화학공학소재연구정보센터
Applied Surface Science, Vol.258, No.7, 3309-3314, 2012
Silver modified platinum surface/H+ conducting Nafion membrane for cathodic reduction of nitrate ions
Electrocatalytic reduction of NO3- was performed at an Ag modified Pt electrodes supported on a H+ conducting Nafion-117 polymer electrolyte. The cyclic voltammetric and electrolysis experiments showed that the reduction process was a two-electron transfer reaction. The conversion of nitrate to nitrite follows first order kinetics. Controlled potential electrolysis experiments revealed that the highest reduction rate (k(1); 95.1 x 10(-3) min(-1)) could be obtained at -1.3 V versus Ag/AgCl (std. KCl) reference electrode. Meanwhile, substantial nitrate removal (ca. 89%) could be attained by a flow system when the flow rate is as low as 0.1 ml min(-1). The Ag particles on the Pt film were a in polycrystalline state having roughness value of 0.45 mu m, which was reduced to 0.30 mu m after 270 min of undergoing electrolysis. (C) 2011 Elsevier B. V. All rights reserved.