Superior Lithium‐Ion Storage Properties of Mesoporous CuO–Reduced Graphene Oxide Composite Powder Prepared by a Two‐Step Spray‐Drying Process. Issue 25 (14th May 2015)

• Record Type: Journal Article
• Authors: Park, Gi Dae; Kang, Yun Chan
• Is Part Of: Chemistry. Volume 21:Issue 25(2015)
• Page Start: 9179
• Page End: 9184
• Publication Date: 2015-05-14
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201500303
• Languages: English
• ISSNs: 0947-6539

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>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.</p> </abstract>