Dual Carbon-Supported ZnO/CuO Nanocomposites as an Anode with Improved Performance for Li-Ion Batteries
Chunhua Zhao, Chunhua Zhao, Jingtao Fan, Jingjia Guo, Xu Zhang, Muhammad Jahanzaib, Zongchao Zhao, Wenbing Jiang, Lulu Song, Chongjun Zhao, Chongjun Zhao
Abstract
Carbon-coated ZnO/CuO nanoparticles anchored on reduced graphene oxide (ZnO/CuO/C/G) are constructed by using the redox reaction of elementary Cu in metal–organic framework-derived ZnO/Cu/C and graphene oxide (GO). The redox reaction endows a strong interaction between the resulting ZnO/CuO/C and reduced graphene oxide and thus produces a good contact and porous structure. Dual carbons of MOF-derived carbon and reduced graphene oxide supply the support for individual particles and connect them as a whole, which facilitate the electrochemical cycle and rate performance of ZnO/CuO/C/G: Even after 250 cycles, the specific capacity remains 594.6 mAh g–1 at 1.0 A g–1, which is 105.7% of that at the fifth cycle. Moreover, 410 mAh g–1 at 2.0 A g–1 is obtained (vs 760 mAh g–1 at 0.1 A g–1).