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

Yu Jen Shih, Yao Hui Huang, C. P. Huang

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Graphite-supported α- and β-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, N2, NO2, and NO3 was proposed. The removal efficiency and selective conversion of ammonia (0.1 M Na2SO4, pH 11, 25 °C) on PbO2@G was determined based on controlled potential experiments.

Original languageEnglish
Pages (from-to)444-454
Number of pages11
JournalElectrochimica Acta
Volume257
DOIs
Publication statusPublished - 2017 Dec 10

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Ammonia
Lead
Oxidation
Electrodes
Electrooxidation
Diffractometers
Polymorphism
Electrolytes
Cyclic voltammetry
Byproducts
Nitrogen
X ray photoelectron spectroscopy
X rays
Scanning electron microscopy
Electrons
Experiments
lead oxide
Oxidation-Reduction

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

Cite this

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title = "Oxidation of ammonia in dilute aqueous solutions over graphite-supported α- and β-lead dioxide electrodes (PbO2@G)",
abstract = "Graphite-supported α- and β-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, N2, NO2−, and NO3− was proposed. The removal efficiency and selective conversion of ammonia (0.1 M Na2SO4, pH 11, 25 °C) on PbO2@G was determined based on controlled potential experiments.",
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Oxidation of ammonia in dilute aqueous solutions over graphite-supported α- and β-lead dioxide electrodes (PbO2@G). / Shih, Yu Jen; Huang, Yao Hui; Huang, C. P.

In: Electrochimica Acta, Vol. 257, 10.12.2017, p. 444-454.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Oxidation of ammonia in dilute aqueous solutions over graphite-supported α- and β-lead dioxide electrodes (PbO2@G)

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AU - Huang, Yao Hui

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N2 - Graphite-supported α- and β-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, N2, NO2−, and NO3− was proposed. The removal efficiency and selective conversion of ammonia (0.1 M Na2SO4, pH 11, 25 °C) on PbO2@G was determined based on controlled potential experiments.

AB - Graphite-supported α- and β-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, N2, NO2−, and NO3− was proposed. The removal efficiency and selective conversion of ammonia (0.1 M Na2SO4, pH 11, 25 °C) on PbO2@G was determined based on controlled potential experiments.

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