VN hollow spheres assembled from porous nanosheets for high-performance lithium storage and the oxygen reduction reaction
VN hollow spheres assembled from porous nanosheets for high-performance lithium storage and the oxygen reduction reaction
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由多孔纳米片组装而成的 VN 空心球，用于高性能锂存储和氧还原反应
DOI：
10.1039/c6ta01707j
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Minhua Cao
中科院分区：
文献类型：
--
作者：
Di Zhao;Zhentao Cui;Shuguang Wang;Jinwen Qin;Minhua Cao
用一种简单的方法简单地合成定义良好的中空结构仍然是一个巨大的挑战，特别是对于过渡金属氮化物(TMN)。在这里，我们展示了一种模板辅助的策略来制备由多孔纳米片组装的VN空心球(VN HSS)。所合成的VNHSS具有层次化的大孔-中孔结构(大孔尺寸为2 5 0 nm，中孔尺寸为5~30 nm)、高比表面积(66m2 g−1)和均匀的介孔壳层(厚度为55 nm)。这种层次化的多孔结构特别有利于反应物的传质。鉴于这些结构优势，VN HSS表现出优异的储锂性能和对氧还原反应(ORR)的高催化活性。因此，本工作为设计和合成在锂离子电池和其他电化学能量转换和存储设备中具有显著提高性能的分层多孔氮化物提供了一条很有前途的途径。
The facile synthesis of well-defined hollow structures via a simple method remains a great challenge, especially for transition-metal nitrides (TMNs). Herein, we demonstrate a template-assisted strategy for the fabrication of VN hollow spheres (VN HSs) assembled from porous nanosheets. The resultant VN HSs have a hierarchical macroporous–mesoporous structure (the macropore size: 250 nm and the mesopore sizes: 5–30 nm), high surface area (66 m2 g−1), and uniform mesoporous shell with a thickness of 55 nm. The hierarchical porous structure is particularly beneficial for the mass transfer of reactant species. In view of these structural advantages, the VN HSs exhibit excellent lithium storage performance and high catalytic activity for the oxygen reduction reaction (ORR). Therefore, this work provides a promising approach for the design and synthesis of hierarchical porous nitrides with significantly enhanced performances in lithium-ion batteries and other electrochemical energy conversion and storage devices.