In recent years,ionic modulation,particularly hydrogen intercalation,has gained attention as a powerful method for tuning the properties of materials.Although the SrFeO_(x)system is similar to SrCoO_(x),which can be p...In recent years,ionic modulation,particularly hydrogen intercalation,has gained attention as a powerful method for tuning the properties of materials.Although the SrFeO_(x)system is similar to SrCoO_(x),which can be protonated to the HSrCoO_(2.5)phase,it remains a challenge for the hydrogenation of SrFeO_(2.5).In this study,starting from the perovskite SrFeO_(3−δ),we achieved hydrogen intercalation and obtained stable hydrogenated brownmillerite-phase HSrFeO_(2.5)via Pt-catalyzed H-spillover at room temperature.The results indicate that the hydrogenation process is accompanied by the simultaneous oxygen ionic release,that is,perovskite SrFeO_(3−δ)is the prerequisite for the hydrogen-induced phase transition.Subsequently,upon hydrogenation,the entire phase transition cycle among the perovskite SrFeO_(3−δ),brownmillerite SrFeO_(2.5),and the hydrogenated HSrFeO_(2.5)phase,is completed.Furthermore,SrFeO_(3−δ)exhibits a remarkable 9.4%lattice expansion,and its electronic state undergoes a multi-step evolution,transforming from a pristine helical antiferromagnetic insulator to a bad metal,eventually returning to an antiferromagnetic insulator.Based on the obtained results,we fabricated microscale patterns with varied surface morphologies and electrical conductivities that can be used in fabricating electronic devices.This study presents a novel approach for modulating the properties of correlated and functional materials.展开更多
基金supported by the National Key R&D Program of China(Grant Nos.2022YFA1403000 and 2024YFA1408302)the CAS Project for Young Scientists in Basic Research(Grant No.YSBR-047)the Strategic Priority Research Program of the Chinese Academy of Sciences of China(Grant No.XDB33000000)。
文摘In recent years,ionic modulation,particularly hydrogen intercalation,has gained attention as a powerful method for tuning the properties of materials.Although the SrFeO_(x)system is similar to SrCoO_(x),which can be protonated to the HSrCoO_(2.5)phase,it remains a challenge for the hydrogenation of SrFeO_(2.5).In this study,starting from the perovskite SrFeO_(3−δ),we achieved hydrogen intercalation and obtained stable hydrogenated brownmillerite-phase HSrFeO_(2.5)via Pt-catalyzed H-spillover at room temperature.The results indicate that the hydrogenation process is accompanied by the simultaneous oxygen ionic release,that is,perovskite SrFeO_(3−δ)is the prerequisite for the hydrogen-induced phase transition.Subsequently,upon hydrogenation,the entire phase transition cycle among the perovskite SrFeO_(3−δ),brownmillerite SrFeO_(2.5),and the hydrogenated HSrFeO_(2.5)phase,is completed.Furthermore,SrFeO_(3−δ)exhibits a remarkable 9.4%lattice expansion,and its electronic state undergoes a multi-step evolution,transforming from a pristine helical antiferromagnetic insulator to a bad metal,eventually returning to an antiferromagnetic insulator.Based on the obtained results,we fabricated microscale patterns with varied surface morphologies and electrical conductivities that can be used in fabricating electronic devices.This study presents a novel approach for modulating the properties of correlated and functional materials.
