Facile Synthesis of Nitrogen-Doped Graphene鈥揢ltrathin MnO2 Sheet Composites and Their Electrochemical Performances

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• 作者：Shuhua Yang ; Xuefeng Song ; Peng Zhang ; Lian Gao
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：April 24, 2013
• 年：2013
• 卷：5
• 期：8
• 页码：3317-3322
• 全文大小：404K
• 年卷期：v.5,no.8(April 24, 2013)
• ISSN：1944-8252

文摘

Nitrogen-doped graphene鈥搖ltrathin MnO₂ sheet composites (NGMCs) were prepared through a one-step hydrothermal method at low temperature (120 掳C). Ultrathin MnO₂ sheets were well-dispersed and tightly anchored on graphene sheets, which were doped with nitrogen simultaneously. NGMCs electrode exhibited enhanced capacitive performances relative to those of undoped graphene-ultrathin MnO₂ sheets composites (GMCs). As the current density increased from 0.2 to 2 A/g, the capacitance of NGMCs still retained 74.9%, which was considerablely higher than that of GMCs (27%). Moreover, over 94.2% of the original capacitance was maintained after 2000 cycles, indicating a good cycle stability of NGMCs electrode materials.

Keywords:

nitrogen-doped graphene; ultrathin MnO₂ sheets; surface active sites; electrode materials; supercapacitors