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Báo cáo hóa học: " Facile template-free synthesis of pine needle-like Pd micro/nano-leaves and their associated electro-catalytic activities toward oxidation of formic acid"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Facile template-free synthesis of pine needle-like Pd micro/nano-leaves and their associated electro-catalytic activities toward oxidation of formic acid | Zhou et al. Nanoscale Research Letters 2011 6 381 http www.nanoscalereslett.eom content 6 1 381 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Facile template-free synthesis of pine needle-like Pd micro nano-leaves and their associated electro-catalytic activities toward oxidation of formic acid Rong Zhou1 2 Weiqiang Zhou1 3 Hongmei Zhang1 2 Yukou Du 1 Ping Yang1 Chuanyi Wang2 and Jingkun Xu3 Abstract Pine needle-like Pd micro nano-leaves have been synthesized by a facile template-free electrochemical method. As-synthesized Pd micro nano-leaves were directly electrodeposited on an indium tin oxide substrate in the presence of 1.0 mM H2PdCl4 0.33 M H3PO4. The formation processes of Pd micro nano-leaves were revealed by scanning electron microscope and further characterized by X-ray diffraction and electrochemical analysis. Compared to conventional Pd nanoparticles as-prepared Pd micro nano-leaves exhibit superior electrocatalytic activities for the formic acid oxidation. Introduction Energy storage devices including fuel cell Li-batteries etc. have been developing especially today 1 2 . Direct formic acid fuel cell has been receiving much attention as one of the most attractive energy sources 3 . Palladium Pd was found to show superior catalytic activity for formic acid electrooxidation compared with Pt-based catalysts 4 5 . Considerable efforts have currently been directed to developing novel Pd catalysts. Due to high-surface area and other unique physicochemical properties nano-catalysts are known to have a significant effect on promoting the electro-oxidation of formic acid. Well-controlled nanostructures are thereby essential for achieving high efficient catalysts used in fuel cells. From this prospect Pd nanoparticles with a variety of shapes have been explored such as microspheres 6 polygonal nanoparticles 7 8 nanotubes 9 nanothorns 10 nanorods 11 and nanowires 12-15 . Sun et al. reported the efficiency of formic acid .