader charge and Mulliken charge calculations alongside experimental characterization data indicate that long-chain dicarboxylate ligands can influence the morphology, oxygen vacancy formation, and electronic structure of NiFe-MOFs. XPS and XRD analyses after the OER reveal that the four NiFe-MOFs undergo structural reorganization, with NiFe-MOF d.a having more unsaturated metal sites and more oxygen vacancies, promoting greater conversion of the MOF to NiOOH and FeOOH, which is beneficial for improving the OER performance. The density of states (DOS) results from DFT calculations demonstrate that the d-band center of NiFe-MOF d.a is relatively low, indicating that the adsorption energy of H* is reduced, which can promote the release of H 2 . Furthermore, the hydrogen adsorption free energy (ΔG H* ) values of the Fe and Ni active sites within NiFe-MOF d.a are closer to zero, thus accelerating the HER kinetics. This work paves new pathways for realizing dual-ligand MOFs., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Inc. All rights reserved.)

Published
2024
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