Intercalation assembly of Li3VO4 nanoribbons/graphene sandwich-structured composites with enhanced oxygen reduction catalytic performance
Intercalation assembly of Li3VO4 nanoribbons/graphene sandwich-structured composites with enhanced oxygen reduction catalytic performance
复制标题
具有增强氧还原催化性能的Li3VO4纳米带/石墨烯夹层结构复合材料的插层组装
DOI：
10.1016/j.jallcom.2015.05.156
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发表时间：
2015-10-15
影响因子：
6.2
通讯作者：
Lei, Ming
中科院分区：
文献类型：
--
作者：
Huang, K.;Ling, Q. N.;Lei, Ming
采用简单的插层组装方法和热处理工艺，成功制备了新型层状Li 3VO 4纳米带和石墨烯片交替堆叠的纳米复合材料（LVO-G）。表征结果表明，Li 3VO 4纳米带的平均尺寸为几微米长、50-100 nm宽和几个原子层的高度，具有非层状晶体结构。石墨烯片的加入可以改变Li 3VO 4纳米带的择优取向，使其由（110）面向（011）面转变，同时抑制杂质相的生长。此外，交流阻抗分析也证实了LVO-G纳米复合材料的电阻降低，从而提高了导电性相比，裸露的Li 3VO 4纳米带。并通过循环伏安法（CV）、旋转圆盘电极（RDE）和计时电流法测试，进一步研究了这些新型LVO-G纳米复合材料在碱性溶液中对氧还原反应（ORR）的电催化性能。结果表明，LVO-G的活性和稳定性的提高主要是由于Li 3VO 4纳米带和石墨烯片之间的协同效应，LVO-G25的还原电流密度和起始电位值均比LVO-G50小。(C)2015 Elsevier B. V.版权所有。
Novel sandwich-like nanocomposites of alternative stacked ultrathin Li3VO4 nanoribbons and graphene sheets (LVO-G) were successfully developed by a facile intercalation assembly method with a post heating treatment. The characterization results demonstrate that the average size of the Li3VO4 nanoribbons with a non-layered crystal structure is a few micrometers in length, 50-100 nm in width and a few atomic layers in height. The addition of graphene sheets can modify the preferred orientation of the Li3VO4 nanoribbons from (110) to (011) plane and restrict the growth of impurity phase at the same time. In addition, EIS analysis has also verified the reduced resistance and thus the enhance conductivity of LVO-G nanocomposites compared with bare Li3VO4 nanoribbons. What's more, the electrocatalytic performances of these novel LVO-G nanocomposites for oxygen reduction reaction (ORR) in alkaline solution are further investigated by cyclic voltammetry (CV), rotating disk electrode (RDE) and chronoamperometry test. It is found that the enhanced activity and stability of LVO-G can be attributed to the synergistic effect between the Li3VO4 nanoribbons and graphene sheets with a larger reduction current density and a smaller onset potential value for LVO-G25 compared with LVO-G50 due to the change of components. (C) 2015 Elsevier B.V. All rights reserved.