Three-dimensional architecture of Ag/CeO2 nanorod composites prepared by dealloying and their electrocatalytic performance
Three-dimensional architecture of Ag/CeO2 nanorod composites prepared by dealloying and their electrocatalytic performance
复制标题
脱合金制备Ag/CeO2纳米棒复合材料的三维结构及其电催化性能
DOI：
10.1039/c7ra04651k
复制
发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Sun, Zhanbo
中科院分区：
文献类型：
--
作者：
Zhang, Xiaolong;Li, Guijing;Sun, Zhanbo
将快淬Al-Ag-Ce合金在NaOH水溶液中脱合金化，制备了一种新型三维结构的Ag/CeO 2纳米棒，并将其用于NaBH 4的电催化氧化。纳米棒复合物由CeO 2纳米棒和大尺寸Ag纳米颗粒组成。在573 K的空气中煅烧后，在CeO 2纳米棒骨架表面生成了大量分散性较好的Ag纳米颗粒。通过在CeO 2纳米棒上锚定小的Ag纳米颗粒，形成了边界清晰的Ag/CeO 2界面，并通过较大的导电Ag纳米颗粒将纳米棒连接起来。电化学测试结果表明，Ag/CeO 2复合材料对BH 4的氧化质量比电流是纯Ag的2.5倍。Ag/CeO 2复合材料由于其三维纳米棒结构、小Ag纳米颗粒与CeO 2纳米棒之间强的界面相互作用以及高浓度的表面氧物种而表现出增强的催化活性。
A novel three-dimensional (3D) architecture of Ag/CeO2 nanorods with high electrocatalytic activity was prepared by dealloying melt-spun Al-Ag-Ce alloys in NaOH aqueous solutions for NaBH4 electro-oxidation. The nanorod composite was composed of CeO2 nanorods and large-size Ag nanoparticles. After undergoing calcination at 573 K in air, many highly dispersed small Ag nanoparticles were generated and deposited on the surface of the CeO2 nanorod framework. Well-defined Ag/CeO2 interfaces were created via the anchoring of small Ag nanoparticles on the CeO2 nanorods, and the nanorods were connected by larger conductive Ag nanoparticles. Electrochemical measurements showed that the mass specific current of the Ag/CeO2 composites was 2.5 times higher than that of pure Ag for BH4 oxidation. The Ag/CeO2 composites exhibited enhanced catalytic activity owing to the 3D nanorod architecture, strong interfacial interactions between small Ag nanoparticles and CeO2 nanorods, and high concentrations of surface oxygen species.