Abstract
A cobalt-iron alloy thin-film electrode-based electrochemical hydrogen-phosphate-ion sensor was prepared by electrodepositing on an Au-coated Al2O3 substrate from an aqueous solution of metal-salts. The use of a cobalt-iron alloy electrode greatly improved the hydrogen-ion sensor response performance, i.e., the sensor worked stably for more than 7 weeks and showed a quick response time of several seconds. Among the cobalt and iron alloy systems tested, the electrodeposited Co58Fe42 thin-film electrode showed the best EMF response characteristics, i.e., the sensor exhibited a linear potentiometric response to hydrogen-phosphate ion at the concentration range between 1.0 × 10–5 and 1.0 × 10–2 M with the slope of –43 mV/decade at pH 5.0 and at 30℃. A sensing mechanism of the Co-based potentiometric hydrogen-phosphate ion sensor was proposed on the basis of results of instrumental analysis.
Highlights
Phosphate is an important element that is used widely for various industrial applications such as metal plating and food processing
Xiao et al reported that a cobalt metal electrode exhibited good potentiometric response and selectivity to dihydrogen-phosphate ion ( H2PO4 ) among common anions in an acidic medium [4]
X-ray microanalysis of Co-Fe alloy electrodeposited films prepared from three different solutions (A, B, and C) revealed that the element compositions of Co and Fe in the alloys were at Co36Fe64, Co58Fe42 and Co75Fe25, respectively, depending on the Co concentration in the electrolyte bath
Summary
Phosphate is an important element that is used widely for various industrial applications such as metal plating and food processing. Considerable efforts have been made to develop highperformance ion sensors for monitoring hydrogenphosphate-ion concentration, such as ion-selective electrodes [1,2,3,4,5,6,7], bio-related systems [8], hydroxyapatite-based electrodes [9], electrochromic devices [10,11], and amperometric devices [12,13] Among these phosphate-ion sensors, ISE (ion-selective electrode)-based sensors using polymer membranes, with calixarene or molybdenumacetylacetonate [14,15] are effective but still have problems in selectivity and/or stability. A sensing mechanism of the Co-based potentiometric hydrogen-phosphate ion sensor was proposed on the basis of characterization of the materials
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