Quantitative Analysis of Formate Production from Plasma-Assisted Electrochemical Reduction of CO₂ on Pd-Based Catalysts

Abstract

The escalating levels of atmospheric CO2, primarily attributed to human activities, underscore the urgent need for innovative solutions to mitigate environmental challenges. This study delves into the electrochemical reduction of CO2 as a promising avenue for sustainable carbon capture and utilization. Focused on the formation of formate (HCOO−/HCOOH), a high-value product, the research explores the integration of nonthermal plasma (NTP) with electrochemical processes—an approach rarely studied in existing literature. A comprehensive investigation involves varying parameters such as plasma discharging voltage, carrier gas, discharging mode, electrolysis voltage, polarity, and plasma type. The electrochemical tests employ a 10 wt.% Pd/C catalyst, and formate production is quantitatively analyzed using NMR. Results reveal that NTP significantly enhances CO2 reduction, with key factors influencing formate yield elucidated. The study reveals the complexity of CO2 electrochemical reduction, providing novel insights into the synergistic effects of NTP. These findings contribute to advancing sustainable technologies for CO2 utilization, paving the way for more efficient and environmentally friendly processes in the pursuit of a carbon-neutral future.

Keywords

• formate
• electrochemical CO₂ reduction
• plasma
• Pd catalyst