摘要
Magnesium hydride(MgH_(2)) is recognized as a promising candidate for solid-state hydrogen storage due to its high hydrogen capacity and safety.However,its highly stable thermodynamics and slow kinetics pose challenges to its commercial application.To effectively solve these problems,Ni-Ti based MOFs(NT-MOF and NT-MOFx(x=Ar,O_(2),and H_(2))) are prepared as effective catalysts for MgH_(2),with NT-MOF-Ar/MgH_(2) showing the best performance.The onset dehydrogenation temperature of NTMOF-Ar/MgH_(2) is reduced to 197 ℃ and remains 97% H_(2) capacity after 20 cycles.An interface reconstruction which enables its superior catalytic performance is evidenced.By in situ forming a multiphase-multi valence Mg-Ni-Ti-C catalytic interface:Mg2Ni/Mg2NiH4 act as a hydrogen pump,multi valence Ti facilitates charge transfer,while amorphous carbon mitigates agglomeration,enhancing long-term performance.Our work verifies the interface reconstruction in a MgH_(2) hydrogen storage system,thus paving ways for developing new catalytic mechanisms and efficient catalysts for hydrogen storage and other energy related fields.
基金
financially supported by the Ministry of Human Resources and Social Security of China(No.H20240121)
