A low-melting-point metal doping strategy for the synthesis of small-sized intermetallic Pt_(5)Ce fuel cell catalysts  

作　　者：Zi-Jun Zou Shi-Yi Yin Yao Tang Sheng-Liang Zhong Lei Wang Shi-Long Xu Hai-Wei Liang 

机构地区：[1]College of Chemistry and Chemical Engineering,Jiangxi Normal University,Nanchang 330022,China [2]Department of Chemistry,University of Science and Technology of China,Hefei 230026,China [3]School of Materials and Chemical Engineering,Anhui Jianzhu University,Hefei 230601,China

出　　处：《Nano Research》2024年第9期8112-8118,共7页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22065016 and 22071225);the Plan for Anhui Major Provincial Science&Technology Project(Nos.202203a0520013 and 2021d05050006);the fellowship of China Postdoctoral Science Foundation(No.2022M712179).

摘　　要：Carbon-supported platinum-lanthanum(Pt-Ln)intermetallic compound(IMC)nanoparticles with high activity and robust stability have been demonstrated as promising cathode catalysts for proton-exchange membrane fuel cells.However,the preparation of Pt-Ln IMC catalysts needs high-temperature annealing treatment that inevitably causes nanoparticle sintering,resulting in significant reduction of the electrochemical surface area and mass-based activity.Here,we prepare small-sized M-doped Pt_(5)Ce(M=Ga,Cd,and Sb)IMCs catalysts via a low-melting-point metal doping strategy.We speculate that the doping of low-melting-point metals can facilitate the generation of vacancies in the crystal lattice through thermal activation and thus reduce the kinetic barriers for the formation of intermetallic Pt_(5)Ce catalysts.The prepared Ga-doped Pt_(5)Ce catalyst exhibits a higher electrochemical active surface area(81 m^(2)·gPt^(-1))and a larger mass activity(0.45 A·mgPt^(-1)at 0.9 V)over the undoped Pt_(5)Ce and commercial Pt/C catalysts.In the membrane electrode assembly test,the Ga-doped Pt_(5)Ce cathode delivers a power density of 0.98 W·cm^(-2)at 0.67 V,along with a voltage loss of only 27 mV at 0.8 A·cm^(-2)at the end of accelerated stability test.

关 键 词：P5Ce low-melting-point metal small-sized intermetallic compound catalysis fuel cells 

分 类 号：O64[理学—物理化学]