Sustainable Graphenothermal Reduction Chemistry to Obtain MnO Nanonetwork Supported Exfoliated Graphene Oxide Composite and its Electrochemical Characteristics

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• 作者：Shaikshavali Petnikota ; Vadali V. S. S. Srikanth ; P. Nithyadharseni ; M. V. Reddy ; S. Adams ; B. V. R. Chowdari
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2015
• 出版时间：December 7, 2015
• 年：2015
• 卷：3
• 期：12
• 页码：3205-3213
• 全文大小：690K
• ISSN：2168-0485

文摘

Exfoliated graphene oxide (EG)/manganese(II) oxide (MnO) composite powder is synthesized by simple solid state graphenothermal reduction process. Structural, chemical, and morphological studies confirm the formation of EG/MnO composite in which cubic MnO crystallites are found to anchor onto EG surfaces. The as-synthesized EG/MnO composite is constituted with 65 and 35 wt % of MnO and EG, respectively. The EG/MnO composite exhibits a specific surface area of 鈭?2 m² g^鈥? and an average pore size of 鈭?2 nm. As an anode in lithium-ion batteries, the EG/MnO composite shows a high reversible capacity of 936 mAh g^鈥? at a current rate of 75 mA g^鈥?. Capacity retention of 鈭?4% (784 mAh g^鈥?) is observed even at the 100th cycle which corresponds to a Coulombic efficiency of 鈭?9%. Cyclic voltammetry studies on the composite show that Li storage is owing to reversible conversion reactions of MnO and electrochemical absorption/desorption by EG. Electrochemical impedance spectroscopy studies clearly show easy lithiation kinetics. Owing to the electrochemical performance of EG/MnO composite and its easy, reproducible, and scalable synthesis procedure, it is an excellent addition to this class of similar materials.