| 초록 |
Carbon dioxide reduction is promising technology for carbon recycling. Especially, conversion of CO2 to CO is crucial because it can be further reduced to oxygenates and hydrocarbon. Among various catalyst, gold (Au) shows high selectivity to convert CO2 to CO because of its low CO binding affinity. Challenge for Au catalyst is to get high efficiency (>90 %) at low voltage (＜-0.3 V). To achieve high selectivity, we fabricated Au nanopattern by secondary sputtering lithography, which is 3D structure and has high aspect ratio (＞20) and high resolution (~15 nm). Due to these properties, pattern has high surface-to-volume ratio and is transparent (＞90 %). It is promising for photoelectrochemical cell in near future which uses solar energy along with electricity. Additionally, pattern is fabricated by Ar ion bombardment, so it has small grain size (~ 5nm), which resulted in increment of CO2 conversion efficiency. To conclude, our sample shows high CO faradaic efficiency than bulk Au. |
