Irradiated Graphene Loaded with SnO2 Quantum Dots for Energy Storage
Irradiated Graphene Loaded with SnO2 Quantum Dots for Energy Storage
复制标题
负载 SnO2 量子点的辐照石墨烯用于储能
DOI：
10.1021/acsnano.5b05146
复制
发表时间：
2015-11-01
期刊：
影响因子：
17.1
通讯作者：
Shek, Chan-Hung
中科院分区：
文献类型：
--
作者：
Huang, Ruting;Wang, Lijun;Shek, Chan-Hung
二氧化锡（SnO2）和石墨烯是独特的战略功能材料，具有广泛的技术应用，特别是由于光学和电子性能的进步，在太阳能电池、光电器件和固态气体传感器领域。 SnO2 和石墨烯复合材料的微观结构演变和相关性能的多功能策略对于电极材料的开发至关重要。在这里，我们报道了一种新型复合材料，即由石墨烯纳米片（GNS）支撑的 SnO2 量子点（QD），已通过简单的水热法和电子束辐照（EBI）策略成功制备。微观结构分析表明，EBI技术可以诱导GNSs剥离并增加其层间距，导致ENS非晶化、无序和缺陷增加以及GNSs表面部分含氧官能团的去除。对GNSs负载的SnO2纳米颗粒（SnO2/GNSs）的研究表明，GNSs负载有SnO2量子点，它们均匀地分散在GNSs的两侧。有趣的是，SnO2/GNSs 的电化学性能表明，210 kGy 辐照 ENS 支撑的 SnO2 QD 表现出优异的循环响应、高比容量和高可逆容量。这种新型 SnO2/GNS 复合材料在 Li+ 嵌入/脱嵌过程中在 SnO2 电极材料中具有潜在的实际应用。
Tin dioxide (SnO2) and graphene are unique strategic functional materials with widespread technological applications, particularly in the areas of solar batteries, optoelectronic devices, and solid-state gas sensors owing to advances in optical and electronic properties. Versatile strategies for microstructural evolution and related performance of SnO2 and graphene composites are of fundamental importance in the development of electrode materials. Here we report that a novel composite, SnO2 quantum dots (QDs) supported by graphene nanosheets (GNSs), has been prepared successfully by a simple hydrothermal method and electron-beam irradiation (EBI) strategies. Microstructure analysis indicates that the EBI technique can induce the exfoliation of GNSs and increase their interlayer spacing, resulting in the increase of ENS amorphization, disorder, and defects and the removal of partial oxygen-containing functional groups on the surface of GNSs. The investigation of SnO2 nanoparticles supported by GNSs (SnO2/GNSs) reveals that the GNSs are loaded with SnO2 QDs, which are dispersed uniformly on both sides of GNSs. Interestingly, the electrochemical performance of SnO2/GNSs indicates that SnO2 QDs supported by a 210 kGy irradiated ENS shows excellent cycle response, high specific capacity, and high reversible capacity. This novel SnO2/GNS composite has potential practical applications in SnO2 electrode materials during Li+ insertion/extraction.