摘要：Bioceramics have attracted extensive attention for bone defect repair due to their excellent bioactivity and ***,challenges remain in matching the rate between bioceramic degradation and new bone formation,necessitating a deeper understanding of their degradation *** this study,density functional theory(DFT)calculations was employed to explore the structural and electronic characteristics of silicate *** findings reveal a linear correlation between the maximum isosurface value of the valence band maximum(VBM_(Fmax))and the degradability of silicate *** correlation was subsequently validated through degradation ***,the investigation on phosphate bioceramics demonstrates the potential of this descriptor in predicting the degradability of a broader range of *** discovery offers valuable insights into the degradation mechanism of bioceramics and holds promise for accelerating the design and development of bioceramics with controllable degradation.

摘要：Platinum(Pt)is an efficient catalyst for hydrogen evolution reaction(HER)and oxygen reduction reaction(ORR),but the debate of the relevance between the Pt particle size and its electrocatalytic activity still *** strong metal–support interaction(SMSI)between the metal and carrier causes the charge transfer and mass transport from the support to the ***,Pt species(0.5 wt.%)with various particle sizes supported on carbon nanotubes(CNTs)have been synthesized by a photo-reduction ***^1.5 nm-sized Pt catalyst shows much higher HER performance than the counterparts in all pH solutions,and the mass activity of it is even 23–36 times that of Pt/*** for ORR,the^3 nm-sized Pt catalyst exhibits the optimal performance,and the mass activity is 3 times and even 16 times that of Pt/C in acidic and alkaline media,*** high HER and ORR performances of the^1.5 nm-and^3 nm-sized Pt catalysts benefit from the SMSI between Pt and the CNTs matrix and the higher ratio of face sites to edge sites,which is meaningful for the design of efficient electrocatalysts for renewable energy application.