Free-Standing Crystalline@Amorphous Core-Shell Nanoarrays for Efficient Energy Storage

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Shuting FuMingmei Wu

Abstract

Structures comprising high capacity active material are highly desirable in the development of advanced electrodes for energy storage devices. However, the structure degradation of such material still remains a challenge. The construction of amorphous and crystalline heterostructure appears to be a novel and effectual strategy to figure out the problem, owing to the distinct properties of the amorphous protective layer. Herein, crystalline-Co3 O4 @amorphous-TiO2 core-shell nanoarrays directly grown on the carbon cloth substrate are rationally designed to construct the free-standing electrode. In the unique structure, the 3D porous nanoarrays provide increased availability of electrochemical active sites, and the array with a unique heterostructure of crystalline Co3 O4 core and amorphous TiO2 shell exhibits intriguing synergistic properties. Besides, the amorphous TiO2 protective layer shows elastic behavior to mitigate the volume effect of Co3 O4 . Benefiting from these structural advantages, the as-prepared free-standing electrode exhibits superior lithium storage properties, including high coulombic efficiency, outstanding cyclic stability, and rate capability. Pouch cells with high flexibility are also fabricated and show r...Continue Reading

References

Oct 10, 2012·Proceedings of the National Academy of Sciences of the United States of America·Na LiHui-Ming Cheng
May 1, 2013·Angewandte Chemie·Joachim Maier
Jun 4, 2016·Nature Communications·Guoqiang TanKhalil Amine
Jul 27, 2018·Nature·Kent J GriffithClare P Grey
Oct 4, 2018·Nature Communications·Zhaoyong LinGuowei Yang
Jan 3, 2019·ACS Applied Materials & Interfaces·Jin-Yi LiYu-Guo Guo
Jan 27, 2019·Advanced Materials·Ziping WuZhongfan Liu
Mar 5, 2019·Journal of the American Chemical Society·Jun-Yu PiaoLi-Jun Wan
Apr 30, 2019·Angewandte Chemie·Wontae LeeWon-Sub Yoon

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