Park Gi Dae, Kang Yun Chan
Department of Materials Science and Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713 (Korea).
Chemistry. 2015 Jun 15;21(25):9179-84. doi: 10.1002/chem.201500303. Epub 2015 May 14.
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.
采用两步喷雾干燥法制备了介孔氧化铜-还原氧化石墨烯（rGO）复合粉末。第一步，由三水合硝酸铜与柠檬酸的喷雾溶液制备中空氧化铜粉末，并进行湿磨以获得胶体喷雾溶液。第二步，对含有分散的氧化石墨烯（GO）纳米片的胶体溶液进行喷雾干燥，得到粒径为几微米的介孔氧化铜-rGO复合粉末。在300℃的后处理过程中，GO纳米片热还原为rGO纳米片。中空氧化铜、裸露的氧化铜聚集体以及氧化铜-rGO复合粉末在电流密度为2 A g⁻¹时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相应容量保持率分别为67%、48%和76%。由于rGO纳米片的存在，介孔氧化铜-rGO复合粉末具有高结构稳定性和高导电性，并表现出良好的循环和倍率性能。
