Synergy of compress strain and antioxidant of platinum-copper for enhanced the oxygen reduction performance  

作　　者：Jun Zhang Pingjuan Liang Xinlan Xu Rong Wang Shuyue Liu Chunyuan Wang Boyu Liu Laizheng Luo Meng Jin Huan Liu Huan Yi Shi-Yu Lu 

机构地区：[1]College of Metallurgy and Materials Engineering,Chongqing University of Science and Technology,Chongqing,401331,China [2]College of Chemistry and Chemical Engineering,Chongqing University of Science and Technology,Chongqing,401331,China [3]Southwest Technology and Engineering Research Institute,Chongqing,400039,China [4]School of Physical and Mathematical Sciences,Nanyang Technological University,Singapore,637371,Singapore

出　　处：《Nano Materials Science》2025年第1期105-112,共8页纳米材料科学(英文版)

基　　金：the Young Elite Scientists Sponsorship Program by CAST(2021QNRC001);Natural Science Foundation of Chongqing(CSTB2022NSCQ-MSX0557,cstb2023nscq-msx0979);Talent Introduction of Chongqing University of Science and Technology(ckrc2021050,ckrc20230401,ckrc2021053);the Science and Technology Research Program of Chongqing Municipal Education Commission(KJQN202201532,KJQN202301542);the National Natural Science Foundation of China(22109016);Open Research Fund of CNMGE Platform&NSCC-TJ(CNMGE2023016).

摘　　要：The development of efficient and durable electrocatalysts for oxygen reduction reaction(ORR)holds a pivotal significance in the successful commercialization of proton exchange membrane fuel cells(PEMFCs)but is still challenging.Herein,we report a worm-liked PtCu nanocrystals dispersed on nitrogen-doped carbon hollow microspheres(Pt_(0.38)Cu_(0.62)/N-HCS).Benefiting from its structural and compositional advantages,the resulting Pt_(0.38)Cu_(0.62)/N-HCS catalyst delivers exceptional electrocatalytic activity for ORR,with a half-wave potential(E_(1/2))of 0.837 V,a mass activity of 0.672 A mgPt^(-1),and a Tafel slope of 50.66 mV dec^(-1),surpassing that of commercial Pt/C.Moreover,the Pt_(0.38)Cu_(0.62)/N-HCS follows the desired four-electron transfer mechanism throughout the ORR process,thereby displaying a high selectivity for direct reduction of O_(2)to H_(2)O.Remarkably,this catalyst also showcases high stability,with only a 25 mV drop in E_(1/2)after 10,000 cycles in an acidic electrolyte.Theoretical calculations elucidate the incorporation of Cu into Pt lattice induces compressive strain,which effectively tailors the d band center of Pt active sites and strengthens the surface chemisorption of O_(2)molecules on PtCu alloys.Consequently,the Pt_(0.38)Cu_(0.62)/N-HCS catalyst exhibits an improved ability to adsorb O_(2)molecules on its surface,accelerating the reaction kinetics of O_(2)conversion to*OOH.Additionally,Cu atoms,not only serving as sacrificial anode,undergo preferential oxidation during PEMFCs operation when compared to Pt,but also the stable Cu species in PtCu alloys contributes significantly to maintaining the strain effect,collectively enhancing both activity and durability.Overall,this research offers an effective and promising approach to enhance the activity and stability of Pt-based ORR electrocatalysts in PEMFCs.

关 键 词：PtCu alloy Compressive strain Oxygen reduction reaction Activity and durability Cu oxidation 

分 类 号：O643.36[理学—物理化学]