In this study, we developed a novel way to detect CO₂ based on ion transfer processes at a triple phase junction graphite|4-(3-phenylpropyl)pyridine|aqueous electrolyte. Cobalt phthalocyanine (CoPc) readily dissolved in the organic 4-(3-phenylpropyl)pyridine phase and exhibited oxidation/reduction processes which are coupled to liquid|liquid ion transfer. In order to maintain charge neutrality, each one-electron oxidation (reduction) process is coupled to the expulsion (insertion) of cations (here Li⁺, Na⁺, K⁺, Ca²⁺ and Mg²⁺). The introduction of CO₂ into the triple phase boundary system resulted in different potential shifts for all cation types studied. The range of cations studied allowed effects of cation sizes and CO₂ binding to the organic phase to be explored. 

Figure. 1  Cyclic voltammogram at 0.05 V s^-1 for the oxidation/reduction of 80 nL deposit of a solution of CoPc (84 mM) in 4-(3-phenylpropyl)pyridine, immobilized onto a 4.9 mm diameter basal plane pyrolytic graphite electrode, and immersed in 0.1 M NaClO₄, in the absence and presence of carbon dioxide.

[1]  M. J. Bonne, C. Reynolds, S. Yates, G. Shul, J. Niedziolka, M. Opallo, F. Marken, New J. Chem. 30 (2006) 327-334.

[2] F. Marken, K. J. McKenzie, G. Shul, M. Opallo, Faraday Discuss. 129 (2005)  219-229.

1. PRESENTATION: Carbon Dioxide Sensing Systems Based On Processes At Triple Phase Boundary Interfaces, JPEG image data, JFIF standard 1.02, comment: "\210\206\210", 0MB

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