High temperature corrosion of carbon/carbon composites in Zr–Ti melts during liquid metal infiltration

Zeng, Yi; Xiong, Xiang; Wang, Dini; Wu, Liang; Chen, Zhaoke; Sun, Wei; Wang, Yalei; Xiao, Ping

doi:10.1016/j.corsci.2015.05.014

Cited by 12 publications

(1 citation statement)

References 31 publications

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“…However, in most of the cases, the promotion of Pt to the carbon support oxidation is fairly limited or weak due to the few contact sites between the metal–support in a typical point-contact way where the spherelike Pt NP is dispersed on carbon nanospheres, making it difficult to present or directly observe the carbon oxidation process. As results, the phenomenon of the carbon oxidation mainly arises by guesswork while not by direct observation in the previous report. − Herein, a novel method to track the behavior of carbon oxidation catalyzed by Pt is devised in light of a unique graphitic carbon covering layer on Pt NPs under the electrochemical conditions. The carbon layer can greatly increase the amount of metal–support contact sites; thus the radical oxidation of carbon on Pt can be observed directly by the thinning of the carbon layers presented in HR-TEM images.…”

Section: Introductionmentioning

confidence: 99%

Observable Electrochemical Oxidation of Carbon Promoted by Platinum Nanoparticles

Kou

Cheng

et al. 2016

ACS Appl. Mater. Interfaces

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The radical degradation of Pt-based catalysts toward oxygen reduction reaction (ORR), predominantly caused by the oxidation of carbon supports, heavily blocks the commercialization of polymer electrolyte membrane fuel cells (PEMFCs). As reported, the electrochemical oxidation of carbon could be accelerated by Pt catalysts; however, hitherto no direct evidence is present for the promotion of Pt catalysts. Herein, a unique ultrathin carbon layer (approximately 2.9 nm in thickness) covered Pt catalyst (Pt/C-GC) is designed and synthesized by a chemical vapor deposition (CVD) method. This magnifies the catalysis effect of Pt to carbon oxidation due to the greatly increased contact sites between the metal-support, making it easy to investigate the carbon oxidation process by observing the thinning of the carbon layer on Pt nanoparticles from TEM observations. Undoubtedly, this finding can better guide the structural design of the durable metal catalysts for PEMFCs and other applications.

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