Superior Lithium-Ion Storage Properties of Mesoporous CuO-Reduced Graphene Oxide Composite Powder Prepared by a Two-Step Spray-Drying Process.
Superior Lithium-Ion Storage Properties of Mesoporous CuO-Reduced Graphene Oxide Composite Powder Prepared by a Two-Step Spray-Drying Process.
复制标题
DOI：
10.1002/chem.201500303
复制
发表时间：
2015-06
期刊：
影响因子：
--
通讯作者：
Gi Dae Park;Y. Kang
中科院分区：
文献类型：
--
作者：
Gi Dae Park;Y. Kang
采用两步喷雾干燥法制备了介孔CuO-还原氧化石墨烯（rGO）复合粉体。在第一步中，空心CuO粉末从硝酸铜三水合物与柠檬酸的喷雾溶液制备，并湿磨以获得胶体喷雾溶液。在第二步中，喷雾干燥含有分散的GO纳米片的胶体溶液产生具有几微米粒径的介孔CuO-rGO复合粉末。GO纳米片到rGO纳米片的热还原发生在300 °C下的后处理期间。空心CuO、裸CuO聚集体和CuO-rGO复合粉末在2 A g（-1）的电流密度下的初始放电容量分别为838、1145和1238 mA h g（-1）。它们在200次循环后的放电容量分别为259、380和676 mA h g（-1），从第二次循环开始测量的它们相应的容量保持率分别为67、48和76%。介孔CuO-rGO复合粉体具有高的结构稳定性和高的导电性，并表现出良好的循环性能和倍率性能。
Mesoporous CuO-reduced graphene oxide (rGO) composite powders were prepared by using a two-step spray-drying process. In the first step, hollow CuO powders were prepared from a spray solution of copper nitrate trihydrate with citric acid and were wet milled to obtain a colloidal spray solution. In the second step, spray drying of the colloidal solution that contained dispersed GO nanosheets produced mesoporous CuO-rGO composite powders with particle sizes of several microns. Thermal reduction of GO nanosheets to rGO nanosheets occurred during post-treatment at 300 °C. Initial discharge capacities of the hollow CuO, bare CuO aggregate, and CuO-rGO composite powders at a current density of 2 A g(-1) were 838, 1145, and 1238 mA h g(-1) , respectively. Their discharge capacities after 200 cycles were 259, 380, and 676 mA h g(-1) , respectively, and their corresponding capacity retentions measured from the second cycle were 67, 48, and 76 %, respectively. The mesoporous CuO-rGO composite powders have high structural stability and high conductivity because of the rGO nanosheets, and display good cycling and rate performances.