1. Tuning oxygen vacancy in SnO2 inhibits Pt migration and agglomeration towards high-performing fuel cells.
- Author
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Li, Shenzhou, Liu, Junyi, Liang, Jiashun, Lin, Zijie, Liu, Xuan, Chen, Yuan, Lu, Gang, Wang, Chengliang, Wei, Peng, Han, Jiantao, Huang, Yunhui, Wu, Gang, and Li, Qing
- Subjects
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OXYGEN reduction , *TIN oxides , *DENSITY functional theory , *POWER density , *ACTIVATION energy , *CARBON nanotubes , *PROTON exchange membrane fuel cells , *FUEL cells - Abstract
The serious durability concerns of carbon supported Pt electrocatalysts for oxygen reduction reaction (ORR) have strictly limited the commercialization of fuel cells. Herein, cable-like carbon nanotubes (CNTs)@SnO 2 core@shell supports with regulable electronic metal-support interaction (EMSI) are designed for Pt nanoparticles (NPs) as ORR catalysts. Impressively, the best-performing Pt-CNT@SnO 2 catalyst with optimized d- band center achieves an excellent activity (mass activity (MA) of 0.68 A mg Pt −1 at 0.9 V iR-free and peak power density of 1618 mW cm−2) and record-high durability in H 2 -O 2 fuel cells (9.2 % MA and 8 % power density loss after 5k cycles under 1.0–1.5 V) among the reported Pt-based catalysts, which is also superior to the U.S. DOE 2025 targets. Density functional theory (DFT) calculations reveal that the strong metal-support bonding interaction (SMSBI) endows much larger adhesion energy and migration barrier towards Pt atoms compared to carbon supports, leading to the extraordinarily high stability in fuel cells. [Display omitted] • The Pt-CNT@SnO 2 catalyst demonstrates the best stability among reported Pt-based ORR catalysts under high potential regions. • Strong metal-support bonding interaction (SMSBI) between Pt and SnO 2 is able to stabilize Pt NPs against migration/agglomeration. • The d -band center of Pt is optimized by regulating the electronic metal-support interaction (EMSI). [ABSTRACT FROM AUTHOR]
- Published
- 2023
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