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Your search keyword '"Zhengqiang Xia"' showing total 4 results
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4 results on '"Zhengqiang Xia"'

1. Modifying electron transfer between photoredox and organocatalytic units via framework interpenetration for β-carbonyl functionalization

Author

Zhengqiang Xia, Cheng He, Xiaoge Wang, and Chunying Duan

Subjects
Science
Abstract

Metal organic frameworks are promising catalysts due to their porous structure and the possible incorporation of multiple active sites. Here, the authors show that interpenetrated metal-organic frameworks containing both a photocatalyst and an organocatalyst catalyse the β-alkylation of carbonyl compounds.

Published
2017
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2. Heteroatom Doping Synergistic Iron Nitride Induced Charge Redistribution of Carbon based Electrocatalyst with Boosted Oxygen Reduction Reaction

Author

Dr. Yuyu Guo, Dr. Dianyu Xu, Dr. Shuting Li, Dr. Jinxi Han, Prof. Qi Yang, Prof. Zhengqiang Xia, Prof. Gang Xie, Prof. Sanping Chen, and Prof. Shengli Gao

Subjects
Fe3N nanoparticles, Oxygen reduction reaction, S−N co-doped, Zn-air battery, Industrial electrochemistry, TP250-261, Chemistry, QD1-999
Abstract

Abstract Oxygen reduction reaction (ORR) is Achilles’ heel of zinc‐air battery. The ideal electrocatalyst for ORR should combine both high activity and high stability. In order to achieve this goal, a new N, S co‐doped carbon coated Fe3N nanoparticles electrocatalyst with redistributed charge was designed and synthesized. The doping of S elements destroyed the ordered structure of carbon matrix, which cooperated with Fe3N nanoparticles to cause charge redistribution of carbon atoms. Furthermore, the carbon shell protected Fe3N from corrosion during the electrocatalytic process. Fe3N/NSC electrocatalyst showed excellent ORR property with E1/2=0.86 V, and the zinc‐air battery assembled based on it could run stably for more than 650 hours. This work provides a strategy to regulate the redistributed charge of carbon atoms to boost its electrocatalytic activity and stability together.

Published
2023
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3. High temperature quantum tunnelling of magnetization and thousand kelvin anisotropy barrier in a Dy(2) single-molecule magnet

Author

Hongshan Ke, Wenyuan Wang, Haipeng Wu, Gang Xie, Zhengqiang Xia, Shengli Gao, Boris Le Guennic, Olivier Cador, Min Li, Sanping Chen, Vincent Montigaud, Northwest University (Xi'an), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), 21803042, National Natural Science Foundation of China, 2018M643706, China Postdoctoral Science Foundation, 725184, European Research Council, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Lanthanide, Materials science, Condensed matter physics, 010405 organic chemistry, Metals and Alloys, General Chemistry, Electronic structure, 010402 general chemistry, 01 natural sciences, Catalysis, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Hysteresis, Magnetization, Magnet, Materials Chemistry, Ceramics and Composites, [CHIM]Chemical Sciences, Single-molecule magnet, Anisotropy, Quantum tunnelling
Abstract

International audience; We report here a dinuclear DyIII iodine-bridged single-molecule magnet self-assembled by cis/trans coordination chemistry that displays a large anisotropy barrier of ca. 1300 K and a hysteresis opening temperature of 16 K. High temperature quantum tunnelling of magnetization is observed up to 56 K in zero-field and explained by the combination of the large anisotropy barrier and the local transverse field at the trans site. The results provide a model for thorough understanding of the effect of electronic structure on the magnetic behavior of lanthanide complexes.

Published
2021

4. Bromine-bridged Dy2 single-molecule magnet: magnetic anisotropy driven by cis/trans stereoisomers

Author

Sanping Chen, Vincent Montigaud, Hongshan Ke, Wenyuan Wang, Olivier Cador, Min Li, Haipeng Wu, Gang Xie, Zhengqiang Xia, Boris Le Guennic, Northwest University (Xi'an), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), 21803042, National Natural Science Foundation of China, 725184, European Research Council, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, 010405 organic chemistry, Metals and Alloys, General Chemistry, 010402 general chemistry, Magnetic hysteresis, 01 natural sciences, Catalysis, 3. Good health, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Crystallography, Magnetic anisotropy, Dipole, Octahedron, Orthogonality, Magnet, Materials Chemistry, Ceramics and Composites, [CHIM]Chemical Sciences, Single-molecule magnet, Cis–trans isomerism
Abstract

International audience; We report the first bromine-bridged dinuclear [Dy(CyPO)(μ-Br)(Br)]·2CH single-molecule magnet with an effective energy barrier of 684 K and magnetic hysteresis below 3 K. The asymmetric Dy centres present two unique stereoisomeric octahedral coordination environments depending on the cis/trans disposition of the CyPO ligands, leading to the orthogonality of the easy magnetic axes that annihilates the dipolar interactions.

Published
2019

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