Harnessing the light: The role of Polyoxometalates porphyrin based metal organic framework in CO2 reduction

Abstract

The Photocatalytic reduction of CO₂ to formic acid represents a promising strategy for mitigating the CO₂ emission. In the current study, we use the Metal organic framework (MOFs) namely (MOF@VP) incorporated with Zn (II) and redox-active Vanadium centers V^(V)/V^(VI) for CO₂ reduction. Thermogravimetric analysis (TGA) and FT-IR spectroscopy confirmed efficient CO₂ adsorption with a maximum adsorption capacity of 0.020 mmol/g and a desorption rate of 20 %. The Photocatalytic CO₂ reduction mechanism was investigated, demonstrating that MOF@VP facilitates the conversion of CO₂ to formic acid via electron transfer with the TEOA (Tri-ethanolamine) as a sacrificial reagent. Cyclic voltammetry revealed enhanced electrochemical activity in the presence of CO₂ further supporting the catalytic reduction mechanism. GC–MS analysis confirmed the formation of formic acid as a dominant product. The stability and Regeneration tests showed that the MOF@VP retained its efficiency and thermal stability after multiple cycles. These findings highlight the potential of using MOF@VP as a robust and efficient catalyst for CO₂ reduction, addressing key challenges in catalyst performance and longevity.