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737 results on '"Tang, Yiping"'

111. Electrooxidation Performance of a Cotton-Cloth-Derived, Ni-Based, Hollow Microtubular Weave Catalytic Electrode for Methanol and Urea.

Author

Hou, Guangya, Wei, Jiaxuan, Chen, Qiang, Zhang, Jianli, and Tang, Yiping

Subjects
WEAVING patterns, POROUS metals, UREA, HYDROTHERMAL carbonization, WEAVING, METHANOL
Abstract

Increasing consumption produces a large amount of cotton textile waste, the conversion of which into porous metals used for energy purposes is of practical value. In this paper, a porous, Ni-based, hollow microtubular weave (Ni-HTW) is obtained from cotton weave by high-temperature carbonization and hydrothermal synthesis with high-temperature reduction. The Ni-based, hollow microtubules in this weave have a diameter of 5–10 μm and a wall thickness of about 1 μm, and every 15 microtubules form a loose bundle with a diameter of 150–200 μm. For improved performance, Ni(OH)2 nanosheets are further electrodeposited on the fibers' surface of the Ni-HTW to form a nano-Ni(OH)2/Ni-HTW composite electrode with a core–shell heterostructure where Ni is the core and Ni(OH)2 the shell. The combination of hollow microtubule weave morphology and nanosheet structure results in a large specific surface area and abundant active sites, and the composite electrode shows excellent electrocatalytic performance and long-term stability for methanol oxidation (MOR) and urea oxidation (UOR). The current densities can reach 303.1 mA/cm2 and 342.5 mA/cm2 at 0.8 V, and 92.29% (MOR) and 84.41% (UOR) of the pre-cycle current densities can be maintained after 2000 consecutive cycles. [ABSTRACT FROM AUTHOR]

Published
2023
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133. Mo 2 C-Loaded Porous Carbon Nanosheets as a Multifunctional Separator Coating for High-Performance Lithium–Sulfur Batteries.

Author

Zhang, Jianli, Wang, Yang, Zhou, Zhenkai, Chen, Qiang, and Tang, Yiping

Subjects
LITHIUM sulfur batteries, NANOSTRUCTURED materials, SURFACE coatings, ENERGY storage, CARBON
Abstract

Lithium–sulfur batteries have emerged as one of the promising next-generation energy storage devices. However, the dissolution and shuttling of polysulfides in the electrolyte leads to a rapid decrease in capacity, severe self-discharge, and poor high-temperature performance. Here, we demonstrate the design and preparation of a Mo2C nanoparticle-embedded carbon nanosheet matrix material (Mo2C/C) and its application in lithium–sulfur battery separator modification. As a polar catalyst, Mo2C/C can effectively adsorb and promote the reversible conversion of lithium polysulfides, suppress the shuttle effect, and improve the electrochemical performance of the battery. The lithium–sulfur battery with the Mo2C/C =-modified separator showed a good rate of performance with high specific capacities of 1470 and 799 mAh g−1 at 0.1 and 2 C, respectively. In addition, the long-cycle performance of only 0.09% decay per cycle for 400 cycles and the stable cycling under high sulfur loading indicate that the Mo2C/C-modified separator holds great promise for the development of high-energy-density lithium–sulfur batteries. [ABSTRACT FROM AUTHOR]

Published
2023
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