Platinum in-situ catalytic oleylamine combustion removal process for carbon supported platinum nanoparticles

作     者：Qingying Zhao Huanqiao Li Xiaoming Zhang Shansheng Yu Suli Wang Gongquan Sun Qingying Zhao;Huanqiao Li;Xiaoming Zhang;Shansheng Yu;Suli Wang;Gongquan Sun

作者机构：Division of Fuel Cells and BatteryDalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina2 University of Chinese Academy of SciencesBeijing 100049China Department of Materials ScienceJilin UniversityChangchun 130012JilinChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2020年第29卷第2期

页      面：120-125页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 07[理学] 081705[工学-工业催化] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 0702[理学-物理学] 

基　　金：the financial support by DICP Grant no.ZZBS201705。 

主　　题：Ligand removal Platinum in-situ catalytic OAm combustion Carbon supported platinum electro-catalyst ORR 

摘      要：Colloidal synthesis method such as oleylamine(OAm)-stabilized process is of great interest for obtaining uniform and highly dispersed platinum nanoparticle catalysts, yet the ligand may unavoidably inhibit their electro-catalytic performance. Thus, fully removing these ligands is critical to activate catalyst surface. Previous research of OAm removal process pointed that thermal annealing was the most effective way in comparison with other methods such as chemical washing, UV–Ozone irradiation and cyclic voltammetry sweeping, but generally resulting in undesired growth of platinum nanoparticle. Few studies concerning a more efficient ligand removal process have been published yet. In this work we proposed a platinum in-situ catalytic OAm combustion strategy to elucidate the removal mechanism of OAm ligands in thermal process and the key experimental parameters were also optimized. In addition, heat flow signal based on differential scanning calorimetry(DSC) measurement as a sensitive indicator, is suggested to reveal the ligand removal efficiency, which is much more reliable than the traditional spectroscopy.In comparison with commercial Pt/C sample, such a surface clean Pt/C electrocatalyst has shown an enhanced specific activity for oxygen reduction reaction. Our removal strategy and the evaluation method are highly instructive to efficient removal of different organic ligands.