In Situ Synthesis of Ni-BTC Metal-Organic Framework@Graphene Oxide Composites for High-Performance Supercapacitor Electrodes.

In response to serious ecological and environmental problems worldwide, a novel graphene oxide (GO) induction method for the in situ synthesis of GO/metal organic framework (MOF) composites (Ni-BTC@GO) for supercapacitors with excellent performance is presented in this study. For the synthesis of the composites, 1,3,5-benzenetricarboxylic acid (BTC) is used as an organic ligand due to its economic advantages. The optimum amount of GO is determined by a comprehensive analysis of morphological characteristics and electrochemical tests. 3D Ni-BTC@GO composites show a similar spatial structure to that of Ni-BTC, revealing that Ni-BTC could provide an effective framework and avoid GO aggregation. The Ni-BTC@GO composites have a more stable electrolyte-electrode interface and an improved electron transfer route than pristine GO and Ni-BTC. The synergistic effects of GO dispersion and Ni-BTC framework on electrochemical behavior are determined, where Ni-BTC@GO 2 achieves the best performance in energy storage performance. Based on the results, the maximum specific capacitance is 1199 F/g at 1 A/g. Ni-BTC@GO 2 has an excellent cycling stability of 84.47% after 5000 cycles at 10 A/g. Moreover, the assembled asymmetric capacitor exhibits an energy density of 40.89 Wh/kg at 800 W/kg, and it still remains at 24.44 Wh/kg at 7998 W/kg. This material is expected to contribute to the design of excellent GO-based supercapacitor electrodes.

Molecular characterization of a new human echovirus 11 isolate associated with severe hand, foot and mouth disease in Yunnan, China, in 2010.

Human echovirus 11 (E-11), a member of the species Enterovirus B, frequently causes aseptic meningitis and hand, foot and mouth disease (HFMD). We determined the complete genome sequence of strain 520K/YN/CHN/2010, isolated from a subject with HFMD and aseptic meningitis in Yunnan Province, China, in 2010. The strain shared 78.8% and 81.1% nucleotide sequence similarity with prototype strain Gregory in the complete VP1 gene and the complete genome, respectively. Only the VP2-VP3-VP1 genome region of 520K/YN/CHN/2010 was similar to that of the E-11 strain; the other genome regions were most similar to those of other members of the species Enterovirus B. Using phylogenetic analysis and sequence comparisons of the complete VP1 gene, E-11 strains could be divided into five genogroups, and the 520K/YN/CHN/2010 strain was found to belong to genogroup A. Recombination analysis showed evidence of recombination with other member of the species Enterovirus B, especially the E-9 strain MSH/KM812/2010. Persistent surveillance of HFMD pathogens might help predict potential emerging viruses and related disease outbreaks.