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| 1 | High-performance lithium-sulfur battery based on porous N-rich g-C_(3)N_(4) nan-otubes via a self-template method显示文摘The commercial development of lithium-sulfur batteries(Li-S)is severely limited by the shuttle effect of lithium polysulfides(LPSs)and the non-conductivity of sulfur.Herein,porous g-C_(3)N_(4) nanotubes(PCNNTs)are synthesized via a self-template method and utilized as an efficient sulfur host material.The one-dimensional PCNNTs have a high specific surface area(143.47 m^(2)·g^(-1))and an abundance of macro-/mesopores,which could achieve a high sulfur loading rate of 74.7wt%.A Li-S battery bearing the PCNNTs/S composite as a cathode displays a low capacity decay of 0.021% per cycle over 800 cycles at 0.5 C with an initial capacity of 704.8 mAh·g^(-1).PCNNTs with a tubular structure could alleviate the volume expansion caused by sulfur and lithium sulfide during charge/discharge cycling.High N contents could greatly enhance the adsorption capacity of the carbon nitride for LPSs.These synergistic effects contribute to the excellent cycling stability and rate performance of the PCNNTs/S composite electrode. | Meng-rong Wu Ming-yue Gao Shu-ya Zhang Ru Yang Yong-ming Chen Shang-qing Sun Jin-feng Xie Xing-mei Guo Fu Cao Jun-hao Zhang | 2021 | International Journal of Minerals,Metallurgy and Materials2021，28，10： | 2 |
| 2 | Preparation and Characterization of Porous Carbon from Mixed Leaves for High-Performance Supercapacitors显示文摘With the increasing demand of sustainable and eco-friendly resources,it is very attractive to use waste leaves for activated carbon(AC)preparation that can be used in supercapacitors.Considering the practically collected leaves are commonly in mixed nature,and extra efforts are needed to sort these mixtures,we here report the first preparation of AC using mixed leaves from different plants,including Platanus acerifolia(PA),Firmiana platanifolia(FP)and Pistia stratiotes(PS),and compared the results with single leaves-derived AC materials.These leave-derived AC samples were characterized with FESEM,EDS,FTIR and Raman spectroscopy,and electrochemical tests.The AC derived from mixed leaves(PA3FP1PS2AC)showed a good specific capacitance of 246 F·g−1 at 1 A·g−1 in aqueous 3 mol·L^(-1)KOH.This sample further showed the largest specific capacitance of 201 F·g−1 at 5 A·g−1,as compared with the non-mixed AC samples,and a good stability of 100.0%capacitance retention over 1000 cycles.Utilizing mixed leaves for AC preparation is not only demonstrated to be a promising approach of low cost and high-performance AC production for supercapacitor applications,but may also help environmental protection by reducing the invasive species problem. | Xiaoxiang Yang Jie Xu Xin Chen Yuli Lei Lingling Wang Siyu Cheng Yan Li Yuxuan Lu Yupeng Zhu Na Chen | 2021 | Chinese Journal of Chemistry2021，39，2： | 2 |
| 3 | Utilizing the Alterable Solubility of Chitosan in Aqueous Solution to Synthesize Nanosized Sulfur for High Performance Li-S Batteries显示文摘Summary of main observation and conclusion We demonstrate the synthesis of cathode material with nanosized sulfur by a precipitation method making use of the alterable solubility of chitosan (CTS) in aqueous solution.Mesoporous Ketjen Black (KB) and carbon nanotube (CNT) are added as conductive agents to provide the three-dimensional electric channels.This method can reduce the size of the sulfur particles,thus the nanosized sulfur obtained can fully contact with the conductive agent,which could increase the utilization of sulfur and improve the capacity of Li-S batteries.Moreover,CTS with abundant hydroxyl and amine groups has strong interaction with polysulfides,which can improve the stability of Li-S batteries.As a result,the obtained CTS/C-S cathode containing 76 wt% sulfur delivers an impressively initial discharge specific capacity of 1141.6 mA.h.g^-1 at 0.5 C and maintains a capacity of 842.3 mA·h·g-1 after 300 cycles.Our finding paves a way for the rational design of high-performance sulfur cathodes for advanced Li-S batteries. | Yu Zhang Wen-Cui Li Bin He Xiao-Fei Yu Lu Hou An-Hui Lu | 2019 | Chinese Journal of Chemistry2019，37，8： | 1 |
| 4 | 发展名茶名牌 开发茶业经济新增长点显示文摘茶叶市场供过于求,竞争日趋激烈,竞争焦点是质量、价格和品牌。发展名茶名牌,以带动21世纪茶业经济可持续发展。 | 徐永成 | 2000 | 中国茶叶加工2000，，2： | 1 |
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