|Wednesday, November 24|
Design and Electrochemical Study of Nanoporous Gold for Sensing and Environmental Applications
* Aicheng Chen, Electrochemical Technology Centre, Department of Chemistry, University of Guelph, Canada
Gold-based nanomaterials have received increasing attention for a wide range of energy, environmental, and sensing applications. This is due to their unique physicochemical properties, chemical robustness, and some distinct catalytic activities. Recently, my research team has designed and synthesized a variety of gold-based nanostructured materials. For this presentation, I will focus mainly on the synthesis and modification of nanoporous Au electrodes, as well as their promising sensing and environmental applications. Mercury (Hg(II)) poses serious risks for human health and the environment; thus, it is of critical importance to develop a facile approach for its sensitive detection. A nanoporous gold (NPG) microelectrode was fabricated via an electrochemical alloying/dealloying process and modified with FeOOH nanoflakes. The resulting FeOOH/NPG microelectrode demonstrated excellent performance for the detection of Hg(II). The critical roles of Au nanomaterials in electrochemical sensing will be discussed. Furthermore, there is a growing interest in the development of advanced catalysts for the electrochemical reduction of carbon dioxide (CO2) toward addressing rapidly intensifying climate change issue. Our studies revealed that three-dimensional nanoporous Au network structures exhibited robust catalytic activities for the efficient electrochemical reduction of CO2 to CO. The significant impacts of Au nanostructured surfaces for the electrochemical reduction of CO2 will also be highlighted.