A skutterudite-related antimonide, CoFe3Sb12,was prepared with vacuum melting.XRD analysis showed the material contained Sb, FeSb2, CoSb2 and CoSb3 phases.The electrochemical properties of the ball-milled CoFe3Sb12-10...A skutterudite-related antimonide, CoFe3Sb12,was prepared with vacuum melting.XRD analysis showed the material contained Sb, FeSb2, CoSb2 and CoSb3 phases.The electrochemical properties of the ball-milled CoFe3Sb12-10wt% graphite composite were studied using pure lithium as the reference electrode. A maximal lithium inserting capacity of about 860 mAh/g was obtained in the first cycle.The reversible capacity of the material was about 560mAh/g in the first cycle and decreased to ca.320 mAh/g and 250 mAh/g after 10 and 20 cycles respectively.Ex-situ XRD analyses showed that the antimonides in the pristine material were decomposed after the first discharge and that antimony was the active element for lithium to insert into the host material.展开更多
Instead of the energy-intensive Haber-Bosch process, electrochemical nitrogen reduction reaction(NRR) is an exciting new carbon neutral technique for ammonia synthesis under ambient conditions. In this work, we invest...Instead of the energy-intensive Haber-Bosch process, electrochemical nitrogen reduction reaction(NRR) is an exciting new carbon neutral technique for ammonia synthesis under ambient conditions. In this work, we investigated K-based electrocatalysts theoretically and demonstrated thatK_(3)Sb/graphene performs excellent activity and inhibits hydrogen evolution on alternating reactionpathway. The first hydrogenation step from N_(2)^(*) to NNH^(*) was found to be the most energetic andlimiting step (0.61 eV). Graphene substrate plays the critical role to promote electronic conductivitybetween K_(3)Sb and dinitrogen.展开更多
文摘A skutterudite-related antimonide, CoFe3Sb12,was prepared with vacuum melting.XRD analysis showed the material contained Sb, FeSb2, CoSb2 and CoSb3 phases.The electrochemical properties of the ball-milled CoFe3Sb12-10wt% graphite composite were studied using pure lithium as the reference electrode. A maximal lithium inserting capacity of about 860 mAh/g was obtained in the first cycle.The reversible capacity of the material was about 560mAh/g in the first cycle and decreased to ca.320 mAh/g and 250 mAh/g after 10 and 20 cycles respectively.Ex-situ XRD analyses showed that the antimonides in the pristine material were decomposed after the first discharge and that antimony was the active element for lithium to insert into the host material.
基金support by Guangdong Innovation Research Team for Higher Education(No.2017KCXTD030)High-level Talents Project of Dongguan University of Technology(No.KCYKYQD2017017)+1 种基金Research Center of New Energy Materials(No.KCYCXPT2017005)Engineering Research Centre of None-food Biomass Efficient Pyrolysis and Utilization Technology of Guangdong Higher Education Institutes(No.2016GCZX009).
文摘Instead of the energy-intensive Haber-Bosch process, electrochemical nitrogen reduction reaction(NRR) is an exciting new carbon neutral technique for ammonia synthesis under ambient conditions. In this work, we investigated K-based electrocatalysts theoretically and demonstrated thatK_(3)Sb/graphene performs excellent activity and inhibits hydrogen evolution on alternating reactionpathway. The first hydrogenation step from N_(2)^(*) to NNH^(*) was found to be the most energetic andlimiting step (0.61 eV). Graphene substrate plays the critical role to promote electronic conductivitybetween K_(3)Sb and dinitrogen.
