Hierarchical hollow spheres composed of ultrathin Fe2O3 nanosheets for lithium storage and photocatalytic water oxidation
Hierarchical hollow spheres composed of ultrathin Fe2O3 nanosheets for lithium storage and photocatalytic water oxidation
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DOI：
10.1039/c2ee24148j
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发表时间：
2013-02
影响因子：
32.5
通讯作者：
Jixin Zhu;Z. Yin;Dan Yang;T. Sun;Hong Yu;H. Hoster;H. Hng;Hua Zhang;Q. Yan
中科院分区：
文献类型：
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作者：
Jixin Zhu;Z. Yin;Dan Yang;T. Sun;Hong Yu;H. Hoster;H. Hng;Hua Zhang;Q. Yan
以α-Fe_2O_3纳米片为原料，通过简单的工艺制备了自组织的中空分级球。这些纳米片亚单元具有约3.5 nm的平均厚度，并显示出（110）面的优先暴露。测试了它们的储锂性能和可见光光催化水氧化性能。这样的分级纳米结构显示出高的Li储存性能，具有良好的循环稳定性和优异的倍率性能。在可见光照射下，水氧化催化活性为70 μmol h-1 g-1，可保持15小时。这些α-Fe 2 O3纳米晶的结构特征被认为是重要的，导致有吸引力的性能在Li存储和光催化水氧化，如中空的内部，厚度和大部分暴露的活性面。
Hollow hierarchical spheres self-organized from the ultrathin nanosheets of α-Fe2O3 were prepared by a simple process. These ultrathin nanosheet subunits possess an average thickness of around 3.5 nm and show preferential exposure of (110) facets. Their Li ion storage and visible-light photocatalytic water oxidation performance are tested. Such hierarchical nanostructures show high Li storage properties with good cycling stability and excellent rate capabilities. The water oxidation catalytic activity is 70 μmol h−1 g−1 for O2 evolution under visible light irradiation and can be maintained for 15 hours. The structural features of these α-Fe2O3 nanocrystals are considered to be important to lead to the attractive properties in both Li storage and photocatalytic water oxidation, e.g. hollow interior, ultrathin thickness and largely exposed active facets.