超薄ZnCoO纳米片在还原氧化石墨烯上的生长及其增强的锂存储性能

Gao Guoxin, Wu Hao Bin, Dong Bitao, Ding Shujiang, Lou Xiong Wen David

Department of Applied Chemistry School of Science Xi'an Jiaotong University Xi'an 710049 P. R. China; School of Chemical and Biomedical Engineering Nanyang Technological University 62 Nanyang Drive Singapore 637459.

School of Chemical and Biomedical Engineering Nanyang Technological University 62 Nanyang Drive Singapore 637459.

Adv Sci (Weinh). 2015 Jan 21;2(1-2):1400014. doi: 10.1002/advs.201400014. eCollection 2015 Feb.

The growth of ultrathin ZnCoO nanosheets on reduced graphene oxide (denoted as rGO/ZnCoO) via a facile low-temperature solution method combined with a subsequent annealing treatment is reported. With the assistance of citrate, interconnected ZnCoO nanosheets can assemble into hierarchically porous overlays on both sides of rGO sheets. Such a hybrid nanostructure would effectively faciliate the charge transport and accommodate volume variation upon prolonged charge/discharge cycling for reversible lithium storage. As a result, the rGO/ZnCoO nanocomposite manifests a very stable high reversible capacity of around 960 mAh g over 100 cycles at a low current density of 90 mA g and excellent rate capability.

报道了通过简便的低温溶液法结合后续退火处理在还原氧化石墨烯（记为rGO/ZnCoO）上生长超薄ZnCoO纳米片的过程。在柠檬酸盐的辅助下，相互连接的ZnCoO纳米片可以在rGO片的两侧组装成分层多孔覆盖层。这种混合纳米结构将有效地促进电荷传输，并在长时间的充放电循环中适应体积变化以实现可逆锂存储。结果，rGO/ZnCoO纳米复合材料在90 mA g的低电流密度下经过100次循环表现出约960 mAh g的非常稳定的高可逆容量以及优异的倍率性能。