Silver modified platinum surface/H+ conducting Nafion membrane for cathodic reduction of nitrate ions

被引：24

作者：

Hasnat, M. A. ^{[1
,2
]}

Ahamad, N. ^{[1
]}

Uddin, S. M. Nizam ^{[1
]}

Mohamed, Norita ^{[2
]}

机构：

[1] Shahajalal Univ Sci & Technol, Grad Sch Phys Sci, Dept Chem, Sylhet 3114, Bangladesh

[2] Univ Sains Malaysia, Sch Chem Sci, Minden 11800, Penang, Malaysia

来源：

APPLIED SURFACE SCIENCE | 2012年 / 258卷 / 07期

关键词：

Nitrate reduction; Voltammetry; Electrolysis; Rate constant; Selectivity; SOLID POLYMER ELECTROLYTE; ELECTROCATALYTIC REDUCTION; ACID-SOLUTIONS; ELECTROREDUCTION; HYDROGEN; NITRITE; PD; ALLOY; CATALYSTS; AMMONIA;

D O I：

10.1016/j.apsusc.2011.11.088

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：3309 / 3314

页数：6

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