Variation of wind speed and the physico-chemical parameters,such as dissolved phosphate,ferrous and manganese in lake water were observed on site.Together with the chemistry analysis and simulated experiment in lab,th...Variation of wind speed and the physico-chemical parameters,such as dissolved phosphate,ferrous and manganese in lake water were observed on site.Together with the chemistry analysis and simulated experiment in lab,the change of phosphate concentration in lake water was analyzed.The variation of ferrous/phosphate ratio explained that along with the enhancement of wind-wave effect and the oxidation ability of lake water,the effects of co-precipitation and removal of dissolved phosphate and iron in the lake water were reinforced.The ferrous/phosphate ratio in pore water was less than 2.0,demonstrating that the dissolved phosphate can be released into the overlying water.But,in the lake water,the stability of phosphate was controlled by the water dynamics.The phosphate release experiment showed that molecular release was only part of the whole and the direct discharge of phosphate in the pore water was also a part.The mineralization and biological process of suspended particulates in the water may be another important reason for the whole phosphate loadings.展开更多
Flower-like Ni3P2O8 and flower-like Fe3P2O8 center dot 8H(2)O have been successfully synthesized by a simple chemical precipitation method. X-ray diffraction (XRD) patterns reveal an amorphous phase formation of nicke...Flower-like Ni3P2O8 and flower-like Fe3P2O8 center dot 8H(2)O have been successfully synthesized by a simple chemical precipitation method. X-ray diffraction (XRD) patterns reveal an amorphous phase formation of nickel phosphate (Ni3P2O8) and pure monoclinic phase of Fe3P2O8 center dot 8H(2)O. The novel flower-like Ni3P2O8 and flower-like Fe3P2O8 center dot 8H(2)O when used for supercapacitor electrode materials exhibit a high specific capacitance (C-m) of 1464 F/g and 200 F/g at a current density of 0.5 A/g, respectively. Eventually, an asymmetric supercapacitor is fabricated using Ni3P2O8 as positive electrode and Fe3P2O8 center dot 8H(2)O as negative electrode. A high specific capacitance of 94 F/g is achieved in the high-voltage region of 0 similar to 1.6V, and a large energy density of 32.6 Wh/kg is delivered at power density of 420 W/kg. The findings demonstrate the important and great potential of developing metal phosphate based materials for supercapacitors. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.展开更多
基金supported by the Knowledge Innovation Project of the Chinese Academy of Sciences(Grant No.KZCX1-SW-12)the National Natural Science Foundation of China(Grant No.40501064)the State Key Project of Science and Technology in"Tenth Five-Year Plan"of China,"863"(Grant No.2002AA601013).
文摘Variation of wind speed and the physico-chemical parameters,such as dissolved phosphate,ferrous and manganese in lake water were observed on site.Together with the chemistry analysis and simulated experiment in lab,the change of phosphate concentration in lake water was analyzed.The variation of ferrous/phosphate ratio explained that along with the enhancement of wind-wave effect and the oxidation ability of lake water,the effects of co-precipitation and removal of dissolved phosphate and iron in the lake water were reinforced.The ferrous/phosphate ratio in pore water was less than 2.0,demonstrating that the dissolved phosphate can be released into the overlying water.But,in the lake water,the stability of phosphate was controlled by the water dynamics.The phosphate release experiment showed that molecular release was only part of the whole and the direct discharge of phosphate in the pore water was also a part.The mineralization and biological process of suspended particulates in the water may be another important reason for the whole phosphate loadings.
基金supported by the National Natural Science Foundation of China(No.21403099)the Natural Science Foundation of Gansu Province(No.145RJZA193)the fund of the State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology Funder not found in database.Please check!(No.SKLAB02014005)
文摘Flower-like Ni3P2O8 and flower-like Fe3P2O8 center dot 8H(2)O have been successfully synthesized by a simple chemical precipitation method. X-ray diffraction (XRD) patterns reveal an amorphous phase formation of nickel phosphate (Ni3P2O8) and pure monoclinic phase of Fe3P2O8 center dot 8H(2)O. The novel flower-like Ni3P2O8 and flower-like Fe3P2O8 center dot 8H(2)O when used for supercapacitor electrode materials exhibit a high specific capacitance (C-m) of 1464 F/g and 200 F/g at a current density of 0.5 A/g, respectively. Eventually, an asymmetric supercapacitor is fabricated using Ni3P2O8 as positive electrode and Fe3P2O8 center dot 8H(2)O as negative electrode. A high specific capacitance of 94 F/g is achieved in the high-voltage region of 0 similar to 1.6V, and a large energy density of 32.6 Wh/kg is delivered at power density of 420 W/kg. The findings demonstrate the important and great potential of developing metal phosphate based materials for supercapacitors. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
