화학공학소재연구정보센터
International Journal of Hydrogen Energy, Vol.44, No.21, 10646-10652, 2019
Pt-CeO2/TiN NTs derived from metal organic frameworks as high-performance electrocatalyst for methanol electrooxidation
Metal organic frameworks (MOFs) have attracted tremendous attention in recent years owing to their high-specific surface area (SSA) and variable porous structures. Owing to the strong interaction between Pt and CeO2, Pt combined steadily with CeO2. Furthermore, the surface of CeO2 can activate water to produce hydroxyl groups, which can accelerate the removal of catalytic intermediate CO. But the bad conductivity of metal oxide is still a huge obstacle. More importantly, utilizing TiN with excellent conductivity as support can strengthen conductivity of catalyst and improve catalytic activity. Herein, a novel Pt-CeO2/TiN Nanotubes (TiN NTs) catalysts derived from Ce-MOF was fabricated for the first time. In the synthesis process of the targeted catalyst, the compounds of Ce-MOF and TiN NTs was prepared via the hydrothermal method and post-nitriding treatment, and implemented as the Pt support. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), nitrogen adsorption/desorption and electrochemical measurements were carried out to characterize the catalyst. Notably, the peak current density of Pt-CeO2/TiN NTs (0.67 A mg(-1)Pt) was approximately 3 times higher than Pt/C (0.28 A mg(-1)Pt) during methanol oxidation test, showing the exceptional properties toward methanol oxidation reaction (MOR). Remarkably, electrochemical testing data verified the superior tolerance to CO and enhanced catalytical activity of Pt-CeO2/TiN NTs and it could be attributed to the porous structures and the interaction between TiN NTs and CeO2. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.