Journal
ADVANCED ENERGY MATERIALS
Volume 12, Issue 32, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202201600
Keywords
bimetallic ZIFs; dual template; oxygen reduction reaction; PtCo nanoparticles; self-confinement
Categories
Funding
- Guangxi Science and Technology Project [AA17204083, AB16380030]
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A self-confined method for synthesizing highly dispersed PtCo-alloy on Co, N co-doped mesoporous carbon (PCN-MC) was developed via a dual-template strategy. By adjusting the feeding-ratio, the alloying degree and nanoparticle size were optimized to achieve outstanding oxygen reduction reaction activity and durability.
Traditional calcination usually causes sintering of Pt, which diminishes Pt exposure in proton exchange membrane fuel cell (PEMFC) electrodes. In the present work, a facile self-confined method for synthesizing highly dispersed PtCo-alloy on Co, N co-doped mesoporous carbon (PCN-MC) is developed via a dual-template strategy. Owing to the co-confined effect of Zn in the bimetallic zeolite-based imidazolate framework (ZIF) and Mg(OH)(2) template, ultra-fine 2.7 nm PtCo-alloy with 2-3 atomic-layer Pt-skin nanoparticles are obtained. By adjusting the Co/Zn feeding-ratio in the bimetallic ZIF at 8/7, the alloying degree and nanoparticle size are optimized to achieve an outstanding oxygen reduction reaction activity with a high mass activity (MA) of 0.956 A mg(Pt)(-1) in 0.1 m HClO4, about 7.5-fold of that of commercial Pt/C. Furthermore, notable durability is also achieved with 81% retention of the initial MA after 30k cycles conducted between 0.6-1.0 V (versus reversible hydrogen electrode). These features are also verified by a H-2-Air fuel cell test with an excellent combination of mass activity, power density, and durability. This strategy provides a feasible route for the large-scale synthesis of highly-dispersed PtCo-alloy catalysts.
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