氢气泡制备枝晶状多孔钯银薄膜及其催化性能（英文）  

Hydrogen Bubble Templated Co-deposition of Dendritic Porous PdAg Films and Electrocatalytic Activity

作　　者：郭快乐 连利仙[1,2] 刘颖 陈静[1] Guo Kuaile;Lian Lixian;Liu Ying;Chen Jing(Sichuan University,Chengdu 610065,China;Key Laboratory of Advanced Special Materials & Technology,Ministry of Education,Chengdu 610065,China)

机构地区：[1]四川大学,四川成都610065 [2]先进特殊材料与技术重点实验室,四川成都610065

出　　处：《稀有金属材料与工程》2019年第8期2441-2446,共6页Rare Metal Materials and Engineering

基　　金：Scientific and Technical Program of Sichuan Province,China(2016GZ0225)

摘　　要：通过氢气泡动态模板法制备了具有多孔枝晶壁的钯银合金薄膜,微米级的大孔和枝晶间的间隙提供了反应过程中的介质传输通道。调节硝酸钯和硝酸银的配比制备了不同成分的钯银合金薄膜且研究了银的添加对催化性能的影响。循环伏安(CV)曲线表明钯银合金具有高的催化活性且银的添加可提高单位质量钯的催化活性,其中多孔Pd51Ag49的催化电流密度为0.49 A/mg,是多孔钯的1.47倍。X射线光电子能谱(XPS)结果说明钯银薄膜催化活性的提高可归因于钯银合金形成时银原子进入钯晶格间隙引起的钯电子结构的改变,X射线衍射(XRD)谱图和元素面扫(EM)结果也说明了合金的形成。PdA g films with self-supported porous dendritic walls were fabricated by a hydrogen dynamic template method, in which transport channels could be provided by the micron-sized pores and the interstices between the dendrites.Different composition PdA g catalysts were obtained by adjusting the proportion of Pd(NO3)2 to AgNO3 and the effect of the addition of Ag on the catalytic performance for ethanol was also studied. The cyclic voltammetry(CV) curves show that PdAg films possess high catalytic activity for ethanol and the addition of Ag significantly increases the mass-normalized catalytic activity of Pd. The mass-normalized catalytic current density of porous Pd51 Ag49 is 0.49 A/mg, and it is estimated as 1.47 times as that of porous Pd. X-ray photoelectron spectroscopy(XPS) study indicates that the enhancement of the catalytic activity of PdAg films could be ascribed to the change of the Pd electronic structure when Ag atoms are embedded into the Pd lattice to form PdAg alloy as shown in X-ray diffraction(XRD) and element analysis mapping(EM) results.

关 键 词：氢气泡模板 多孔枝晶 催化性能 钯银薄膜 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TQ426[化学工程]