摘要
Ordered mesoporous noble metals(NMs)have displayed unique catalytic and electrocatalytic performance distinctive from traditional nanoparticles.Despite great efforts,the range of mesoporous NMs is mainly limited to single metals and their metal alloys with random atomic arrangements.Herein,we report a simple solid-phase synthesis of novel mesoporous intermetallic noble metal-nonmetal(MI-PtX_(2))nanoparticles with hierarchical orderliness as highly efficient electrocatalysts for hydrogen evolution reaction(HER).The synthesis relies on a Pt-to-PtX_(2) evolution with mesoporous Pt confined in thermally stable KIT-6(Korea Advanced Institute of Science and Technology-6)as the concurrent template.Meanwhile,the method could be extended readily to control structures and compositions of mesoporous intermetallic nanoparticles such as hollow structures and ternary MI-PtMP_(2).Samples featured rhombic dodecahedral morphology,ordered gyroid mesostructure,and cubic/hexagonal intermetallic phase,producing abundant undercoordinated sites and optimized surface electronic structures.These features kinetically accelerate H_(2)O dissociation to remarkably enhance electrocatalytic HER performance.The optimum MI-PtP_(2) disclosed ultrahigh mass/specific activity(3.31 A mg_(pt)^(−1)/7.75 mA cm_(pt)^(−2))and superior stability(only 15.2%of mass activity loss after an accelerated durability test for 30,000 cycles),suppressing the reported electrocatalysts.Our work opens up new opportunities for designing and synthesizing novel hierarchically ordered mesoporous electrocatalysts with targeted functions for a variety of applications.
