The Experts below are selected from a list of 41997 Experts worldwide ranked by ideXlab platform
Xinqi Chen - One of the best experts on this subject based on the ideXlab platform.
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room temperature synthesis of cu2 xe e s se nanotubes with Hierarchical Architecture as high performance counter electrodes of quantum dot sensitized solar cells
Chemistry: A European Journal, 2015Co-Authors: Xinqi Chen, Yang Bai, Qiao Sun, Lianzhou Wang, S X DouAbstract:Copper chalcogenide nanostructures (e.g. one- dimensional nanotubes) have been the focus of interest because of their unique properties and great potential in various applications. Their current fabrications mainly rely on high-temperature or complicated processes. Here, with the assistance of theoretical prediction, we prepared Cu2-xE (E=S, Se) micro-/nanotubes (NTs) with a Hierarchical Architecture by using copper nanowires (Cu NWs), stable sulfur and selenium powder as precursors at room temperature. The influence of reaction parameters (e.g. precursor ratio, ligands, ligand ratio, and reaction time) on the formation of nanotubes was comprehensively investigated. The resultant Cu2-xE (E=S, Se) NTs were used as counter electrodes (CE) of quantum-dot-sensitized solar cells (QDSSCs) to achieve a conversion efficiency () of 5.02 and 6.25%, respectively, much higher than that of QDSSCs made with Au CE (=2.94%).
Quanfeng Dong - One of the best experts on this subject based on the ideXlab platform.
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a Hierarchical Architecture s mwcnt nanomicrosphere with large pores for lithium sulfur batteries
Physical Chemistry Chemical Physics, 2012Co-Authors: Jiajia Chen, Qian Zhang, Yining Shi, Linlin Qin, Yong Cao, Mingsen Zheng, Quanfeng DongAbstract:A Hierarchical S/MWCNT nanomicrosphere for lithium/sulfur batteries with a high power and energy density as well as an excellent cycle life is introduced. Sulfur was uniformly coated on the surface of functional MWCNTs, which serves as a carbon matrix, to form a typical nanoscale core–shell structure with a sulfur layer of thickness 10–20 nm. Then the nanoscale sulfur intermediate composite was ball-milled to form interwoven and porous sphere Architecture with large pores (around 1 μm to 5 μm). Different from most sulfur/carbon materials with micropore and mesopore structure, the micrometre scale S/MWCNT nanomicrosphere with a large pore structure could also exhibit high sulfur utilization and cycle retention. It could maintain a reversible capacity of 1000 mA h g−1 after 100 cycles at 0.3 A g−1 current density. And it even remained 780 mA h g−1 after 200 cycles at 0.5 A g−1 and 650 mA h g−1 after 200 cycles at 1 A g−1, showing a significant cyclability enhancement. It is believed that under the collective effect of Hierarchical Architecture, as well as the existence of carboxyl functional groups, sulfur/carbon materials with large pores could also exhibit an excellent electrochemical performance. The synthesis process introduced here is simple and broadly applicable, which would not only be beneficial to design new materials for lithium sulfur batteries but can also be extended to many different electrode materials for lithium ion batteries.
S X Dou - One of the best experts on this subject based on the ideXlab platform.
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room temperature synthesis of cu2 xe e s se nanotubes with Hierarchical Architecture as high performance counter electrodes of quantum dot sensitized solar cells
Chemistry: A European Journal, 2015Co-Authors: Xinqi Chen, Yang Bai, Qiao Sun, Lianzhou Wang, S X DouAbstract:Copper chalcogenide nanostructures (e.g. one- dimensional nanotubes) have been the focus of interest because of their unique properties and great potential in various applications. Their current fabrications mainly rely on high-temperature or complicated processes. Here, with the assistance of theoretical prediction, we prepared Cu2-xE (E=S, Se) micro-/nanotubes (NTs) with a Hierarchical Architecture by using copper nanowires (Cu NWs), stable sulfur and selenium powder as precursors at room temperature. The influence of reaction parameters (e.g. precursor ratio, ligands, ligand ratio, and reaction time) on the formation of nanotubes was comprehensively investigated. The resultant Cu2-xE (E=S, Se) NTs were used as counter electrodes (CE) of quantum-dot-sensitized solar cells (QDSSCs) to achieve a conversion efficiency () of 5.02 and 6.25%, respectively, much higher than that of QDSSCs made with Au CE (=2.94%).
Qiao Sun - One of the best experts on this subject based on the ideXlab platform.
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room temperature synthesis of cu2 xe e s se nanotubes with Hierarchical Architecture as high performance counter electrodes of quantum dot sensitized solar cells
Chemistry: A European Journal, 2015Co-Authors: Xinqi Chen, Yang Bai, Qiao Sun, Lianzhou Wang, S X DouAbstract:Copper chalcogenide nanostructures (e.g. one- dimensional nanotubes) have been the focus of interest because of their unique properties and great potential in various applications. Their current fabrications mainly rely on high-temperature or complicated processes. Here, with the assistance of theoretical prediction, we prepared Cu2-xE (E=S, Se) micro-/nanotubes (NTs) with a Hierarchical Architecture by using copper nanowires (Cu NWs), stable sulfur and selenium powder as precursors at room temperature. The influence of reaction parameters (e.g. precursor ratio, ligands, ligand ratio, and reaction time) on the formation of nanotubes was comprehensively investigated. The resultant Cu2-xE (E=S, Se) NTs were used as counter electrodes (CE) of quantum-dot-sensitized solar cells (QDSSCs) to achieve a conversion efficiency () of 5.02 and 6.25%, respectively, much higher than that of QDSSCs made with Au CE (=2.94%).
Ligang Feng - One of the best experts on this subject based on the ideXlab platform.
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Hierarchical Architecture of coupling graphene and 2D WS2 for high-performance supercapacitor
Electrochimica Acta, 2019Co-Authors: Wushuang Chen, Zhixin Zhao, Ligang FengAbstract:Abstract A Hierarchical Architecture of coupling graphene and 2D WS2 for high-performance supercapacitors is fabricated by a facile ice-template approach. The hybridization content of WS2 in graphene Architecture strongly affects the morphology structure and surface chemical nature of the electrode, and can significantly enhance electrochemical behaviors. As proposed, the Hierarchical WS2/graphene Architectures (WGA) showing rough and wrinkled surface can facilitate electrolyte diffusion and increase the wettability during the measurement. Meanwhile, the formation of 1T WS2 and covalent bonds at WS2/graphene interface are component for the improvement of pseudocapacitive behavior of WGA; A high performance like a superior specific capacitance (383.6 F g−1), good rate capability (79.9%) and excellent cyclic stability (102.5%) is found due to the fast proton insertion into the WS2 nanoflakes. This work provides an efficient and facile strategy to construct the Hierarchical Architectures for pseudocapacitive capacitors.