Phase modulation of noble metal alloys(NMAs)is critically important in nanoscience since the distinct atomic arrangements can largely determine their physicochemical properties.However,the precise modulation of NMAs i...Phase modulation of noble metal alloys(NMAs)is critically important in nanoscience since the distinct atomic arrangements can largely determine their physicochemical properties.However,the precise modulation of NMAs is formidably challenging,because thermodynamically stable phases are generally preferential compared to those metastable ones.Herein,we proposed a potential energy trapping strategy for phase modulation of Pd–Te alloys with solvents.Thereinto,ethylene glycol can increase the energy barrier for both Pd leaching and Te introduction,forming metastable Pd20Te7 phase.Inversely,N,N-dimethylformamide is unable to trap metastable phase,inducing the phase evolution to thermodynamically stable PdTe phase,and the precise phase modulation was realized including Pd20Te7,PdTe and PdTe2 phases.The Pd–Te alloys displayed phase-dependent formic acid oxidation catalytic performance with PdTe phase showing the best.This work proposes a strategy for creating metastable phase with potential energy trap,which may deepen the understanding of phase engineering for noble metal-based nanocrystals.展开更多
基金supports by the National Key R&D Program of China(2020YFB1505802)the Ministry of Science and Technology(2017YFA0208200)+2 种基金the National Natural Science Foundation of China(22025108,U21A20327,22121001)Guangdong Provincial Natural Science Fund for Distinguished Young Scholars(2021B1515020081)start-up support from Xiamen University and the Guangzhou Key Laboratory of Low Dimensional Materials and Energy Storage Devices(20195010002).
文摘Phase modulation of noble metal alloys(NMAs)is critically important in nanoscience since the distinct atomic arrangements can largely determine their physicochemical properties.However,the precise modulation of NMAs is formidably challenging,because thermodynamically stable phases are generally preferential compared to those metastable ones.Herein,we proposed a potential energy trapping strategy for phase modulation of Pd–Te alloys with solvents.Thereinto,ethylene glycol can increase the energy barrier for both Pd leaching and Te introduction,forming metastable Pd20Te7 phase.Inversely,N,N-dimethylformamide is unable to trap metastable phase,inducing the phase evolution to thermodynamically stable PdTe phase,and the precise phase modulation was realized including Pd20Te7,PdTe and PdTe2 phases.The Pd–Te alloys displayed phase-dependent formic acid oxidation catalytic performance with PdTe phase showing the best.This work proposes a strategy for creating metastable phase with potential energy trap,which may deepen the understanding of phase engineering for noble metal-based nanocrystals.
