| 초록 |
The electrochemical conversion of CO2 to CO using solar energy is desirable for artificial photosynthesis. However, there are challenges in a large scale with high current density and stability. In here, we report a catalyst, which is composed of 3D silver dendrite structure wrapping carbon-supported using tungsten-seed (W@AgD/C), enhancing CO2 reduction(CO2R) activity and stability. The catalyst have outstanding performances, showing a 400 mA cm-2 (maximum CO partial current density) and 100h stability at 150 mA cm-2 in a zero-gap CO2 electrolyzer. The dendrite structure enhances CO2 mass-transfer and expands the grain boundaries, increasing CO2R activity which is result from the strong electric fields by the AgxCyOz layer near the surface after activation. The result of application on a stand-alone photovoltaic-electrochemical system is a 12.1% solar-to-CO efficiency at 1A. Thus, we provide good prospects for efficient large-scale solar energy storage with the synthesized catalyst. |
