Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 8, Pages 3317-3322Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am400385g
Keywords
nitrogen-doped graphene; ultrathin MnO2 sheets; surface active sites; electrode materials; supercapacitors
Funding
- Shanghai Municipal Natural Science Foundation [12ZR1414300]
- National Natural Science Foundation of China [51172142]
- Starting Foundation for New Teacher of Shanghai Jiao Tong University [12 X 100040119]
- Third Phase of 211 Project for Advanced Materials Science [WS3116205007]
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Nitrogen-doped graphene-ultrathin MnO2 sheet composites (NGMCs) were prepared through a one-step hydrothermal method at low temperature (120 degrees 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 similar to 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.
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