【摘 要】
：
The multi-metallene with an ultrahigh surface area has great potential in precise tuning of surface heterogeneous d-electronic correlation by surface strain effect for the distinctive surface electronic structure,which is a brand new class of promising 2D
【机 构】
：
School of Materials Science and Engineering,Peking University,Beijing 100871,China;Department of App
论文部分内容阅读
The multi-metallene with an ultrahigh surface area has great potential in precise tuning of surface heterogeneous d-electronic correlation by surface strain effect for the distinctive surface electronic structure,which is a brand new class of promising 2D electrocatalyst for sustainable energy device application.However,achieving such an atomically thin multi-metallene still presents a great challenge.Herein,we present a new synthetic method for an atomic-level palladium-iridium (PdIr) bimetallene with an average thickness of only ～ 1.0 nm for achieving superior catalysis in the hydrogen evolution reaction(HER) and the formic acid oxidation reaction (FAOR).The curved PdIr bimetallene presents a top-ranked high electrochemical active area of 127.5 ± 10.8 m2 gPd+ir-1 in the reported noble alloy materials,and exhibits a very low overpotential,ultrahigh activity and improved stability for HER and FAOR.DFT calculation reveals that the PdIr bimetallene herein has a unique lattice tangential strain,which can induce surface distortion while concurrently creating a variety of concave-convex featured micro-active regions formed by variously coordinated Pd sites agglomeration.Such a strong strain effect correlates the abnormal on-site active 4d10-t2g-orbital Coulomb correlation potential and directly elevates orbital-electronegativity exposure within these active regions,resulting in a preeminent barrier-free energetic path for significant enhancement of FAOR and HER catalytic performance.
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