The electrochemical characteristics of Ta2O5-IrO2 electrodes prepared from different chemical compositions and coating methods were observed by using cyclic voltammetry, potentiostatic polarization, galvanostatic pola...The electrochemical characteristics of Ta2O5-IrO2 electrodes prepared from different chemical compositions and coating methods were observed by using cyclic voltammetry, potentiostatic polarization, galvanostatic polarization and scanning electron microscopy. The efficiency for chloride oxidation and oxygen evolution processes was not only influenced by the chemical composition but also by the surface morphology of the oxide electrode which was susceptible to the ratio of the two components and the coating method. Ta2O5(50)-IrO2(50) electrodes revealed the highest catalytic activity for the chloride ion oxidation and oxygen evolution reaction because they had the largest effective surface area. The durability of the oxide electrodes in the accelerated life tests was improved as the thickness of the oxide layer increased and the ratio of [IrO2] to [Ta2O5] approached 80/20.展开更多
The preparation process and properties of the thermally prepared Ti anodes coated with IrO2+Ta2O5 was studied. The structure and morphologies of the IrO2+Ta2O5 coatings were determined by XRD and SEM. Their electroche...The preparation process and properties of the thermally prepared Ti anodes coated with IrO2+Ta2O5 was studied. The structure and morphologies of the IrO2+Ta2O5 coatings were determined by XRD and SEM. Their electrochemical properties were studied by polarization curve and cyclic voltammetry. Trivalent chromium electroplating using Ti/IrO2+Ta2O5 anodes is carried out and the results were analyzed. Results show that this anode exhibits excellent electrochemical activity and stability in sulfate electrolysis. The electrocatalytic activity is determined not only by the content of IrO2 but also the structure and morphology of the anode coatings. The electroplating results indicats that Ti/IrO2+Ta2O5 anodes have excellent capabilities and merits in improving the stability of trivalent chromium electroplating in sulfate system.展开更多
In this work,a flake-structured Co2B2O5 material was obtained by a simple sol-gel method and researched for use in sodium ion batteries firstly.When serving as anode material for sodium ion batteries,it exhibits the h...In this work,a flake-structured Co2B2O5 material was obtained by a simple sol-gel method and researched for use in sodium ion batteries firstly.When serving as anode material for sodium ion batteries,it exhibits the high initial reversible capacity of 466 mAh·g-1 at a current density of 100 mA·g-1.Through the recombination of carbon nanotubes(CNTs),the composite Co2B2O5/CNTs delivers the initial reversible capacity of 464 mAh·g-1,and324 mAh·g-1 is obtained after 60 cycles under the current density of 100 mA·g-1.When under the current density of 1000 mA·g-1,a capacity of 236 mAh·g-1 is obtained for Co2B2O5/CNTs while 160 mAh·g-1 for Co2B2O5.Moreover,the sodium storage behavior of Co2B2O5 is identified by kinetic analysis.The higher Na+capacitive contribution of Co2B2O5/CNTs could account for the enhanced rate performance.The results indicate that Co2B2O5 is a promising anode material for sodium ion batteries.展开更多
Nb_2O_5/C nanosheets are successfully prepared through a mixing process and followed by heating treatment.Such Nb_2O_5/C based electrode exhibits high rate performance and remarkable cycling ability,showing a high and...Nb_2O_5/C nanosheets are successfully prepared through a mixing process and followed by heating treatment.Such Nb_2O_5/C based electrode exhibits high rate performance and remarkable cycling ability,showing a high and stable specific capacity of ~380mAhg^（-1） at the current density of 50 mAg^（-1）（much higher than the theoretical capacity of Nb_2O_5）.Further more,at a current density of 500mAg^（-1）,the nanocomposites electrode still exhibits a specific capacity of above 150 mAh g^（-1） after 100 cycles.These results suggest the Nb_2O_5/C nanocomposite is a high performance anode material for lithium-ion batteries.展开更多
文摘The electrochemical characteristics of Ta2O5-IrO2 electrodes prepared from different chemical compositions and coating methods were observed by using cyclic voltammetry, potentiostatic polarization, galvanostatic polarization and scanning electron microscopy. The efficiency for chloride oxidation and oxygen evolution processes was not only influenced by the chemical composition but also by the surface morphology of the oxide electrode which was susceptible to the ratio of the two components and the coating method. Ta2O5(50)-IrO2(50) electrodes revealed the highest catalytic activity for the chloride ion oxidation and oxygen evolution reaction because they had the largest effective surface area. The durability of the oxide electrodes in the accelerated life tests was improved as the thickness of the oxide layer increased and the ratio of [IrO2] to [Ta2O5] approached 80/20.
文摘The preparation process and properties of the thermally prepared Ti anodes coated with IrO2+Ta2O5 was studied. The structure and morphologies of the IrO2+Ta2O5 coatings were determined by XRD and SEM. Their electrochemical properties were studied by polarization curve and cyclic voltammetry. Trivalent chromium electroplating using Ti/IrO2+Ta2O5 anodes is carried out and the results were analyzed. Results show that this anode exhibits excellent electrochemical activity and stability in sulfate electrolysis. The electrocatalytic activity is determined not only by the content of IrO2 but also the structure and morphology of the anode coatings. The electroplating results indicats that Ti/IrO2+Ta2O5 anodes have excellent capabilities and merits in improving the stability of trivalent chromium electroplating in sulfate system.
基金financially supported by the National Natural Science Foundation of China(No.21673136)the Science and Technology Commission of Shanghai Municipality(No.19DZ2271100)。
文摘In this work,a flake-structured Co2B2O5 material was obtained by a simple sol-gel method and researched for use in sodium ion batteries firstly.When serving as anode material for sodium ion batteries,it exhibits the high initial reversible capacity of 466 mAh·g-1 at a current density of 100 mA·g-1.Through the recombination of carbon nanotubes(CNTs),the composite Co2B2O5/CNTs delivers the initial reversible capacity of 464 mAh·g-1,and324 mAh·g-1 is obtained after 60 cycles under the current density of 100 mA·g-1.When under the current density of 1000 mA·g-1,a capacity of 236 mAh·g-1 is obtained for Co2B2O5/CNTs while 160 mAh·g-1 for Co2B2O5.Moreover,the sodium storage behavior of Co2B2O5 is identified by kinetic analysis.The higher Na+capacitive contribution of Co2B2O5/CNTs could account for the enhanced rate performance.The results indicate that Co2B2O5 is a promising anode material for sodium ion batteries.
基金supported by the National Natural Science Foundation of China(Nos.51402103 and 51302079)
文摘Nb_2O_5/C nanosheets are successfully prepared through a mixing process and followed by heating treatment.Such Nb_2O_5/C based electrode exhibits high rate performance and remarkable cycling ability,showing a high and stable specific capacity of ~380mAhg^（-1） at the current density of 50 mAg^（-1）（much higher than the theoretical capacity of Nb_2O_5）.Further more,at a current density of 500mAg^（-1）,the nanocomposites electrode still exhibits a specific capacity of above 150 mAh g^（-1） after 100 cycles.These results suggest the Nb_2O_5/C nanocomposite is a high performance anode material for lithium-ion batteries.
