采用两步法合成了1-磺酸丁基-3甲基咪唑硫酸氢盐([SO_3H-Bmim]HSO_4)酸性离子液体,对其红外光谱结构和电导率进行表征;同时采用不锈钢材料制作了燃料电池的壳体,并制备了阳极和阴极材料,与[SO_3H-Bmim]HSO_4电解质一起组装成燃料单电池...采用两步法合成了1-磺酸丁基-3甲基咪唑硫酸氢盐([SO_3H-Bmim]HSO_4)酸性离子液体,对其红外光谱结构和电导率进行表征;同时采用不锈钢材料制作了燃料电池的壳体,并制备了阳极和阴极材料,与[SO_3H-Bmim]HSO_4电解质一起组装成燃料单电池。以甲醇为燃料、空气为氧源在80℃采用伏安法测定了燃料电池的性能,其功率密度达到0.19 m W·cm^(-2),有望为甲醇燃料电池实际利用开辟新途径。展开更多
Significant progress has been made in the development of non-precious metal electrocatalysts （NPMEs） during the past decade. Correspondingly, there is an urgent demand for an appropriate measurement method to be est...Significant progress has been made in the development of non-precious metal electrocatalysts （NPMEs） during the past decade. Correspondingly, there is an urgent demand for an appropriate measurement method to be established for the reliable evaluation of NPMEs. In this study, platinum and graphite counter electrodes were used to investigate the impact of counter electrode material on the accelerated durability testing （ADT） of NPMEs in acidic medium. Platinum used as the coun- ter electrode in a traditional three-electrode electrochemical cell was found to dissolve in acidic medium and re-deposit on NPME coated on the working electrode during ADT. Such re-deposition causes the oxygen reduction reaction （ORR） performance of NPMEs to remarkably improve, and thus will seriously mislead our judgment of NPMEs if we are unaware of it. The phenomenon can be avoided using a graphite counter electrode.展开更多
To investigate dispersion mechanism of water-based ferrofluid, the effects of electrolytes on the dispersibility of ferrofluid in the dispersing system with different pH values were discussed. The ζ-potential of magn...To investigate dispersion mechanism of water-based ferrofluid, the effects of electrolytes on the dispersibility of ferrofluid in the dispersing system with different pH values were discussed. The ζ-potential of magnetic nano-particles was measured to discover the adsorbent state of oleate group on the surface of magnetite particles. The mechanism that coexisting electrolyte influences the dispersibility was studied. The results show that the electrolyte affects the stability of ferrofluid through an effect on the structure of surfactant bilayer adsorption, which was proved by ζ-potential measured. The associated mechanism of steric and electrostatic is dominant in aqueous ferrofluid.展开更多
文摘采用两步法合成了1-磺酸丁基-3甲基咪唑硫酸氢盐([SO_3H-Bmim]HSO_4)酸性离子液体,对其红外光谱结构和电导率进行表征;同时采用不锈钢材料制作了燃料电池的壳体,并制备了阳极和阴极材料,与[SO_3H-Bmim]HSO_4电解质一起组装成燃料单电池。以甲醇为燃料、空气为氧源在80℃采用伏安法测定了燃料电池的性能,其功率密度达到0.19 m W·cm^(-2),有望为甲醇燃料电池实际利用开辟新途径。
基金supported by the Fundamental Research Funds for the Central Universities(DUT15RC(3)001,DUT15ZD225)the Program for Liao-ning Excellent Talents in University(LR2015014)+1 种基金the Liaoning BaiQianWan Talents Program(201519)Dalian Excellent Young Scientific and Technological Talents(2015R006)
文摘Significant progress has been made in the development of non-precious metal electrocatalysts （NPMEs） during the past decade. Correspondingly, there is an urgent demand for an appropriate measurement method to be established for the reliable evaluation of NPMEs. In this study, platinum and graphite counter electrodes were used to investigate the impact of counter electrode material on the accelerated durability testing （ADT） of NPMEs in acidic medium. Platinum used as the coun- ter electrode in a traditional three-electrode electrochemical cell was found to dissolve in acidic medium and re-deposit on NPME coated on the working electrode during ADT. Such re-deposition causes the oxygen reduction reaction （ORR） performance of NPMEs to remarkably improve, and thus will seriously mislead our judgment of NPMEs if we are unaware of it. The phenomenon can be avoided using a graphite counter electrode.
基金Project(50374083) supported by the National Natural Science Foundation of ChinaProject(134375215) supported by the Research Fund for Postgraduate Innovation Project of Central South University, China
文摘To investigate dispersion mechanism of water-based ferrofluid, the effects of electrolytes on the dispersibility of ferrofluid in the dispersing system with different pH values were discussed. The ζ-potential of magnetic nano-particles was measured to discover the adsorbent state of oleate group on the surface of magnetite particles. The mechanism that coexisting electrolyte influences the dispersibility was studied. The results show that the electrolyte affects the stability of ferrofluid through an effect on the structure of surfactant bilayer adsorption, which was proved by ζ-potential measured. The associated mechanism of steric and electrostatic is dominant in aqueous ferrofluid.
