b The discharge performance of Mg-Al-Pb-La anode was investigated by electrochemical techniques and compared withthat of Mg-Al-Pb alloy. The results indicate that the Mg-Al-Pb-La anode provides enhanced corrosion resi...b The discharge performance of Mg-Al-Pb-La anode was investigated by electrochemical techniques and compared withthat of Mg-Al-Pb alloy. The results indicate that the Mg-Al-Pb-La anode provides enhanced corrosion resistance at open circlepotential, and exhibits better discharge activity than the Mg-Al-Pb alloy. The utilization efficiency of Mg-Al-Pb-La anode ishigher than that of commercial Mg-Al-Zn （AZ） and Mg-Al-Mn （AM） alloys. A single Mg-air battery with Mg-Al-Pb-La alloy asthe anode and air as the cathode has an average discharge potential of 1.295 V and a discharge capacity of 1370 mA·h/g duringdischarge at 10 mA/cm2, which is higher than that of batteries using Mg-Li anodes. The enhancement in discharge performance ofthe Mg-Al-Pb-La anode is caused by its modified microstructure, which reduces the self-corrosion and accelerates the spalling ofoxidation products during battery discharge. Furthermore, the dissolution mechanism of Mg-Al-Pb-La anode during the dischargeprocess was analyzed.展开更多
To obtain a new kind of Mg?Al?Pb alloy anode material with low content of Pb, the corrosion and discharge behavior of Mg?9%Al?2.5%Pb (hereafter in mass fraction) alloy were investigated by immersion tests and electroc...To obtain a new kind of Mg?Al?Pb alloy anode material with low content of Pb, the corrosion and discharge behavior of Mg?9%Al?2.5%Pb (hereafter in mass fraction) alloy were investigated by immersion tests and electrochemical techniques, and compared with those of Mg?6%Al?5%Pb alloy. The results indicate that Mg?9%Al?2.5%Pb alloy exhibits a lower self-corrosion rate and higher utilization efficiency in contrast with Mg?6%Al?5%Pb alloy because of the higher content of Al. As the result of the decrease of Pb content, the discharge activity of Mg?9%Al?2.5%Pb alloy is relatively weaker but still meets the requirement of anode. These results reveal that Mg?9%Al?2.5%Pb alloy with a low content of Pb can serve as a good candidate for the anode material used in seawater activated battery.展开更多
Solar thermochemical CO_(2)-splitting(STCS)is a promising solution for solar energy harvesting and storage.However,practical solar fuel production by utilizing earth-abundant iron/iron oxides remains a great challenge...Solar thermochemical CO_(2)-splitting(STCS)is a promising solution for solar energy harvesting and storage.However,practical solar fuel production by utilizing earth-abundant iron/iron oxides remains a great challenge because of the formation of passivation layers,resulting in slow reaction kinetics and limited CO_(2)conversion.Here,we report a novel material consisting of an iron-nickel alloy embedded in a perovskite substrate for intensified CO production via a two-step STCS process.The novel material achieved an unprecedented CO production rate of 381 mL g^(-1)min^(-1)with 99%CO_(2)conversion at 850℃,outperforming state-of-the-art materials.In situ structural analyses and density functional theory calculations show that the alloy/substrate interface is the main active site for CO_(2)splitting.Preferential oxidation of the FeNi alloy at the interface(as opposed to forming an FeO_(x)passivation shell encapsulating bare metallic iron)and rapid stabilization of the iron oxide species by the robust perovskite matrix significantly promoted the conversion of CO_(2)to CO.Facile regeneration of the alloy/perovskite interfaces was realized by isothermal methane reduction with simultaneous production of syngas(H_(2)/CO=2,syngas yield>96%).Overall,the novel perovskite-mediated dealloying-exsolution redox system facilitates highly efficient solar fuel production,with a theoretical solar-to-fuel efficiency of up to 58%,in the absence of any heat integration.展开更多
基金Project(2015JC3004)supported by the Science and Technology Plan of Hunan Province,ChinaProject(2016JJ2147)supported by the Natural Science Foundation of Hunan Province,ChinaProject(51401243)supported by the National Natural Science Foundation of China
文摘b The discharge performance of Mg-Al-Pb-La anode was investigated by electrochemical techniques and compared withthat of Mg-Al-Pb alloy. The results indicate that the Mg-Al-Pb-La anode provides enhanced corrosion resistance at open circlepotential, and exhibits better discharge activity than the Mg-Al-Pb alloy. The utilization efficiency of Mg-Al-Pb-La anode ishigher than that of commercial Mg-Al-Zn （AZ） and Mg-Al-Mn （AM） alloys. A single Mg-air battery with Mg-Al-Pb-La alloy asthe anode and air as the cathode has an average discharge potential of 1.295 V and a discharge capacity of 1370 mA·h/g duringdischarge at 10 mA/cm2, which is higher than that of batteries using Mg-Li anodes. The enhancement in discharge performance ofthe Mg-Al-Pb-La anode is caused by its modified microstructure, which reduces the self-corrosion and accelerates the spalling ofoxidation products during battery discharge. Furthermore, the dissolution mechanism of Mg-Al-Pb-La anode during the dischargeprocess was analyzed.
基金Projects(5140124351101171)supported by the National Natural Science Foundation of China+1 种基金Projects(2015T808832014M552151)supported by China Postdoctoral Science Foundation
文摘To obtain a new kind of Mg?Al?Pb alloy anode material with low content of Pb, the corrosion and discharge behavior of Mg?9%Al?2.5%Pb (hereafter in mass fraction) alloy were investigated by immersion tests and electrochemical techniques, and compared with those of Mg?6%Al?5%Pb alloy. The results indicate that Mg?9%Al?2.5%Pb alloy exhibits a lower self-corrosion rate and higher utilization efficiency in contrast with Mg?6%Al?5%Pb alloy because of the higher content of Al. As the result of the decrease of Pb content, the discharge activity of Mg?9%Al?2.5%Pb alloy is relatively weaker but still meets the requirement of anode. These results reveal that Mg?9%Al?2.5%Pb alloy with a low content of Pb can serve as a good candidate for the anode material used in seawater activated battery.
文摘Solar thermochemical CO_(2)-splitting(STCS)is a promising solution for solar energy harvesting and storage.However,practical solar fuel production by utilizing earth-abundant iron/iron oxides remains a great challenge because of the formation of passivation layers,resulting in slow reaction kinetics and limited CO_(2)conversion.Here,we report a novel material consisting of an iron-nickel alloy embedded in a perovskite substrate for intensified CO production via a two-step STCS process.The novel material achieved an unprecedented CO production rate of 381 mL g^(-1)min^(-1)with 99%CO_(2)conversion at 850℃,outperforming state-of-the-art materials.In situ structural analyses and density functional theory calculations show that the alloy/substrate interface is the main active site for CO_(2)splitting.Preferential oxidation of the FeNi alloy at the interface(as opposed to forming an FeO_(x)passivation shell encapsulating bare metallic iron)and rapid stabilization of the iron oxide species by the robust perovskite matrix significantly promoted the conversion of CO_(2)to CO.Facile regeneration of the alloy/perovskite interfaces was realized by isothermal methane reduction with simultaneous production of syngas(H_(2)/CO=2,syngas yield>96%).Overall,the novel perovskite-mediated dealloying-exsolution redox system facilitates highly efficient solar fuel production,with a theoretical solar-to-fuel efficiency of up to 58%,in the absence of any heat integration.
