Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 3, Issue 12, Pages 3205-3213Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.5b00791
Keywords
Graphene oxide; Graphenothermal reduction; Exfoliated graphene oxide; MnO; Anode; Li-ion batteries
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Funding
- Ministry of Minority Affairs, Government of India at University of Hyderabad through the MANF [F1-17.1/2011/MANF-MUS-AND-213/(SA-III/Website)]
- National University of Singapore through India research initiative (NUS-IRI) fund [R069000006646]
- National Research Foundation, Prime Minister's Office, Singapore under its Competitive Research Programme (CRP Award) [NRF-CRP 8-2011-4]
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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 similar to 82 m(2) g(-1) and an average pore size of similar to 12 nm. As an anode in lithium-ion batteries, the EG/MnO composite shows a high reversible capacity of 936 mAh g(-1) at a current rate of 75 nnA g(-1). Capacity retention of similar to 84% (784 mAh g(-1)) is observed even at the 100th cycle which corresponds to a Coulombic efficiency of similar to 99%. 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.
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