Nanoscale Chevrel Mo6S8 powders are synthesized by molten salt synthesis. Synthesized Mo6S8 powders have different mean particle sizes which are dependent on a ratio of salt to precursor. The particle sizes of Mo6S8 powders changes along with the ratio increase. Mo6S8 (6:1) demonstrates the best electrochemical characteristics among the synthesized Mo6S8 powders although the Mo6S8 (4:1) has the smallest particle size. Mo6S8 (6:1) shows a reversible capacity of 83.9 mAhg −1 , which is 27.5% and 33% improved value over Mo6S8 (2:1) and Mo6S8 (4:1) at a current density of 0.2C, respectively. The superior electrochemical properties of Mo6S8 (6:1) are attributed to the balanced particle size which provides proper contact area with electrolyte and the shortened Mg 2+ diffusion length. The Mo6S8 (4:1) has the smallest particle size but further reduction of particle size from Mo6S8 (6:1) is not advantageous.
Spatio-temporal variations of biochemical oxygen demand (BOD) and total coliform (TC) in the Han River, Korea, were investigated in terms of concentration-based and mass loading-based approaches. Considering the river water quality criteria regulated by the Ministry of Environment in Korea, the tributaries linked to the mainstream of the Han River were found to be highly contaminated with respect to both BOD and TC and, in fact, most of the tributaries exceeded the maximum water quality criteria. To evaluate the pollution impact of tributaries on the mainstream, the monthly water quality monitoring data for six years (from 1995 to 2000) were collected from the Han River basin, and statistically analyzed using Pearson's correlation coefficient. The results revealed that mass loading-based approach was superior to the concentration-based approach for effective Han River watershed management. Overall results supported that the mass loading-based approach associated with total maximum daily loads (TMDL) management would be a useful and suitable protocol in watershed management for improving the water quality of the Han River and protecting public health. Therefore, this study supporting TMDL management can be applicable to a wide array of contaminants and watershed settings in Korea.
Magnesium (Mg) deposition and dissolution behaviors of 0.2 M MgBu 2-(AlCl 2 Et) 2 , 0.5 M Mg(ClO 4) 2 , and 0.4 M (PhMgCl) 2-AlCl 3-based electrolytes with and without tris(pentafluorophenyl) borane (TPFPB) are investigated by ex situ scanning electron microscopy (SEM) and galvanostatic cycling of Mg/copper (Cu) cells. To ascertain the factors responsible for the anodic stability of the electrolytes, linear sweep voltammogrametry (LSV) experiments for various electrolytes and solvents are conducted. The effects of TPFPB as an additive on the anodic stability of 0.4 M (PhMgCl) 2-AlCl 3 /THF electrolyte are also discussed.
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