RESUMEN
As a major factor in determining performances of the electrochemical super capacitor, electrode materials have received wide attentions recently. Bacteria, with their advantages of low cost, abundance, environmental protection and easy to get from nature, have become the promising biomaterials. The composite electrode materials based on bacteria or their related products, have the advantages of large specific surface area, good cycle stability and high capacitance, and become the research focus in the field of super capacitor electrode materials. Herein, the characteristics and related technology of different bacteria on the preparation of electrode materials for super capacitor were summarized. This review systematically elaborates the latest research progress of bacterial composite electrode materials. Moreover, the prospect of super capacitors has been discussed.
RESUMEN
A new method for determination of trace Cu, Cr, Mn, Co, Ni, Cd, Fe and Pb impurities in high pure tin oxide material was proposed. 0. 1 g of sample was successfully digested at 230℃ in 3 h when autoclaves with high pressure and high temperature were used. After that, over 99. 9% of the matrix Sn was removed by chloride volatilization at 150℃ for 1. 5 h, which eliminated the matrix effect and spectra interference in the following ICP-MS detection. The recoveries for all the analytes of the spiked test were 100%±5%, the RSDs for 6 runs of sample analysis were from 0. 09% to 3. 68%, and the limits of detection (LOD, 3σ) were from 0. 002 mg/kg to 0. 034 mg/kg, which indicated that the established method were of both accuracy and high sensitivity, and could be applied for the analysis of samples with purity up to 6N. Finally, three samples specified with 4N purity were analyzed by this method.