Enhanced hydrogen evolution properties obtained by ultrasonic-cyclic voltammetry modification of C-supported PtCu thin film catalyst
Enhanced hydrogen evolution properties obtained by ultrasonic-cyclic voltammetry modification of C-supported PtCu thin film catalyst
复制标题
DOI：
10.1007/s12540-017-6392-7
复制
发表时间：
2017-05
影响因子：
3.5
通讯作者：
Sha Yi;Bin Yang;Zhan Zhang
中科院分区：
文献类型：
--
作者：
Sha Yi;Bin Yang;Zhan Zhang
采用离子束溅射法制备了碳载型铂-铜(铂-铜/碳)双金属催化剂，并对催化剂进行了真空热处理和超声循环伏安(US-CV)电化学刻蚀。电化学测试表明，经US-CV电化学改性后的催化剂对析氢反应表现出比纯铂更高的催化活性。扫描、透射电子显微镜和电子差示系统分析表明，后处理的催化剂表面形成了PtCu@铂的核壳结构，提高了铂的效率。透射电子显微镜分析表明，在PtCu@Pt核壳粒子表面检测到晶格压缩应变，晶格压缩变量约为1.12%。X射线光电子能谱分析证实，后处理的PtCuC的Pt4f7/2结合能为71.10 eV，比纯PtCuC(71.3 eV)降低了0.2 eV。可以推断，由于铜原子催化性能的提高，改变了铂原子的几何结构和电子结构。
Carbon-supported Pt-Cu (Pt-Cu/C) bimetallic catalyst was synthesized by Ion Beam Sputtering technology and subsequently annealed in vacuum and electrochemically etched by Ultrasonic-Cyclic Voltammetry (US-CV). Electrochemical measurements indicate that the sample was modified electrochemically by US-CV shows higher catalytic activity towards hydrogen evolution reaction than pure Pt/C. Scanning and transmission electron microscopy and electronic differential system analysis reveal that the surface of post-processed catalyst produced PtCu@Pt core-shell structure which increasing the efficiency of Pt. Transmission electron microscope analysis displays that on the surface of PtCu@Pt core-shell particles detects lattice compressive strain, the lattice compression variable is around 1.12%. X-ray photoelectron spectroscopy analysis confirms that the Pt4f7/2binding energy of the post-processed PtCu/C is 71.10 eV, decreased by 0.2 eV compared to pure Pt/C (71.3 eV). It can be inferred that the enhancement of catalytic property attribute to the Cu atoms modified the geometric structure and electronic structure of the Pt atoms.