Abstract
Amorphous RuO2-Ta2O5 catalysts prepared by thermal decomposition of the precursor solution were investigated to develop a novel sensing method for HPO42− and HCO3− by electrochemical oxidation, and the catalyst formed on a titanium substrate was used as the detecting electrode. Cyclic voltammetry showed that the oxidation of both anions occurred and the onset potential of the oxidation of HPO42− was less noble than that of HCO3-, suggesting that these anions can be detected separately by changing the electrode's potential, and chronoamperometry indicated that the oxidation current density was linear to the concentration of HPO42− or HCO3−. The results revealed that the quantification of both anions is possible with this novel amorphous oxide catalyst.
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