Redox Chemistry Driven by Atmospheric Pressure Plasma Jet

Electrochemistry underpins numerous commercially important processes ranging from energy generation to sensors and coating deposition. A common and –so far– essential feature of all these processes involve a redox active species dissolved in a solvent which serves to allow charge exchange between electrodes. Rather than being inert, the solvent is without exception redox-active at extreme potentials and thus restrict the breadth of observable reactions to a narrow potential window of approx. -2.5 to +2.5 V vs. NHE. Using gaseous plasma, the limitation of a solvent is eliminated.1&2 With the advent of new accessible approaches to form stable plasmas, these electrically conducting gases are attracting some significant interest and are now being investigated as electrochemical environments.
Atmospheric pressure plasma jets3&4 are convenient plasma sources which can be stable and present a medium which can be considered as an electrode, due to the presence of electrons or an electrolytes, due to the electrical conduction. In this presentation I will explore the use of APPJ for reduction of surface oxide coatings and material synthesis.5-7

References
1. Rumbach, P.; Bartels, D. M.; Sankaran, R. M.; Go, D. B., The solvation of electrons by an atmospheric-pressure plasma. Nature Communications 2016, 6, 7248.
2. Elahi, A.; Fowowe, T.; Caruana, D. J., Dynamic Electrochemistry in Flame Plasma Electrolyte. Angewandte Chemie-International Edition 2012, 51 (26), 6350-6355.
3. Ratcliffe, L.V., et al., Surface analysis under ambient conditions using plasma-assisted desorption/ionization mass spectrometry. Analytical Chemistry, 2007. 79(16): p. 6094-6101.
4. Golda, J., et al., Concepts and characteristics of the 'COST Reference Microplasma Jet'. Journal of Physics D-Applied Physics, 2016. 49(8).
5. Sener, M. E., Quesada Cabrera, R., Parkin, I.P., Caruana, D. J., Facile formation of black titania films using an atmospheric-pressure plasma jet, Green Chemistry 2022, 24, 2499-2505.
6. Sener, M. E., Palgrave, R., Quesada Cabrera, R., Caruana, D. J., Patterning of Metal Oxide thin Films using H2/He Atmospheric Pressure Plasma Jet. Green Chemistry 2020, 22, 1406-1413.
7. Sener, M. E.; Caruana, D. J., Modulation of copper(I) oxide reduction/oxidation in atmospheric pressure plasma jet. Electrochemistry Communications 2018, 95, 38-42.