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The direct conversion of CO2into CO and O2by dielectric barrier discharge (DBD) non-thermal plasma is effective with simple setup, easy on/off operation and flexibility to the CO2source. Herein, we demonstrated the frosted dielectric surface without and with ZrO2coating can significantly improve the conversion and energy efficiency of the plasma CO2decomposition in a DBD reactor, compared to the conventional un-frosted dielectric surface without ZrO2coating. The use of the frosted dielectric surface increases the dielectric capacitance, mean electron energy and micro-discharge channels, leading to increased CO2conversion and energy efficiency. The coating of ZrO2of a high dielectric constant further improves the discharge performances with further increased CO2conversion and energy efficiency. The highest energy efficiency of 7.7% was achieved within the tested conditions. The effect of CO2adsorption on ZrO2coating is negligible because of the low coating amount.

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