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Direct growth of MoS 2  nanowalls on vapor grown carbon nanofibers (VGCNFs) has been achieved using a microwave-assisted hydrothermal (MAH) method under an acidic condition. The acidic condition was obtained through the addition of an HCl aqueous solution. We demonstrate that the HCl not only modifies the pH value for limiting the growth rate but also leads to the formation of NaCl, which is the key for the direct and unique growth of MoS 2  on the VGCNF surface. A growth mechanism is therefore proposed. The growth of MoS 2  onto the high electrically conducting VGCNF creates a unique structure that not only reduces the aggregation of MoS 2  but also improves the electrical conductivity of the resulting composite electrode. The MoS 2  nanowall/VGCNF composite shows Csp as high as 248 F g −1  at 5 mV s −1  and excellent electrochemical stability with a retention of 96% after 1,000 cycles at a high charge rate of 200 mV s −1 . The ease of composite fabrication and electrochemical stability suggest that the MoS 2  nanowall/VGCNF composite is a promising candidate electrode material for supercapacitor.

Direct Growth of MoS2 Nanowalls on Carbon Nanofibers for Use in Supercapacitor