The conductivity of MnCo2O4 spinel,the best route to form the MnCo2O4 protective coating applied by the sol-gel process,and its effect on the intermediate temperature oxidation behavior of SUS 430 alloy,a typical mate...The conductivity of MnCo2O4 spinel,the best route to form the MnCo2O4 protective coating applied by the sol-gel process,and its effect on the intermediate temperature oxidation behavior of SUS 430 alloy,a typical material for the interconnect of solid oxide fuel cell(SOFC),was investigated.The phase structure and surface morphology of the coating and surface oxides were characterized by XRD,SEM and EDS;the "4-probe" method was employed to determine the conductivity of MnCo2O4 spinel and the area specific resistance(ASR)of the surface oxides.The conductivity of MnCo2O4 spinel is excellent,which is 2 orders of magnitude better than that of MnCr2O4 spinel.Long-term thermally cyclic oxidation at 750°C in SOFC cathode atmosphere and ASR measurement have shown that calcined in reducing atmosphere followed by pre-oxidation in the air is the best technique for forming the MnCo2O4 protective coating,which enhances the oxidation resistance,and improves the electrical conductivity and adherence of coated SUS 430 alloy significantly.As a result,the MnCo2O4 spinel is the most potential candidate for SOFC metallic interconnect protective coating application.展开更多
To satisfy the upsurging demand for energy storage in modern society,anode materials which can deliver high capacity have been intensively researched for the next generation lithium ion batteries.Typically,the binary ...To satisfy the upsurging demand for energy storage in modern society,anode materials which can deliver high capacity have been intensively researched for the next generation lithium ion batteries.Typically,the binary MnCo_2O_4 with a characteristic coupled metal cations showed promising potential due to its high theoretical capacity and low cost.Here,by means of a well-designed synthesis control,we demonstrated a scalable process to achieve a hierarchical structure of MnCo_2O_4,which existed as uniform microspheres with embedded mesopores,showing favorable structural characters for high performance during a fast charge/discharge process.Our synthesis highlighted the importance of sodium salicylate as an essential additive to control the precipitation of the two involved metal cations.It was proved that a dual role was played sodium salicylate which cannot only facilitate the formation of microspheric shape,but also act as an effective precursor for the creation of inner mesopores.We confirmed that the hierarchically-structured MnCo_2O_4 showed outstanding performance when it was tested as an anode material in lithium ion batteries as revealed by its extraordinary cycling stability and high rate capability.展开更多
基金supported by National High Technology Research and Development Program of China(2006AA03Z227)National Natural Science Foundation of China(50771048)the Analytical and Testing Center of Huazhong University of Science and Technology for SEM and XRD assistance
文摘The conductivity of MnCo2O4 spinel,the best route to form the MnCo2O4 protective coating applied by the sol-gel process,and its effect on the intermediate temperature oxidation behavior of SUS 430 alloy,a typical material for the interconnect of solid oxide fuel cell(SOFC),was investigated.The phase structure and surface morphology of the coating and surface oxides were characterized by XRD,SEM and EDS;the "4-probe" method was employed to determine the conductivity of MnCo2O4 spinel and the area specific resistance(ASR)of the surface oxides.The conductivity of MnCo2O4 spinel is excellent,which is 2 orders of magnitude better than that of MnCr2O4 spinel.Long-term thermally cyclic oxidation at 750°C in SOFC cathode atmosphere and ASR measurement have shown that calcined in reducing atmosphere followed by pre-oxidation in the air is the best technique for forming the MnCo2O4 protective coating,which enhances the oxidation resistance,and improves the electrical conductivity and adherence of coated SUS 430 alloy significantly.As a result,the MnCo2O4 spinel is the most potential candidate for SOFC metallic interconnect protective coating application.
基金supported by the National Natural Science Foundation of China(51672282,21373238)the National Basic Research Program of China(2013CB934000)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA09010101)
文摘To satisfy the upsurging demand for energy storage in modern society,anode materials which can deliver high capacity have been intensively researched for the next generation lithium ion batteries.Typically,the binary MnCo_2O_4 with a characteristic coupled metal cations showed promising potential due to its high theoretical capacity and low cost.Here,by means of a well-designed synthesis control,we demonstrated a scalable process to achieve a hierarchical structure of MnCo_2O_4,which existed as uniform microspheres with embedded mesopores,showing favorable structural characters for high performance during a fast charge/discharge process.Our synthesis highlighted the importance of sodium salicylate as an essential additive to control the precipitation of the two involved metal cations.It was proved that a dual role was played sodium salicylate which cannot only facilitate the formation of microspheric shape,but also act as an effective precursor for the creation of inner mesopores.We confirmed that the hierarchically-structured MnCo_2O_4 showed outstanding performance when it was tested as an anode material in lithium ion batteries as revealed by its extraordinary cycling stability and high rate capability.
