Dual anchoring strategy for preparing Fe single-atom modified Pt nanoparticles as highly stable oxygen reduction electrocatalysts

被引:4
作者
Feng, Hao [1 ]
Yan, Wei [1 ]
Shi, Zhuang [1 ]
Zhuo, Hongyan [1 ]
Chen, Wenmiao [1 ]
Chen, Yanli [1 ]
机构
[1] China Univ Petr East China, Sch Mat Sci & Engn, Qingdao 266580, Peoples R China
基金
中国国家自然科学基金;
关键词
Pt nanoparticles; Fe single-atom; ORR; Mesoporous carbon hollow spheres; CORE-SHELL NANOPARTICLES; PD3PB NANOWIRE NETWORKS; PLATINUM; CARBON; PARAMETERS; NANOTUBES; EVOLUTION; ALKALINE; CATALYST; SITES;
D O I
10.1016/j.jpowsour.2024.234737
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Developing highly stable and uniformly dispersed Pt nanoparticles (NPs)-based oxygen reduction reaction (ORR) catalysts still remains an extremely difficult task due to the large-scale aggregation and migration of Pt NPs. Herein, a dual anchoring strategy was employed to prepare highly stable Pt NPs loaded uniformly on mesoporous carbon hollow spheres (MCHS) containing Fe single-atom (FeSA) active sites (PtNP-FeSA@MCHS). A combination of the mesoporous structure of MCHS with the electron transfer from Fe single-atom and Pt NPs (so called dual anchoring strategy) enables the Pt NPs anchored and uniformly dispersed over the whole matrix of FeSA@MCHS, endowing PtNP-FeSA@MCHS ultra-high ORR stability, with a decrease in half-wave potential of only 3 mV and the mass activity (MA) as well as specific activity (SA) attenuation of merely 5 % and 2 % after 20,000 cycles of the accelerated durability test (ADT), respectively, surpassing the most of Pt nanoparticles (NPs)-based ORR catalysts reported thus far. In particular, the TEM analysis for PtNP-FeSA@MCHS after the ADT revealed no significant aggregation of Pt NPs, thus showing the superior structural stability of PtNP-FeSA@MCHS. Furthermore, PtNP-FeSA@MCHS shows good activity with MA of 0.63 A mgPt(-1) and SA of 1.22 mA cm(-2), which are 4.5 and 6.8 times of 20 % Pt/C (MA = 0.14 A mg(Pt)(-1) and SA = 0.18 mA cm(-2)), respectively. This dual anchoring strategy provides a foundation for the design of Pt-based ORR catalysts with superior stability and activity.
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页数:10
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