Zhang Liqiu, Liu Lichun, Wang Hongdan, Shen Hongxia, Cheng Qiong, Yan Chao, Park Sungho
College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China.
Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea.
Nanomaterials (Basel). 2017 May 3;7(5):103. doi: 10.3390/nano7050103.
This work reports on the electrodeposition of rhodium (Rh) nanowires with a controlled surface morphology synthesized using an anodic aluminum oxide (AAO) template. Vertically aligned Rh nanowires with a smooth and coarse morphology were successfully deposited by adjusting the electrode potential and the concentration of precursor ions and by involving a complexing reagent in the electrolyte solution. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses were used to follow the morphological evolution of Rh nanowires. As a heterogeneous electrocatalyst for hydrogen evolution reactions (HER), the coarse Rh nanowire array exhibited an enhanced catalytic performance respect to smooth ones due to the larger surface area to mass ratio and the higher density of catalytically active defects, as evidenced by voltammetric measurements and TEM. Results suggest that the morphology of metallic nanomaterials could be readily engineered by electrodeposition. The controlled electrodeposition offers great potential for the development of an effective synthesis tool for heterogeneous catalysts with a superior performance for wide applications.
这项工作报道了使用阳极氧化铝（AAO）模板合成具有可控表面形态的铑（Rh）纳米线的电沉积过程。通过调节电极电位、前驱体离子浓度以及在电解液中加入络合剂，成功地制备了具有光滑和粗糙形态的垂直排列的Rh纳米线。利用扫描电子显微镜（SEM）和透射电子显微镜（TEM）分析来跟踪Rh纳米线的形态演变。作为析氢反应（HER）的非均相电催化剂，粗糙的Rh纳米线阵列由于具有更大的表面积与质量比以及更高密度的催化活性缺陷，相对于光滑的Rh纳米线阵列表现出增强的催化性能，这通过伏安测量和TEM得到了证实。结果表明，金属纳米材料的形态可以通过电沉积很容易地进行调控。可控电沉积为开发一种有效的合成工具以制备具有优异性能且适用于广泛应用的非均相催化剂提供了巨大潜力。
