Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology , Taiyuan 030024, China.
ACS Appl Mater Interfaces. 2017 May 10;9(18):15484-15491. doi: 10.1021/acsami.7b02394. Epub 2017 Apr 27.
Ultrafine SnS nanocrystals-reduced graphene oxide nanoribbon paper (SnS-RGONRP) has been created by a well-designed process including in situ reduction, evaporation-induced self-assembly, and sulfuration. The as-formed SnS nanocrystals possess an average diameter of 2.3 nm and disperse on the surface of RGONRs uniformly. The strong capillary force formed during evaporation leads to a compact assembly of RGONRs to give a flexible paper structure with a high density of 0.94 g cm. The as-prepared SnS-RGONRP composite could be directly used as free-standing electrode for sodium ion batteries. Due to the synergistic effects between the ultrafine SnS nanocrystals and the conductive, tightly connected RGONR networks, the composite paper electrode exhibits excellent electrochemical performance. A high volumetric capacity of 508-244 mAh cm was obtained at current densities in the range of 0.1-10 A g. Discharge capacities of 334 and 255 mAh cm were still kept, even after 1500 cycles tested at current densities of 1 and 5 A g, respectively. This strategy provides insight into a new pathway for the creation of free-standing composite electrodes used in the energy storage and conversion.
通过包括原位还原、蒸发诱导自组装和硫化在内的精心设计的过程，制备了超细 SnS 纳米晶-还原氧化石墨烯纳米带纸（SnS-RGONRP）。形成的 SnS 纳米晶具有平均直径为 2.3nm，并均匀分散在 RGONRs 的表面上。蒸发过程中形成的强毛细力导致 RGONRs 紧密组装，赋予了具有高密度（0.94gcm）的柔性纸张结构。所制备的 SnS-RGONRP 复合材料可直接用作钠离子电池的独立电极。由于超细 SnS 纳米晶和导电、紧密连接的 RGONR 网络之间的协同效应，复合纸电极表现出优异的电化学性能。在 0.1-10Ag 的电流密度范围内，获得了 508-244mAhcm 的高体积容量。即使在 1 和 5Ag 的电流密度下分别经过 1500 次循环测试后，仍保持 334 和 255mAhcm 的放电容量。该策略为储能和转换用独立复合电极的制备提供了新的思路。
