| 초록 |
We present nanostructured electrocatalysts for efficient electrochemical reactions including water splitting reactions and CO2 reduction reactions. To design efficient electrocatalysts, it is important to modify electrocatalysts to reduce overall overpotentials, comprised of activation, concentration, and bubble overpotential. Nanostructures are well-known to reduce activation overpotential by providing more electrochemically active sites (ECSA). Here, we present various nanostructured electrocatalysts for water splitting reactions and CO2 reduction reactions. Firstly, we demonstrate efficient NiFe inverse opal nanoporous electrocatalysts for water splitting reactions. Inverse opal is a network of hexagonally closed packed voids. With high ECSA and controlled morphology, our NiFe inverse opal show ~ 160 mV overpotential reduction for water electrolysis. In addition, we report a simply electrochemical process to form Au nanostructure for efficient and selective CO2 reduction. We will discuss the morphology evolution of Au nanostructures from the electrochemical process and its role on CO2 reduction performance. |
