【摘 要】
：
Colloidal synthesis method such as oleylamine(OAm)-stabilized process is of great interest for obtain-ing uniform and highly dispersed platinum nanoparticle catalysts,yet the ligand may unavoidably in-hibit their electro-catalytic performance.Thus,fully r
【机 构】
：
Division of Fuel Cells and Battery,Dalian National Laboratory for Clean Energy,Dalian Institute of C
论文部分内容阅读
Colloidal synthesis method such as oleylamine(OAm)-stabilized process is of great interest for obtain-ing uniform and highly dispersed platinum nanoparticle catalysts,yet the ligand may unavoidably in-hibit 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 effec-tive 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 sig-nal 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 en-hanced specific activity for oxygen reduction reaction.Our removal strategy and the evaluation method are highly instructive to efficient removal of different organic ligands.
其他文献
The catalytic conversion of CO2 to fuels or chemicals is considered to be an effective pathway to mitigate the greenhouse effect.To develop new types of efficient and durable catalysts,it is critical to identify the catalytic active sites,surface intermed
Lithium(Li)metal is considered as one of the most promising anode materials to build next-generation high-energy-density batteries.Nonetheless,dendritic Li deposition has dramatically hindered the prac-tical applications of Li metal batteries(LMBs).Unifor
The effect of the Al2O3 structure on the performance of Pt/Ga/Al2O3 catalysts is investigated for the direct dehydrogenation of propane.The study unveils that the structure of Al3+determines the bulk structure of catalysts,particularly a high content of c
Molybdenum oxide (MoOx) is a commonly used hole extraction material in organic photovoltaics.The MoOx interlayer is deposited typically via thermal evaporation in vacuum.To meet the need for roll-to-roll manufacturing,solution processing of MoOx without p
Lithium(Li)metal is a promising anode for the next generation high-energy-density batteries.However,the growth of Li dendrites,low coulombic efficiency and dramatic volume change limit its development.Here,we report a new synthetic poly-dioxolane(PDOL)app
Metallic Li is a promising anode material for high energy density batteries but it suffers from poor sta-bility and formation of unsafe dendrites.Previous studies demonstrated that 3D metal foams are able to improve the stability of Li metal but the prope
For designing batteries with high-rate and long-life,electronic/ionic transport and reaction must be uni-fied for metal oxide electrodes.However,it remains challenging for effectively integrating the whole sub-strate/active materials/electrolyte interface
Recently,two dimensional InSe attracts great attentions as potential hydrogen production photocatalysts.Here,comprehensive investigations on the hydrogen evolution reaction activity of InSe monolayer with 3d transition metal doping and biaxial strain were
The α phase Mo carbide has been widely investigated recently for its high activity in hydrogen production from water gas shift(WGS)reaction.However,high loading of noble metals as well as high economic and environmental cost derived from high-temperature
Hydrogen has been deemed as one of the most efficient en-ergy carriers for a broad variety of industrial applications[1,2].Large-scale,low-cost hydrogen production,safe storage and de-livery represent a tremendous technological challenge and have become a