Recently, more and more attention is paid on applications of molten chlorides in concentrated solar power （CSP） plants as high-temperature thermal energy storage （TES） and heat transfer fluid （HTF） materials due...Recently, more and more attention is paid on applications of molten chlorides in concentrated solar power （CSP） plants as high-temperature thermal energy storage （TES） and heat transfer fluid （HTF） materials due to their high thermal stability limits and low prices, compared to the commercial TES/HTF materials in CSP- nitrate salt mixtures. A higher TES/HTF operating temperature leads to higher efficiency of thermal to electrical energy conversion of the power block in CSP, however causes additional challenges, particularly increased corrosiveness of metallic alloys used as contain- ers and structural materials. Thus, it is essential to study corrosion behaviors and mechanisms of metallic alloys in molten chlorides at operating temperatures （500-800℃） for realizing the commercial application of molten chlorides in CSE The results of studies on hot corrosion of metallic alloys in molten chlorides are reviewed to understand their corrosion behaviors and mechanisms under various conditions （e.g., temperature, atmosphere）. Emphasis has also been given on salt purification to reduce corrosive impurities in molten chlorides and development of electrochemical techniques to in-situ monitor corrosive impurities in molten chlorides, in order to efficiently control corrosion rates of metallic alloys in molten chlorides to meet the requirements of industrial applications.展开更多
AB5 （MlNi4.0Al0.3Cu0.5Zn0.2） alloy and CoB alloy were prepared by arc melting. AB5-CoB composites were synthesized by simple mixing of AB5 alloy powders and CoB alloy powders, and their electrochemical hydrogen stor...AB5 （MlNi4.0Al0.3Cu0.5Zn0.2） alloy and CoB alloy were prepared by arc melting. AB5-CoB composites were synthesized by simple mixing of AB5 alloy powders and CoB alloy powders, and their electrochemical hydrogen storage properties were studied as negative electrodes in KOH aqueous solution. The maximum discharge capacity of the AB5-CoB（50%） composite （the content of CoB in the composite is 50 wt.%） reached 365.3 mAh.g^-1. After 100 charge-discharge cycles, the discharge capacity of the AB5-CoB（50%） composite was still much higher than that of the AB5 alloy. The high rate discharge capability （HRD） and potentiodynamic polarization were also tested.展开更多
文摘Recently, more and more attention is paid on applications of molten chlorides in concentrated solar power （CSP） plants as high-temperature thermal energy storage （TES） and heat transfer fluid （HTF） materials due to their high thermal stability limits and low prices, compared to the commercial TES/HTF materials in CSP- nitrate salt mixtures. A higher TES/HTF operating temperature leads to higher efficiency of thermal to electrical energy conversion of the power block in CSP, however causes additional challenges, particularly increased corrosiveness of metallic alloys used as contain- ers and structural materials. Thus, it is essential to study corrosion behaviors and mechanisms of metallic alloys in molten chlorides at operating temperatures （500-800℃） for realizing the commercial application of molten chlorides in CSE The results of studies on hot corrosion of metallic alloys in molten chlorides are reviewed to understand their corrosion behaviors and mechanisms under various conditions （e.g., temperature, atmosphere）. Emphasis has also been given on salt purification to reduce corrosive impurities in molten chlorides and development of electrochemical techniques to in-situ monitor corrosive impurities in molten chlorides, in order to efficiently control corrosion rates of metallic alloys in molten chlorides to meet the requirements of industrial applications.
基金supported by the National High-Tech Research and Development Program of China (Nos.2007AA05Z149 and 2007AA05Z108)the Major State Basic Research Development Program of China (No.2010CB631303)+2 种基金the National Natural Science Foundation of China (Nos.50631020,50701025,and 50971071)the Doctoral Foundation of the Ministry of Education of China (No.20070055064)the Natural Science Foundation of Tianjin,China (No.07JCYBJC03500)
文摘AB5 （MlNi4.0Al0.3Cu0.5Zn0.2） alloy and CoB alloy were prepared by arc melting. AB5-CoB composites were synthesized by simple mixing of AB5 alloy powders and CoB alloy powders, and their electrochemical hydrogen storage properties were studied as negative electrodes in KOH aqueous solution. The maximum discharge capacity of the AB5-CoB（50%） composite （the content of CoB in the composite is 50 wt.%） reached 365.3 mAh.g^-1. After 100 charge-discharge cycles, the discharge capacity of the AB5-CoB（50%） composite was still much higher than that of the AB5 alloy. The high rate discharge capability （HRD） and potentiodynamic polarization were also tested.
