Fujian Key Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Materials Science and Engineering, College of Materials, Xiamen University , Xiamen 361005, China.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology , Wuhan 430070, China.
ACS Nano. 2016 Jan 26;10(1):1283-91. doi: 10.1021/acsnano.5b06650. Epub 2015 Dec 3.
Herein, we introduce a facile electrostatic attraction approach to produce zinc-silver citrate hollow microspheres, followed by thermal heating treatment in argon to ingeniously synthesize sandwich-like Ag-C@ZnO-C@Ag-C hybrid hollow microspheres. The 3D carbon conductive framework in the hybrids derives from the in situ carbonation of carboxylate acid groups in zinc-silver citrate hollow microspheres during heating treatment, and the continuous and homogeneous Ag nanoparticles on the outer and inner surfaces of hybrid hollow microspheres endow the shells with the sandwiched configuration (Ag-C@ZnO-C@Ag-C). When applied as the anode materials for lithium ion batteries, the fabricated hybrid hollow microspheres with sandwich-like shells reveal a very large reversible capacity of 1670 mAh g(-1) after 200 cycles at a current density of 0.2 A g(-1). Even at the very large current densities of 1.6 and 10.0 A g(-1), the high specific capacities of about 1063 and 526 mAh g(-1) can be retained, respectively. The greatly enhanced electrochemical properties of Ag-C@ZnO-C@Ag-C hybrid microspheres are attributed to their special structural features such as the hollow structures, the sandwich-like shells, and the nanometer-sized building blocks.
在此，我们介绍了一种简便的静电吸引方法来制备锌银柠檬酸盐中空微球，然后在氩气中进行热加热处理，巧妙地合成了三明治状的 Ag-C@ZnO-C@Ag-C 杂化中空微球。该杂化物中的 3D 碳导电骨架源自于热处理过程中锌银柠檬酸盐中空微球中羧酸盐基团的原位碳化，而外表面和内表面上连续且均匀的 Ag 纳米颗粒使壳具有三明治结构（Ag-C@ZnO-C@Ag-C）。当作为锂离子电池的阳极材料时，所制备的具有三明治壳的杂化中空微球在 0.2 A g(-1)的电流密度下循环 200 次后，具有非常大的可逆容量 1670 mAh g(-1)。即使在非常大的电流密度 1.6 和 10.0 A g(-1)下，仍可分别保持约 1063 和 526 mAh g(-1)的高比容量。Ag-C@ZnO-C@Ag-C 杂化中空微球的电化学性能得到极大提高，这归因于其特殊的结构特征，如中空结构、三明治壳和纳米级构建块。
