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采用离子束溅射镀膜技术(IBS)制备Pt Cu-Ce Ox复合薄膜电极,并对膜电极进行不同温度的酸蚀处理。分析酸蚀处理温度对膜电极性能的影响,并进一步讨论薄膜表面组分、结构与催化性能的相关性。X射线衍射(XRD)和带能谱的扫描电子显微镜(SEM-EDS)结果表明,Cu掺杂和酸蚀去合金化处理均降低了Pt的晶面间距,这有助于提高Pt的电子云密度,提高膜电极的催化性能;Ce Ox的加入增强了Pt颗粒的分散度,降低Pt(111)的表面能,促进Pt(111)的择优生长;膜电极催化性能与其活性比表面积之间呈现非正比关系,相对于比表面积,表面催化主相Pt的相对浓度的影响更为重要;电化学测试结果表明,经过300℃的1 h真空热处理以及在30℃、0.5 mol·L-1的H2SO4溶液中酸蚀处理30 min后的试样,析氢活性比原样提高6.78%,电感耦合等离子体发射光谱仪(ICP-AES)数据显示,其Pt载量仅为0.115 mg·cm-2,表现出低Pt耗量高催化性能的明显特性。
Pt Cu-Ce Ox composite thin film electrodes were prepared by ion beam sputtering (IBS) technique. The electrode was etched at different temperatures. The influence of acid etching temperature on the performance of the membrane electrode was analyzed, and the relationship between the composition and the structure and the catalytic performance of the membrane surface was also discussed. The results of X-ray diffraction (XRD) and scanning electron microscopy (SEM-EDS) with energy spectrum show that Cu doping and acid-etching alloying reduce Pt interplanar spacing, which helps to improve the electron cloud of Pt Density and improve the catalytic performance of the membrane electrode. The addition of Ce Ox enhanced the dispersion of Pt particles, decreased the surface energy of Pt (111) and promoted the preferential growth of Pt (111) Non-proportional relationship, relative to the specific surface area, the relative concentration of Pt on the catalytic surface of the catalytic effect is more important; electrochemical test results show that after 1 h vacuum heat treatment at 300 ℃ and 30 ℃, 0.5 mol·L-1 H2SO4 After 30 min of acid etching treatment, the hydrogen evolution activity was 6.78% higher than that of the original sample. The ICP-AES data showed that the Pt loading was only 0.115 mg · cm-2, which showed low Pt consumption of high catalytic properties of the obvious characteristics.