Oxidation of ammonia in dilute aqueous solutions over graphite-supported α- and β-lead dioxide electrodes (PbO2@G)

被引：81
作者：
Shih, Yu-Jen [1 ,3 ]
Huang, Yao-Hui [1 ]
Huang, C. P. [2 ]
机构：
[1] Natl Cheng Kung Univ, Dept Chem Engn, Tainan 701, Taiwan
[2] Univ Delaware, Dept Civil & Environm Engn, Newark, DE 19716 USA
[3] Natl Sun Yat Sen Univ, Inst Environm Engn, Kaohsiung 804, Taiwan
来源：
ELECTROCHIMICA ACTA | 2017年 / 257卷
关键词：
Graphite; Lead oxide; Pseudocapacitance; Ammonia oxidation; Nitrogen selectivity; Constant potential; ELECTROCHEMICAL OXIDATION; DOUBLE-LAYER; ELECTROOXIDATION; DEGRADATION; VOLTAMMETRY; BETA-PBO2; NITROGEN; WATER; ELECTROCATALYSIS; CHLORINATION;
D O I：
10.1016/j.electacta.2017.10.060
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Graphite-supported a-and beta-PbO2 electrodes (PbO2@G) were prepared by electrochemical deposition at appropriate potentials with regard to Pb(II)/PbO2 redox couple under alkaline and acidic conditions, respectively, for studying the direct electro-oxidation of ammonia in aqueous solutions. Results of surface characterization including scanning electron microscopy (SEM), X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS) indicated the presence of polymorphs of PbO2@G. Cyclic voltammetry (CV) of the electrolyte containing NH3 indicated mediation of electron transfer by PbO2. At the onset potential of ca. +1.0 to +1.45 V (vs. Hg/HgO), a pathway of NH3 oxidation to nitrogen byproducts, namely, N-2, NO2- , and NO3- was proposed. The removal efficiency and selective conversion of ammonia (0.1 M Na2SO4, pH 11, 25 degrees C) on PbO2@G was determined based on controlled potential experiments. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：444 / 454
页数：11
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