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《Journal of Electrochemistry》 2018-03
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Pt/g-C_3N_4 Nanosheet for Visible Light-Induced Enhancement of Activity for Formic Acid Electro-Oxidation

SUN Yong-rong;DU Chun-yu;HAN Guo-kang;WANG Ya-jing;GAO Yun-zhi;YIN Ge-ping;Institute of Advanced Chemical Power Sources,School of Chemistry and Chemical Engineering,Harbin Institute of Technology;School of Chemistry and Chemical Engineering,Harbin Institute of Technology;  
By using graphitic carbon nitride nanosheet(g-C_3N_(4 )nanosheet)as a support,Pt/g-C_3N_(4 )nanosheet catalyst was fabricated by microwave assisted polylol process.The nanoparticles size,composition,structure and optical properties of Pt/g-C_3N_4 nanosheet were characterized by TEM,XRD,XPS and UV-Vis diffuse reflectance spectroscopy.Comparing with the catalytic activities toward formic acid electro-oxidation under dark and visible light illumination,the superior activity of Pt/g-C_3N_4 nanosheet catalyst was achieved under visible light illumination.This visible light-driven enhancement in the formic acid performance could be attributed to the plasmon-induced electron-hole separation on g-C_3N_4 with visible light illumination.The photo-generated hot electron promoted the oxidation of formic acid molecules.The current density of g-C_3N_4 nanosheet was increased under visible light illumination in the presence of formic acid.More importantly,the fast electron transfer from Pt to g-C_3N_4 nanosheet under visible light illumination adjusted the electronic structure of Pt.The"electron deficient"state of Pt could weaken the adsorption energy of CO(as a poisoning species),facilitating CO oxidation.The rapid removal of poisoning species on Pt would provide more catalytic activity sites for the oxidation of formic acid,enhancing formic acid catalytic activity.The visible light-assisted enhancement in the electrochemical formic acid activity provides a development strategy for direct formic acid fuel cells.
【Fund】: 国家自然科学基金项目(No.21376057 No.21433003)资助
【CateGory Index】: O643.36;TM911.4
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