Effective CO₂ Decomposition in a Nonthermal Atmospheric Pressure Plasma Jet System Coupled with CuO Catalysts

Plasma‐assisted CO 2 decomposition is a promising strategy for mitigating CO 2 emissions. This study integrates a nonthermal atmospheric pressure plasma jet (NTAPPJ) system with CuO catalysts to enhance CO 2 conversion, selectivity, and energy efficiency through synergistic plasma–catalyst interactions. Optimization of discharge power and CO 2 flow rate reveals that higher power increases CO output but reduces energy efficiency, while elevated flow rates improve CO yield but decrease conversion rates. Optimal conditions (100 W, 10 sccm CO 2 flow rate) yield 37.98% conversion and 0.73% energy efficiency, with stable performance over 8 h. Experiments isolating photocatalytic and thermal catalytic contributions identify oxygen vacancies in CuO as active sites facilitating CO 2 adsorption and activation. These findings establish NTAPPJ‐CuO systems as an innovative approach to plasma–catalyst CO 2 decomposition, offering new insights into plasma–catalysis mechanism.