FeOx Coating on Pd/C Catalyst by Atomic Layer Deposition Enhances the Catalytic Activity in Dehydrogenation of Formic Acid

作     者：李俊杰 路军岭 

作者机构：中国科学技术大学化学物理系合肥微尺度国家科学实验室能源材料化学协同创新中心中国科学院能量转换材料重点实验室合肥230026 

出 版 物：《Chinese Journal of Chemical Physics》 (化学物理学报（英文）)

年 卷 期：2017年第30卷第3期

页      面：319-324,I0002页

核心收录：

学科分类：07[理学] 

基　　金：This work was supported by the National Natural Science Foundation of China (No.51402283 and No.21473169)  One Thousand Young Talents Program under the Recruitment Program of Global Experts  the Fundamental Research Funds for the Central Universi- ties (No.WK2060030017)  and the Startup Funds from University of Science and Technology of China 

主　　题：Formic acid Hydrogen generation Atomic layer deposition FeOx coating Pd catalyst 

摘      要：Hydrogen generation from formic acid （FA） has received significant attention. The challenge is to obtain a highly active catalyst under mild conditions for practical applications. Here atomic layer deposition （ALD） of FeOx was performed to deposit an ultrathin oxide coating layer to a Pd/C catalyst, therein the FeOx coverage was precisely controlled by ALD cycles. Transmission electron microscopy and powder X-ray diffraction measurements suggest that the FeOx coating layer improved the thermal stability of Pd nanoparticles （NPs）. X-ray photoelectron spectroscopy measurement showed that deposition of FeOx on the Pd NPs caused a positive shift of Pd3d binding energy. In the FA dehydrogenation reaction, the ultrathin FeOx layer on the Pd/C could considerably improve the catalytic activity, and Pd/C coated with 8 cycles of FeOx showed an optimized activity with turnover frequency being about 2 times higher than the uncoated one. shape as a function of the number of FeOx ALD The improved activities were in a volcanocycles, indicating the coverage of FeOx is critical for the optimized activity. In summary, simultaneous improvements of activity and thermal stability of Pd/C catalyst by ultra-thin FeOx overlayer suggest to be an effective way to design active catalysts for the FA dehydrogenation reaction.