Biaxial strained dual-phase palladium-copper bimetal boosts formic acid electrooxidation  

作　　者：Jiarun Geng Zhuo Zhu Youxuan Ni Haixia Li Fangyi Cheng Fujun Li Jun Chen 

机构地区：[1]Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Renewable Energy Conversion and Storage Center(RECAST),College of Chemistry,Nankai University,Tianjin 300071,China

出　　处：《Nano Research》2022年第1期280-284,共5页纳米研究（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2016YFB0101201);the National Natural Science Foundation of China(Nos.21822506 and 51761165025);the 111 project of B12015.

摘　　要：Surface strain engineering is considered as an effective strategy to promote the electrocatalytic properties of noble metal nanocrystals.Herein,we construct a dual-phase palladium-copper(DP-PdCu)bimetallic electrocatalyst with remarkable biaxial strain via a one-pot wet-chemical approach for formic acid oxidation.The biaxial strain originates from the lattice mismatch between the disordered face-centered cubic(FCC)phase and ordered body-centered cubic(BCC)phase in each of DP-PdCu:nanoparticles.The proportion of FCC and BCC phases and size of PdCu nanoparticles are dependent on the addition amount of:capping agent,cetyltrimethylammonium bromide(CTAB).Density functional theory calculations reveal the downshift of d-band:center of Pd atoms due to the interfacial strain,which weakens the adsorption strength of undesired intermediates.These merit the,DP-PdCu catalyst with superior mass activity of 0.55 A·mg_(pd)^(-1) and specific activity of 1.91 mA·cm_(pd)^(-2) toward formic acid oxidation,outperforming the single FCC/EICC PdCu and commercial Pd/C catalysts.This will provide new insights into the structure design of high-performance electrocatalysts via strain engineering.

关 键 词：palladium-copper dual phase biaxial strain formic acid oxidation SIZE-DEPENDENCE 

分 类 号：O64[理学—物理化学]