中文摘要：生物硅化是自然界中最精细的生物过程之一，与形态多样的生物硅密切相关，为材料合成提供了丰富的灵感。为了探索生物二氧化硅的形成过程并制备用于锂电池（LIB）电极的具有精细微观结构的二氧化硅，本研究以细菌噬菌体（M13）为生物模板，合成了圆柱体、六棱柱、小圆柱体与纳米线的组合等不同形态的二氧化硅。本研究采用简易的乙醇浴法用含氮碳包覆纳米线，并首次将碳包覆的具有介孔的SiO2纳米线(C@msSiO(2)NWs)用作LIBs的阳极材料。由于均匀的碳涂层和平行的介孔结构，材料的导电性和适应体积变化的能力显著提高。电化学性能测试中，在750℃(C@msSiO(2)NWs-750)下煅烧的复合材料电流密度为500 mA g(-1)时电容为653 mA h g(-1)，且性能稳定(1000次循环)。鉴于电化学测试结果，通过仿生策略很容易制备出具有优异电位的复杂结构。
外文摘要：As one of the most delicate bioprocesses in nature, biosilicification is closely related to biosilica with various morphologies, and has provided abundant inspiration to materials synthesis. In the present study, to explore the biosilica formation process and fabricate silica with an exquisite microstructure for lithiumion battery (LIB) electrodes, a bacterial phage (M13) is used as a biotemplate to synthesize silica with diverse morphologies: cylinders, hexagonal prisms, assemblies of smaller cylinders and nanowires. A facile ethanol bath method is conducted to coat the nanowires with nitrogen-containing carbon and carbon-coated SiO2 nanowires with mesochannels (C@msSiO(2)NWs) are first used as anode materials for LIBs. Attributed to the uniform carbon coating and parallel mesochannel structure, the electronic conductivity and capacity to accommodate volume variations were significantly improved. In the electrochemical performance test, the composites calcined at 750 degrees C (C@msSiO(2)NWs-750) show an impressive capacity of 653 mA h g(-1) at a current density of 500 mA g(-1) and stability (1000 cycles). In view of the electrochemical test outcomes, the preparation of a sophisticated structure with an outstanding potential is easily achieved via a biomimetic strategy.
外文关键词：Biomimetic preparation；Biosilicification；M13 phage；Silica nanowires； Mesochannel
作者：Wan, FQ；Wang, WX；Zou, ZY；Xie, H；Ping, H；Fu, ZY
作者单位：Wuhan Univ Technol
期刊名称：JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
期刊影响因子：6.155
出版年份：2021
出版刊次：72
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