The use of industrial-grade FeV80 master alloy in the synthesis of solid hydrogen storage alloys,rather than pure V,offers substantial economic advantages.However,FeV80 master alloy contains about 5 wt%of Al,Si,O and ...The use of industrial-grade FeV80 master alloy in the synthesis of solid hydrogen storage alloys,rather than pure V,offers substantial economic advantages.However,FeV80 master alloy contains about 5 wt%of Al,Si,O and other impurities,which adversely affect the hydrogen storage performance.In this work,the effective dehydrogenation capacity of Ti31Cr35(FeV80-Ce)34 alloy prepared by Ce pre-refining FeV80master alloy process reaches 2.42 wt%.By comparing the phase distribution and composition before and after pre-refining,Ce pre-refining significantly reduces the presence of Al and O,inhibits the formation of Ti-rich phase and the generation of SiO2 in Ti31Cr35(FeV80-Ce)34 alloys.By X-ray photoelectron spectroscopy(XPS)analysis,the metal content of the matrix element increases and the binding energy decreases after Ce pre-refining.The slope factor of pressure-composition-temperature(PCT)curve decreases from 0.60 to 0.48 after Ce pre-refining,which improves the dehydrogenation perfo rmance.The dehydrogenation activation energy and enthalpy change of the Ti31Cr35(FeV80-Ce)34 alloy before and after pre-refining are also calculated using kinetics and PCT curves.Furthermore,the Ti31Cr35(FeV80-Ce)34 alloy exhibits a capacity retention of 81%after 200 cycles,surpassing reported values for FeV80-based hydrogen storage alloys.It provides a new idea for developing low-cost and high-capacity FeV80-base hydrogen storage alloys.展开更多
基金Project supported by the National Key R&D Program of China(2022YFB3504700)Strategic Priority Research Program of the Chinese Academy of Sciences(XDA0400304)。
摘要The use of industrial-grade FeV80 master alloy in the synthesis of solid hydrogen storage alloys,rather than pure V,offers substantial economic advantages.However,FeV80 master alloy contains about 5 wt%of Al,Si,O and other impurities,which adversely affect the hydrogen storage performance.In this work,the effective dehydrogenation capacity of Ti31Cr35(FeV80-Ce)34 alloy prepared by Ce pre-refining FeV80master alloy process reaches 2.42 wt%.By comparing the phase distribution and composition before and after pre-refining,Ce pre-refining significantly reduces the presence of Al and O,inhibits the formation of Ti-rich phase and the generation of SiO2 in Ti31Cr35(FeV80-Ce)34 alloys.By X-ray photoelectron spectroscopy(XPS)analysis,the metal content of the matrix element increases and the binding energy decreases after Ce pre-refining.The slope factor of pressure-composition-temperature(PCT)curve decreases from 0.60 to 0.48 after Ce pre-refining,which improves the dehydrogenation perfo rmance.The dehydrogenation activation energy and enthalpy change of the Ti31Cr35(FeV80-Ce)34 alloy before and after pre-refining are also calculated using kinetics and PCT curves.Furthermore,the Ti31Cr35(FeV80-Ce)34 alloy exhibits a capacity retention of 81%after 200 cycles,surpassing reported values for FeV80-based hydrogen storage alloys.It provides a new idea for developing low-cost and high-capacity FeV80-base hydrogen storage alloys.