A study on the effect of selected process parameters in a jet diffusion flame for Pt nanoparticle formation

作者：Roller Justin M^*; Kim Siwon; Kwak Tony; Yu Haoran; Maric Radenka

来源：Journal of Materials Science, 2017, 52(16): 9391-9409.

DOI：10.1007/s10853-017-1101-y

• Acac
• Droplet Size
• Equivalence Ratio
• Diffusion Flame
• Exit Velocity

Pt is used in many catalytic applications from three-way catalysts to fuel cells. Particle size and morphology are key parameters that influence the electrocatalytic activity. Flame synthesis is an efficient and continuous manufacturing route capable of producing Pt nanoparticles with desirable catalytic properties. In order to understand the effect of the forced oxidant, solvent composition, and quench rate on nanoparticle formation, a systematic study of process parameters using Pt was undertaken. Reactive spray deposition technology was used as the synthesis platform. In order to obtain a tight control of the Pt size, it was found that the fuel must contain a sufficient enthalpy of combustion and appropriate propane content. The fuel must be mixed adequately to form a turbulent diffusion flame and must create conditions where unwanted Pt coarsening cannot occur. From this study, the conditions that favor this morphology require an O-2 flow rate setting of 6.89 L/min or higher, a propane content of 20 wt%, and no quenching. Electrochemical data show decreasing electrochemical surface area (75-36 m(2)/g(Pt)), increasing mass activity (120-610 mA/mg(Pt)), and increasing specific activity (150-1350 mu A/cm(Pt)(2)) with increasing oxidant flow.

• 出版日期2017-8