Revisiting why DBD can generate O3 against the thermodynamic limit
Kim H.-H., Abdelaziz A. A., Teramoto Y., Nozaki T., Kim D.-Y., Brandenburg R., Schiorlin M., Hensel K., Song Y.-H., Lee D.-H., Kang W.-S., Mizuno A.
Int. J. Plasma Environ. Sci. Technol. 17 (2), e02004, 20 pp (2023)
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Abstract: This short review aims to provide a general perspective on ozone formation and the brief history of great German inventor Verner von Siemens who invented the prototype ozonizer. The main structure of the Siemens ozonizer is still remaining as the de facto model in large-scale applications. Especially, this review focuses on the thermodynamic aspect of ozone formation in dielectric barrier discharge (DBD) which is fundamental but yet to be puzzling to newcomers in plasma chemistry. As is often mentioned in the chemistry of nonthemal plasmas, non-equilibrium reaction initiated by high energy electrons enable the dissociation of oxygen molecules at ambient temperature despite of the highly endothermic process. Once atomic oxygen is formed, then it spontaneously combines with oxygen molecule to form ozone with releasing heat. This elaborate coupling of the nonequilibrium with equilibrium processes leads to the O3 formation against the thermodynamic limitation.
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