临界点干燥仪制备的Pt-P25的电催化析氢反应性能探究

在各种制氢工艺中,电解水是一种获得氢能源的重要途径,Pt是析氢反应(HER)中最理想的催化剂.由于Pt基材料的稀缺性和高成本限制了其大规模应用,因此迫切需要开发一种低含量、高效的铂催化剂.P25是一种晶格缺陷密度很高的混晶型TiO2,载流子浓度大,具有良好的催化效果.本文采用临界点干燥仪,以商业化混晶TiO2(P25)...

Research on Electrocatalytic Hydrogen Evolution Reaction Performance of Pt-P25 Prepared by Critical Point Drier

Among various hydrogen production processes, electrochemical water splitting is an important way to obtain hydrogen energy, and Pt is the most ideal catalyst for the hydrogen evolution reaction (HER). Nevertheless, large-scale application of Pt-based materials in HER are limited due to their scarcity and high cost, there is an urgent need to develop a low content and efficient platinum catalyst. P25 is a kind of hybrid titanium dioxide with high lattice defect density and high current carrier concentration, which has good catalytic effect. Commercially available mixed crystal TiO₂ (P25) as catalysts supported Pt (Pt-P25) were prepared by a critical point drier, the structure and morphology of catalysts were analyzed by XRD、TEM and XPS, and the electro-catalytic HER performance of Pt-P25 were explored in different critical point drying conditions. The results show that TiO₂ supported Pt atom cluster is successfully prepared by the critical point drying method. Under certain conditions, electro-catalytic HER of Pt-P25 is the best when carbon dioxide intake rate is slow, exchange rate is 7, and outlet gas heating rate is med.