| 초록 |
An appealing option for the conversion of solar energy to fuels is the electrochemical reduction of CO2 using water as the source of hydrogen. It has been known that poly-Cu is prone to produce C1 products, mainly methane in aqueous solution. The product selectivity of such conversion can be affected by the electrolyte composition including anions and cations. Nanostructuring of polycrystalline copper surfaces via electrochemical cycling in the presence of different halide anions in the electrolyte allows for a suppression of methane and an enhancement of ethylene formation. On the other hands, cations have direct influence on CO2 reduction activity. Increasing the size of mono-valent cations can increase the selectivity and activity to ethylene by lowering of pKa of deprotonation of the hydrated cations at the cathode, which facilitates hydrogenation of the reaction intermediates. |
