Work

High–rate electrochemical capacitors from highly graphitic carbon–tipped manganese oxide/mesoporous carbon/manganese oxide hybrid nanowires

Year: 2011

Type: article

Abstract: In this paper, using manganese oxide as an example, we report the successful design and synthesis of a novel one-dimensional highly graphitic carbon-tipped manganese oxide/mesoporous carbon/manganese oxide hybrid nanowire. The unique structure significantly improves the conductivity of metal oxide materials, which is a key limitation in pseudocapacitors. The hybrid nanowire with optimal carbon content, when applied as an electrode, exhibits superior capacitive properties in 1 M Na2SO4 aqueous solution, such as high specific capacitance (266 F g−1 at 1 A g−1), excellent rate capability (56.4% capacity retention at 60 A g−1) and outstanding cycling stability (without degradation after 1200 cycles). The energy densities achieved can be as high as 20.8 W h kg−1, at a power density of 30 kW kg−1. The results demonstrated that the manganese oxide in our hybrid nanomaterial was efficiently utilized with the assistance of the highly conductive graphitic carbon-tipped mesoporous carbon shell. It is reckoned that the present low-cost novel hybrid nanowire can serve as a promising electrode material for supercapacitors and other electrochemical devices.

Source: Energy & Environmental Science

DOI: 10.1039/c1ee01032h

Authors: Hao Jiang, Liping Yang, Chunzhong Li, Chaoyi Yan, Pooi See Lee, Jan Ma

Institutions: East China University of Science and Technology, Nanyang Technological University, Temasek Laboratories, Temasek Laboratories@NTU

Language: English

Topic: Supercapacitor Materials and Fabrication

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: bronze

Funders: National Natural Science Foundation of China, Program of Shanghai Subject Chief Scientist