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524 results on '"Chu, Wangsheng"'

151. Surface-adsorbed ions on TiO2 nanosheets for selective photocatalytic CO2 reduction.

Author

Li, Xiaogang, Bi, Wentuan, Wang, Zhe, Zhu, Wenguang, Chu, Wangsheng, Wu, Changzheng, and Xie, Yi

Abstract

A method based on the adsorption of ions on the surface of two-dimensional (2D) nanosheets has been developed for photocatalytic CO2 reduction. Isolated Bi ions, confined on the surface of TiO2 nanosheets using a simple ionic adsorption method facilitate the formation of a built-in electric field that effectively promotes charge carrier separation. This leads to an improved performance of the photocatalytic CO2 reduction process with the preferred conversion to CH4. The proposed surface ion-adsorption method is expected to provide an effective approach for the design of highly efficient photocatalytic systems. These findings could be very valuable in photocatalytic CO2 reduction applications. [ABSTRACT FROM AUTHOR]

Published
2018
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154. Synthesis of Sub‐2 nm Iron‐Doped NiSe2 Nanowires and Their Surface‐Confined Oxidation for Oxygen Evolution Catalysis.

Author

Gu, Chao, Hu, Shaojin, Zheng, Xusheng, Gao, Min‐Rui, Zheng, Ya‐Rong, Shi, Lei, Gao, Qiang, Zheng, Xiao, Chu, Wangsheng, Yao, Hong‐Bin, Zhu, Junfa, and Yu, Shu‐Hong

Subjects
OXYGEN evolution reactions, CHEMICAL reactions, NANOWIRES, ELECTROCATALYSTS, BULK solids
Abstract

Abstract: Ultrathin nanostructures are attractive for diverse applications owing to their unique properties compared to their bulk materials. Transition‐metal chalcogenides are promising electrocatalysts, yet it remains difficult to make ultrathin structures (sub‐2 nm), and the realization of their chemical doping is even more challenging. Herein we describe a soft‐template mediated colloidal synthesis of Fe‐doped NiSe2 ultrathin nanowires (UNWs) with diameter down to 1.7 nm. The synergistic interplay between oleylamine and 1‐dodecanethiol is crucial to yield these UNWs. The in situ formed amorphous hydroxide layers that is confined to the surface of the ultrathin scaffolds enable efficient oxygen evolution electrocatalysis. The UNWs exhibit a very low overpotential of 268 mV at 10 mA cm−2 in 0.1  m KOH, as well as remarkable long‐term stability, representing one of the most efficient noble‐metal‐free catalysts. [ABSTRACT FROM AUTHOR]

Published
2018
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155. Double-Exchange Effect in Two-Dimensional MnO2Nanomaterials

Author

Peng, Xu, Guo, Yuqiao, Yin, Qin, Wu, Junchi, Zhao, Jiyin, Wang, Chengming, Tao, Shi, Chu, Wangsheng, Wu, Changzheng, and Xie, Yi

Abstract

Electronic state transitions, especially metal–insulator transitions (MIT), offer physical properties that are useful in intriguing energy applications and smart devices. But to-date, very few simple metal oxides have been shown to undergo electronic state transitions near room temperature. Herein, we demonstrate experimentally that chemical induction of double-exchange in two-dimensional (2D) nanomaterials brings about a MIT near room temperature. In this case, valence-state regulation of a 2D MnO2nanosheet induces a Mn(III)–O–Mn(IV) structure with the double-exchange effect, successfully triggering a near-room-temperature electronic transition with an ultrahigh negative magneto-resistance (MR). Double-exchange in 2D MnO2nanomaterials exhibits an ultrahigh MR value of up to −11.3% (0.1 T) at 287 K, representing the highest reported negative MR values in 2D nanomaterials approaching room temperature. Also, the MnO2nanosheet displays an infrared response of 7.1% transmittance change on going from 270 to 290 K. We anticipate that dimensional confinement of double-exchange structure promises novel magneto-transport properties and sensitive responses for smart devices.

Published
2024
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163. A New Cubic Phase for a NaYF4Host Matrix Offering High Upconversion Luminescence Efficiency

Author

Wang, Limin, primary, Li, Xiyu, additional, Li, Zhengquan, additional, Chu, Wangsheng, additional, Li, Renfu, additional, Lin, Ke, additional, Qian, Haisheng, additional, Wang, Yao, additional, Wu, Changfeng, additional, Li, Jiong, additional, Tu, Datao, additional, Zhang, Qun, additional, Song, Li, additional, Jiang, Jun, additional, Chen, Xueyuan, additional, Luo, Yi, additional, Xie, Yi, additional, and Xiong, Yujie, additional

Published
2015
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165. Stable Metallic 1T-WS2Nanoribbons Intercalated with Ammonia Ions: The Correlation between Structure and Electrical/Optical Properties

Author

Liu, Qin, primary, Li, Xiuling, additional, Xiao, Zhangru, additional, Zhou, Yu, additional, Chen, Haipin, additional, Khalil, Adnan, additional, Xiang, Ting, additional, Xu, Junqing, additional, Chu, Wangsheng, additional, Wu, Xiaojun, additional, Yang, Jinlong, additional, Wang, Chengming, additional, Xiong, Yujie, additional, Jin, Chuanhong, additional, Ajayan, Pulickel M., additional, and Song, Li, additional

Published
2015
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170. Enhanced Electrochemical Performance of Ti-Doping Li1. 15Ni0. 47Sb0. 38O2 as Lithium-excess Cathode for Lithium-ion Batteries.

Author

Su, Xiaozhi, Wang, Xingbo, Chen, Haiping, Yu, Zhen, Qi, Jiaxin, Tao, Shi, Chu, Wangsheng, and Song, Li

Subjects
PERFORMANCE of electric batteries, LITHIUM cell electrodes, DOPED semiconductors, X-ray absorption near edge structure, LITHIUM-ion batteries, PERCOLATION
Abstract

Recent success and application of the percolation theory have highlighted cation-disordered Li-rich oxides as high energy density cathode materials. Generally, this kind of cathode materials suffer from low cycling stability and rate performance. Doped Ti4+ ions can improve the long-term cycling stability and rate performance of the Li-rich oxides materials with obvious capacity fading. The electrochemical performance in Li xNi2−4 x/3Sb x/ 3O2 can benefit a lot from the nanohighway, which is a kind of nanoscale 0- TM diffusion channels in the transition metal layer and provides low diffusion barrier pathways for the lithium diffusion. In this work, the doping effect of Ti on the structure and electrochemical properties in Li1. 15Ni0. 47Sb0. 38O2 is studied. The Ti-stabilized Li1.15− xNi0. 47Ti xSb0. 38O2 ( x=0, 0.01, 0.03 and 0.05) have been prepared by a solid-state method and the Li1. 03Ni0. 47Sb0. 38Ti0. 03O2 sample exhibits outstanding electrochemical performance with a larger reversible discharge capacity, better rate capability and cyclability. Synchrotron-based XANES, combined with ab initio calculations in the multiple-scattering framework, reveals the Ti ions have been doped into the Li-site in the lithium layer and formed a distortion TiO6 octahedron. This TiO6 local configuration in the lithium can keep the stability of nanohighway in the electrochemical process. In particular, the Li1. 03Ni0. 47Sb0. 38Ti0. 03O2 compound can deliver a discharge capacities 132 and 76 mAh/g at 0.2 and 5 C, respectivly. About 86% capacity retention occurs at 1 C rate after 500 cycles. This work suggests capacity fading in the oxide cathode materials can be suppressed to construct and stabilize the nanohighway. [ABSTRACT FROM AUTHOR]

Published
2017
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177. Nanosheets: Solvothermal Synthesis of Ternary Cu2MoS4Nanosheets: Structural Characterization at the Atomic Level (Small 22/2014)

Author

Chen, Wenxing, primary, Chen, Haiping, additional, Zhu, Hangtian, additional, Gao, Qingqing, additional, Luo, Jun, additional, Wang, Yu, additional, Zhang, Shuo, additional, Zhang, Ke, additional, Wang, Chengming, additional, Xiong, Yujie, additional, Wu, Yanfei, additional, Zheng, Xusheng, additional, Chu, Wangsheng, additional, Song, Li, additional, and Wu, Ziyu, additional

Published
2014
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182. Solvothermal Synthesis of Ternary Cu2MoS4Nanosheets: Structural Characterization at the Atomic Level

Author

Chen, Wenxing, primary, Chen, Haiping, additional, Zhu, Hangtian, additional, Gao, Qingqing, additional, Luo, Jun, additional, Wang, Yu, additional, Zhang, Shuo, additional, Zhang, Ke, additional, Wang, Chengming, additional, Xiong, Yujie, additional, Wu, Yanfei, additional, Zheng, Xusheng, additional, Chu, Wangsheng, additional, Song, Li, additional, and Wu, Ziyu, additional

Published
2014
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188. The structural determination of endohedral metallofullerene Gd@C-82 by XANES

Author

Liu, Lei, Gao, Bin, Chu, Wangsheng, Chen, Dongliang, Hu, Tiandou, Wang, Chunru, Dunsch, Lothar, Marcelli, Augusto, Luo, Yi, Wu, Ziyu, Liu, Lei, Gao, Bin, Chu, Wangsheng, Chen, Dongliang, Hu, Tiandou, Wang, Chunru, Dunsch, Lothar, Marcelli, Augusto, Luo, Yi, and Wu, Ziyu

Abstract

Although the Gd ion in Gd@C-82 has been shown to lie above the C-C bond on the C-2 axis as an anomalous structure from the MEM/Rietveld analysis, the present XANES study reveals that it lies above the hexagon on the C-2 axis as a normal structure, and Gd oscillates around its equilibrium position with an amplitude increasing with temperature increase., QC 20100726

Published
2008
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189. 3D local structure around Zn in Kti11p as a representative Zn-(Cys)4 motif as obtained by MXAN

Author

Yu, Meijuan, Yang, Feifei, Chu, Wangsheng, Wang, Yu, Zhao, Haifeng, Gao, Bin, Zhao, Wei, Sun, Jianping, Wu, Fangming, Zhang, Xiaowei, Shi, Yunyu, Wu, Ziyu, Yu, Meijuan, Yang, Feifei, Chu, Wangsheng, Wang, Yu, Zhao, Haifeng, Gao, Bin, Zhao, Wei, Sun, Jianping, Wu, Fangming, Zhang, Xiaowei, Shi, Yunyu, and Wu, Ziyu

Abstract

Zinc is an important component of many proteins that play key roles in transcription, translation, and catalysis. Kti11p, DESR1, both belonging to a protein family characterized by a CSL zinc finger domain, and the co-catalytic zinc-protein PML containing a Zn2+ binding domain called RING or C3HC4 finger are all structurally determined by NMR although the zinc sites are silent to this spectroscopical method. The comparison of X-ray absorption near-edge spectroscopy (XANES) data for the three proteins demonstrates that fingerprints effect is a reliable method for a primary characterization of ligand species. Ab initio full MS Calculations performed by MAN are applied to obtain chemical and stereo structural information around the Zn ion in Kti11p. For the first time this high-spatial resolution technique confirms the formation of a stable Zn tetrahedral configuration with four sulfur ligands, and returns extremely accurate bond angle information between ligands., QC 20110601

Published
2008
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200. Atomically Dispersed Iron-Nitrogen Species as Electrocatalysts for Bifunctional Oxygen Evolution and Reduction Reactions.

Author

Chen, Pengzuo, Zhou, Tianpei, Xing, Lili, Xu, Kun, Tong, Yun, Xie, Hui, Zhang, Lidong, Yan, Wensheng, Chu, Wangsheng, Wu, Changzheng, and Xie, Yi

Subjects
OXYGEN evolution reactions, RENEWABLE energy industry, OXIDATION-reduction reaction, ENERGY storage, ELECTROCATALYSIS
Abstract

Rational design of non-noble materials as highly efficient, economical, and durable bifunctional catalysts for oxygen evolution and reduction reactions (OER/ORR) is currently a critical obstacle for rechargeable metal-air batteries. A new route involving S was developed to achieve atomic dispersion of Fe-N x species on N and S co-decorated hierarchical carbon layers, resulting in single-atom bifunctional OER/ORR catalysts for the first time. The abundant atomically dispersed Fe-N x species are highly catalytically active, the hierarchical structure offers more opportunities for active sites, and the electrical conductivity is greatly improved. The obtained electrocatalyst exhibits higher limiting current density and a more positive half-wave potential for ORR, as well as a lower overpotential for OER under alkaline conditions. Moreover, a rechargeable Zn-air battery device comprising this hybrid catalyst shows superior performance compared to Pt/C catalyst. This work will open a new avenue to design advanced bifunctional catalysts for reversible energy storage and conversion devices. [ABSTRACT FROM AUTHOR]

Published
2017
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