Preparation Of Gradient Pt-Based Carrier Film Electrode And Morphology Control Of Membrane Interface Holes

Platinum has a wide range of application in all walks of life because of its' higher catalytic activity,excellent corrosion,strong antioxidant and stability.However,the price of Pt is more expensive,which leads to enterprise promotion of the costs.How to decrease the Pt-loading and increase the catalytic properties to reduce the cost has become a hotspot.Therefore,the main method for Pt catalysts is adding the base metals to the platinum,which can form the new type of Pt-based catalyst.So this paper will provide a bimetallic PtCu membrane electrode catalyst which is prepared by Ion Bean Sputtering(IBS)under different deposition temperature conditions,investigating the effect of deposition temperature on bimetallic catalyst toward catalytic behaviour.The catalytic activity of the thin film catalyst was analyzed by electrochemical cyclic voltammetry(CV)and linear sweep voltammetry(LSV).The mental content,phase composition and suface morphology,were characterized by inductively coupled plasma-atomic emission spectroscopy(ICP-AES),X-ray diffraction(XRD),high resolution transmission electron microscope(HR-TEM).The duct structure of Nafion about catalyst particles was characterized by field emission scanning electron microscopy(FESEM).The PtCu/C/Nafion catalytic activity for benzene hydrogenation was tested by benzol hydro refining unit.The results show that:(1)The eletrichemical performance tends to increase with the deposition temperature,but decreases when the temperature is beyond 250?.Comparing with the C and C1 samples at room temperature,the relative maximal growth rates are 18.03%and 33.63%before and after modification,respectively.The exchange current density(i0)value increases 10.1%and 64.7%comparing the pure Pt/C sample(i0=0.006700A/cm2)at room temperature,respectively.So there is better practicability.There is higer performance when the deposition temperature is at 275 ?,and it is close to 250? after modification.Therefore,there is excellent performance when the deposition temperature is at 250?-275? for the bimetallic gradient PtCu membrane.(2)Using the three ultrasonic vibration and ultrasonic natural deposits,it can make the overall distribution homogenization degree of catalsts incresased as the fluid level declined.And also it can form the PtCu/C/Nafion membrane electrode,which the structure is compact,the catalyst particle sizes and the distribution are uniform.(3)After benzene hydrogenation tests at 0.3V,there is a high improvement for pure Pt/C at 250?(62.32%)and bimetallic gradient PtCu sample(63.83%),comparing the pure Pt/C sample at room temperature.It is improved 17.56%(room temperature)and 3.92%(250 ? deposition temperature)for bimetallic gradient PtCu membrane electrode after modification.So the effect of deposition temperature for benzene hydrogenation is bigger than post-process modification.