Over the past two centuries, global annual CO2 emissions have increased by approximately 40 billion tons, becoming the main cause of climate change. To address this pressing issue, many strategies have been developed to reduce atmospheric CO2 concentration, collectively known as Carbon Capture, Utilization, and Storage (CCUS). [1] Among these, the electrochemical reduction of CO2 (ECO2RR) stands out as a promising approach, converting CO2 into reusable carbon-based products with oxygen as the only by-product. However, a significant challenge remains in developing catalysts that exhibit both high activity and selectivity. This thesis investigates the synthesis and characterization of bismuth-based (Bi-based) catalysts for the electrochemical production of formate.