Publication date: 28th August 2024
Highly porous ZIF-8 and ZIF-67 synthesized by an environmentally friendly steam-assisted dry-gel technique are investigated as potential catalysts for electrochemical reductive reactions. The synthesis conditions play a crucial role in the growth of the metal-organic frameworks (MOFs). Tuning water content, in particular, significantly influences the morphological and structural properties of ZIF-8. These properties show significant effects in CO2 electroreduction, producing syngas with different CO: H2 ratios. The CO selectivity changed by variation in the volume of water during the synthesis and significantly affects the crystal size and morphology of the ZIF-8 particles. An optimum CO selectivity of 50% is obtained at -1.2 VRHE by increasing the water content to 20mL during the dry-gel synthesis. The tunability of CO selectivity influenced by the synthesis conditions and the reductive potential used during the CO2 electroreduction process is advantageous for producing syngas in different CO: H2 ratios. In addition, despite exhibiting similar textural and structural properties, ZIF-8 and ZIF-67 show distinctive CO2 electroreductive performance, which is assigned to the vital role of their respective metal center.
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