| 초록 |
Electrochemical CO2 reduction to fuels is one of the significant challenges in fossil fuel depletion issue. Here, we report a structural design for the efficient nanostructured electrocatalysts via optical advanced nanopatterning. We demonstrate a hierarchically porous gold nanostructure consisting of ordered macroporous network and random nanopores using three-dimensionally patterned template. The electrochemical activity show different based on the mass transport in a flat, nanoporous, and hierarchically nanoporous gold. The hierarchically porous gold shows the highest CO selectivity of 51.7 % at the very low overpotential of 0.08 V. The resulting CO gas easily escapes through the macroporous network, which allows the entire surface to participate in the CO2 reduction, and the nanopores increase an electrochemical surface area. Furthermore, the thick hierarchically porous gold maximizes the CO production due to low impedance even increasing thickness. |
