Composition-dependent lithium storage performances of SnS/SnO2 heterostructures sandwiching between spherical graphene
Composition-dependent lithium storage performances of SnS/SnO2 heterostructures sandwiching between spherical graphene
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夹在球形石墨烯之间的 SnS/SnO2 异质结构的成分依赖性锂存储性能
DOI：
10.1016/j.electacta.2019.01.116
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发表时间：
2019-03
影响因子：
6.6
通讯作者：
Jiang Yong
中科院分区：
文献类型：
--
作者：
Zhao Bing;Zhuang Hua;Yang Yaqing;Wang Yanyan;Tao Haihua;Wang Zhixuan;Jiang Jinlong;Chen Zhiwen;Huang Shoushuang;Jiang Yong
异质结构由于具有新颖的界面效应和增强的电子传递动力学，在能量转换材料和光电子器件中有着广阔的应用前景。在此，我们报道了一种异质结构的SnS/SnO2/球形石墨烯复合材料，其中具有异质结构的超细SnS/SnO2纳米颗粒夹在多层石墨烯片之间，整体呈现空心球形结构。详细的电化学研究表明，sn与sno2的摩尔比对电荷输运效率有很大影响。理论计算表明，SnS和sno2具有不同的功函数，且费米能级位移受SnS/ sno2摩尔比的影响，因此，当SnS/ sno2摩尔比接近1.0时，杂化物吸附的锂离子最多，比电荷转移动力学最高，离子扩散阻力最小。电化学测试表明，适当的复合材料具有最佳的锂存储性能（620和312.7 mAh g−1at 1 C和10 C）。在0.1 ℃下循环200次后，获得了850 mAh g−1的稳定和高可逆比容量。合适的纳米异质结构摩尔比和新型夹层空心球形复合材料结构是优异的电化学性能的重要原因。
Heterostructures have broad potential application in energy conversion material and optoelectronic device since of novel interface effect and enhanced electron transport dynamics at heterointerfaces. Herein, we report a heterostructured SnS/SnO2/spherical graphene composite, in which ultrafine SnS/SnO2nanoparticles with heterostructures are sandwiched between multi-layers of graphene sheets, exhibiting a hollow spherical architecture as a whole. Detailed electrochemical studies indicate that the molar ratio of SnS to SnO2has great influence on the charge transport efficiency. Theoretical calculation reveals that SnS and SnO2exhibit different work functions and the Fermi level shift is affected by the SnS/SnO2molar ratio, thus the hybrid with the ratio close to 1.0 owns the most adsorbed lithium ions, which leads to the highest specific charge-transfer kinetics and lowest ion-diffusion resistance than other samples. Electrochemical tests show that the composite with appropriate composition delivers the best lithium storage rate performance (620 and 312.7 mAh g−1at 1 C and 10 C). A much stable and high reversible specific capacity of 850 mAh g−1is obtained after 200 cycles at 0.1 C. The appropriate molar ratio of nano-heterostructures and the novel sandwich hollow spherical composite structure are attributed to the excellent electrochemical performances.
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影响因子：
8.6
作者：
Jiao, Zheng;Wang, Yong;Wu, Minghong;Lee, Jim Yang
通讯作者：
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通讯作者：
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DOI：
10.1039/c7cp07303h
发表时间：
2018-01
期刊：
Physical chemistry chemical physics : PCCP
影响因子：
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作者：
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影响因子：
8.6
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D. Aurbach;A. Nimberger;B. Markovsky;E. Levi;and Elena Sominski;A. Gedanken