期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 1, 页码 669-+出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b04176
关键词
Electrodeposition; Carbon fibers; AgCNT; MnO2; Supercapacitor
资金
- Ministry of Science and Technology of Taiwan [104-2113-M-005-011-MY3, 107-2113-M-005-008-, 107-2622-M-005-001-CC2, 106-2627-M-005-001-, 107-2627-M-005-001-]
Large-scale ultrathin gamma-MnO2 nanosheets form a continuous wall-like enclosed network directly grown onto the surface of carbon cloth (CC) fibers. In a simple green electrochemical deposition process, the CCs were pretreated under acid condition and subsequently attached by carbon nanotubes with silver nanoparticles (AgCNTs), forming a three-dimensional (3D) hierarchical heterostructure of MnO2-decorated AgCNT CC fibers (MnO2-AgCNT-CC). The structure, phase purity, and morphology of the samples were characterized by field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Raman spectroscopy, Xray photoelectron spectroscopy (XPS), and electrochemical techniques. The MnO2-AgCNT-CC composite had high specific capacitance (up to 32S F/g at 1 A/g) and long cycle-life stability. These outstanding electrochemical characteristics were attributed to the unique 3D porous MnO2 nanowalls and AgCNT composites, increasing ion-accessible surface area and shortening cation/electron transportation pathways, thus endowing the electrode with carbon fibers with good capability and long-term cycling stability, lucrative for large-scale energy storage applications. The simplicity of the developed fabrication process is appealing to the large-scale production of MnO2-based materials on commercial CC fibers and for adaptation to roll-to-roll manufacturing through a continuous-fabrication process, widening its applicability.
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