Photocatalytic Synthesis of TiO2 and Reduced Graphene Oxide Nanocomposite for Lithium Ion Battery
Photocatalytic Synthesis of TiO2 and Reduced Graphene Oxide Nanocomposite for Lithium Ion Battery
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DOI：
10.1021/am300722d
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发表时间：
2012-07-01
影响因子：
9.5
通讯作者：
Zhang, Shanqing
中科院分区：
文献类型：
--
作者：
Qiu, Jingxia;Zhang, Peng;Zhang, Shanqing
在这项工作中，我们使用改进的Hummers氧化法合成了氧化石墨烯（GO）。TiO2纳米粒子可以通过氧化石墨烯片上丰富的含氧官能团（如环氧基、羟基、羰基和羧基）锚定在氧化石墨烯片上。使用TiO2光催化剂，在紫外光照射下对氧化石墨烯进行光催化还原，制备出TiO2- rgo纳米复合材料。将制备的TiO2、TiO2- go和TiO2- rgo纳米复合材料作为活性负极材料制备锂离子电池（LIBs），并对其相应的锂离子插入/提取性能进行了评价。与纯TiO2和纯TiO2- go样品相比，TiO2- rgo纳米复合材料制备的LIBs具有更稳定的循环性能、更大的可逆容量和更好的倍率性能。电化学和材料表征表明，石墨烯网络为电子转移提供了有效的途径，而TiO2纳米颗粒阻止了石墨烯纳米片的重新堆积，从而分别提高了电导率和比容量。这项工作表明，TiO2基光催化方法可能是一种简单、低成本、高效的大规模生产锂离子电池负极材料的方法。
In this work, we synthesized graphene oxide (GO) using the improved Hummers oxidation method. TiO2 nanoparticles can be anchored on the GO sheets via the abundant oxygen containing functional groups such as epoxy, hydroxyl, carbonyl, and carboxyl groups on the GO sheets. Using the TiO2 photocatalyst, the GO was photocatalytically reduced under UV illumination, leading to the production of TiO2-reduced graphene oxide (TiO2-RGO) nanocomposite. The as prepared TiO2, TiO2-GO, and TiO2-RGO nanocomposite were used to fabricate lithium ion batteries (LIBs) as the active anode materials and their corresponding lithium ion insertion/extraction performance was evaluated The resultant LIBs of the TiO2-RGO nanocomposite possesses more stable cyclic performance, larger reversible capacity, and better rate capability, compared with that of the pure TiO2 and TiO2-GO samples. The electrochemical and materials characterization suggest that the graphene network provides efficient pathways for electron transfer, and the TiO2 nanoparticles prevent the restacking of the graphene nanosheets, resulting in the improvement in both electric conductivity and specific capacity, respectively. This work suggests that the TiO2 based photocatalytic method could be a simple, low-cost, and efficient approach for large-scale production of anode materials for lithium ion batteries.