Abstract
The potentiometric response of 100-nm spherical K1.3Mn8O16 particles versus K+ ions has been studied in aqueous media using a polymeric technology. The stoichiometry of this material evolves in potassium nitrate solution towards K1.08Mn8O16. A stable and reversible response has been obtained with a sensitivity of 47 mV dec−1 in the range from 8 × 10−5 to 1 mol·L−1, and a rather good selectivity towards Li+, Na+, Mg2+ and Ca2+ \(\left( {{\text{log K}}_{{{{\text{K}}^{\text{ + }} } \mathord{\left/ {\vphantom {{{\text{K}}^{\text{ + }} } {{\text{X}}^{n + } }}} \right. \kern-\nulldelimiterspace} {{\text{X}}^{n + } }}} \approx - {\text{3}}} \right)\). We assume that this potentiometric response is the result of the ability of K1.08Mn8O16 to specifically adsorb K+ ions.
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The authors thank Ghislain Binotto for his valuable technical help on the B.E.T. measurements.
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Fig. S1
XRD diffractogram of the precipitate recovered corresponding to the birnessite structure of formula K0.5 − x Mn2O4·1.5H2O (S.E.M. pictures of the precipitate in inset) (DOC 1.24 MB)
Fig. S2
N2 adsorption/desorption isotherm curve recorded at 77 K for the as-prepared K1.3Mn8O16 powder (DOC 110 KB)
Fig. S3
Equilibrium potential of a K1.08Mn8O16-based plastic composite electrode as a function of the logarithm of the cadmium ion activity (DOC 64.0 KB)
Fig. S4
Cyclic voltamperograms recorded at different scan rates (from 0.1 to 3 mV s−1) using a K1.08Mn8O16/C plastic composite electrode in an aqueous 1 mol l−1 KNO3 electrolyte (DOC 1.19 MB)
Fig. S5
a Dependence of pre-peak current as a function of scan rate. b Dependence of (I peak − I capacitif) as a function of square root scan rate (DOC 3.13 MB)
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Sauvage, F., Tarascon, JM. & Baudrin, E. Preparation and electrochemical properties of nano-sized cryptomelane particles for the formation of potentiometric potassium ion sensors. Microchim Acta 164, 363–369 (2009). https://doi.org/10.1007/s00604-008-0067-5
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DOI: https://doi.org/10.1007/s00604-008-0067-5