The adsorption behavior of butyl xanthate on the surface of lead oxide was investigated using continuous online in situ attenuated total reflectance Fourier transform infrared（ATR-FTIR） spectroscopy technique and tw...The adsorption behavior of butyl xanthate on the surface of lead oxide was investigated using continuous online in situ attenuated total reflectance Fourier transform infrared（ATR-FTIR） spectroscopy technique and two dimensional（2D） correlation analysis.The adsorbed layer studied was prepared by coating α-PbO particles onto the surfaces of the ZnSe crystal.The appearance of spectral peaks at 1203 cm^-1,1033 cm^-1 and their red shift indicated the formation and aggregation of xanthate at the surface of α-PbO.According to 1R intensity changes after rinsing with deionized water and a NaOH solution,the adsorption was proved to be a chemisorption type.The competition between xanthate and OH^- for the surfaces leads to desorption of xanthate at higher pH.The technique of 2D correlation ATR-FTIR spectroscopy was used to evaluate the changing order of spectral intensities in the adsorption process,and the results indicated that xanthate micelles were formed at the surfaces.The adsorption kinetics of butyl xanthate was found to be a pseudo-second-order reaction model and the adsorption capacity of butyl xanthate at α-PbO was as high as 281 mg g^-1 after 150 min.展开更多
Al/α-PbO2/β-PbO2 composite electrodes doped with rare earth oxide （CeO2） were prepared by anodic oxidation method investigate the influence of nano-CeO2 dopants on the properties of Al/α-PbO2/β-PbO2-CeO2 electro...Al/α-PbO2/β-PbO2 composite electrodes doped with rare earth oxide （CeO2） were prepared by anodic oxidation method investigate the influence of nano-CeO2 dopants on the properties of Al/α-PbO2/β-PbO2-CeO2 electrodes and the impact of α-PbO2 as the intermediate layer. The results show that using α-PbO2 as the intermediate layer will benefit the crystallization of β-PbO2 and β-PbO2 is more suitable as the surface layer than α-PbO2. CeO2 dopants change the crystallite size and crystal structure, enhance the catalytic activity, and even change the deposition mechanism of PbO2. The doping of CeO2 in the PbO2 electrodes can enhance the electro-catalytic activity, which is helpful for oxygen evolution, and therefore reduce the cell voltage.展开更多
阀控式铅酸蓄电池的安全可靠性高,成本低,但其循环寿命短。以4BS晶种用作电池正极添加剂,可显著提高电池的放电容量和循环寿命。笔者在12 V 2.3 Ah电池的正极板铅膏配方中添加4BS晶种(4BS晶种在铅膏所占质量分数为1%),使其1C高倍率放电...阀控式铅酸蓄电池的安全可靠性高,成本低,但其循环寿命短。以4BS晶种用作电池正极添加剂,可显著提高电池的放电容量和循环寿命。笔者在12 V 2.3 Ah电池的正极板铅膏配方中添加4BS晶种(4BS晶种在铅膏所占质量分数为1%),使其1C高倍率放电性能提高4.2%,循环寿命也得到延长。添加4BS晶种的正极板以α-PbO2形成的多孔骨架混合结构为主,更加利于H+、SO42-和水分子的迁移。电池充放电循环时,正极板发生α-PbO2先转化成PbSO4,再到β-PbO2的演变过程。电池循环寿命失效,本质上是正极活性物质(PAM)的多孔骨架结构逐渐消失,伴有不可逆硫酸盐化,导致板栅腐蚀、内阻增大、寿命终止。展开更多
基金supported by the National Natural Science Foundation of China(251178283,20905055)the Six-Field Talent Peak Program of Jiangsu Provinceand the Graduate Research and Innovation Plan of Jiangsu Province(SJLX_0580)~~
基金supported by the National Nature Science Foundation of China(Nos.51274104,50874052)National Key Basic Research Program of China(973,No.2011CB933700)
文摘The adsorption behavior of butyl xanthate on the surface of lead oxide was investigated using continuous online in situ attenuated total reflectance Fourier transform infrared（ATR-FTIR） spectroscopy technique and two dimensional（2D） correlation analysis.The adsorbed layer studied was prepared by coating α-PbO particles onto the surfaces of the ZnSe crystal.The appearance of spectral peaks at 1203 cm^-1,1033 cm^-1 and their red shift indicated the formation and aggregation of xanthate at the surface of α-PbO.According to 1R intensity changes after rinsing with deionized water and a NaOH solution,the adsorption was proved to be a chemisorption type.The competition between xanthate and OH^- for the surfaces leads to desorption of xanthate at higher pH.The technique of 2D correlation ATR-FTIR spectroscopy was used to evaluate the changing order of spectral intensities in the adsorption process,and the results indicated that xanthate micelles were formed at the surfaces.The adsorption kinetics of butyl xanthate was found to be a pseudo-second-order reaction model and the adsorption capacity of butyl xanthate at α-PbO was as high as 281 mg g^-1 after 150 min.
基金Project(50964008)supported by the National Natural Science Foundation of ChinaProject(2010287)supported by Analysis and Testing Foundation of Kunming University of Science and Technology,China
文摘Al/α-PbO2/β-PbO2 composite electrodes doped with rare earth oxide （CeO2） were prepared by anodic oxidation method investigate the influence of nano-CeO2 dopants on the properties of Al/α-PbO2/β-PbO2-CeO2 electrodes and the impact of α-PbO2 as the intermediate layer. The results show that using α-PbO2 as the intermediate layer will benefit the crystallization of β-PbO2 and β-PbO2 is more suitable as the surface layer than α-PbO2. CeO2 dopants change the crystallite size and crystal structure, enhance the catalytic activity, and even change the deposition mechanism of PbO2. The doping of CeO2 in the PbO2 electrodes can enhance the electro-catalytic activity, which is helpful for oxygen evolution, and therefore reduce the cell voltage.
文摘阀控式铅酸蓄电池的安全可靠性高,成本低,但其循环寿命短。以4BS晶种用作电池正极添加剂,可显著提高电池的放电容量和循环寿命。笔者在12 V 2.3 Ah电池的正极板铅膏配方中添加4BS晶种(4BS晶种在铅膏所占质量分数为1%),使其1C高倍率放电性能提高4.2%,循环寿命也得到延长。添加4BS晶种的正极板以α-PbO2形成的多孔骨架混合结构为主,更加利于H+、SO42-和水分子的迁移。电池充放电循环时,正极板发生α-PbO2先转化成PbSO4,再到β-PbO2的演变过程。电池循环寿命失效,本质上是正极活性物质(PAM)的多孔骨架结构逐渐消失,伴有不可逆硫酸盐化,导致板栅腐蚀、内阻增大、寿命终止。
