ChemInform Abstract: ELEKTROOXIDATION VON HARNSTOFF AN EINER GLATTEN PLATINELEKTRODE 2. MITT.

Gromyko, V. A.; Tsygankova, T. B.; Gaidadymov, V. B.; Vasil'ev, Yu. B.; Bagotskii, V. S.

doi:10.1002/chin.197414142

Cited by 4 publications

(6 citation statements)

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“…At the conditions under which water decomposition does not occur and at sufficiently high potentials urea is oxidized to CO 2 and N 2 . Analysis of the polarization curves obtained in solutions of urea containing sodium chloride shows that at high potentials urea is oxidized directly on Pt without the participation of Cl -ions [34,35,38]. In contrast, it was shown that during the electrolysis of a solution of urea of concentration corresponding to that of spent dialysate urea is oxidized by anodically formed chlorine.…”

Section: Introductionmentioning

confidence: 93%

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Electrochemical treatment of aqueous solutions containing urea

et al. 2009

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Investigations on the anodic decomposition of urea using Ti/Pt and Ti/(RuO 2 -TiO 2 ) 40:60 electrodes were carried out. The kinetics of the process were examined in a periodic electrolyser. The effect of anodic current density, initial urea concentration, and sodium chloride concentration on the effectiveness of the basic process (average rate of urea decomposition, current efficiency, and unit power consumption) is discussed. When a Ti/Pt electrode is applied for urea removal from aqueous solution urea is not decomposed directly at the surface of the electrode, but rather in the bulk of the solution by hypochlorite formed during the process. When the Ti/(RuO 2 -TiO 2 ) 40:60 electrode is used for the removal of urea from aqueous solutions, the reaction of urea with chlorine adsorbed at the electrode predominates. In both cases non-toxic products of urea decomposition (N 2 , CO 2 ,) are formed. Comparison of the effectiveness of anodic decomposition of urea for the Ti/Pt and Ti/(RuO 2 -TiO 2 ) 40:60 electrodes in the periodic electrolyser at optimum process parameters has revealed that the former electrode is more favorable.

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Section: Introductionmentioning

confidence: 93%

“…During the electrolysis of the solutions containing urea and chloride ions the following reactions may occur [34][35][36]:…”

Section: Introductionmentioning

confidence: 99%

Electrochemical treatment of aqueous solutions containing urea

et al. 2009

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“…The theoretical open circuit voltage (OCV) of DUFC using humidified oxygen or air as the oxidant achieves only 1.147 V [22] . However, as an oxidant in fuel cells, hydrogen peroxide (H 2 O 2 ) possesses faster reaction kinetics than oxygen to be applied into direct urea‐hydrogen peroxide fuel cell (DUPFC) [24a,25, 95] . In certain DUPFC system, the anodic electrooxidation of urea occurs in a basic electrolyte, while the cathodic electroreduction of H 2 O 2 could run both in basic and acidic electrolyte.…”

Section: Energy‐related Uor Applications and Devicesmentioning

confidence: 99%

Electrochemical Urea Oxidation in Different Environment: From Mechanism to Devices

Wang

Duan

et al. 2022

ChemCatChem

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Urea has been regarded as an important chemical compound in the food‐water‐energy nexus. However, the emission of urea from human activity, industrial manufacture, and agricultural fertilization into the environment has caused an ecological nitrogen imbalance. Besides addressing the environmental pollution, the applications of clean energy conversion from urea‐rich wastewater has strong potential for resource and energy recovery. Herein, we conducted a comprehensive overview of electrochemical urea oxidation reaction (UOR) for pollution control and energy harvesting. The present mechanisms and behaviors of UOR under different water matrices have been characterized and compared in detail. Additionally, the latest development of electrochemical UOR integrated into electrolyzers and fuel cells are presented. Finally, we discuss the prospects and challenges of UOR technologies, suggesting several directions for the electrochemical conversion of urea‐abundant wastewater in the near future.

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“…Numerous precious metal-containing electrocatalysts have been applied for UOR [4,[14][15][16]. In recent years, cost-effective electrocatalysts, including nickel-containing electrodes, have been recommended as an active and durable catalyst for the electrooxidation of smaller organic materials [17,18] and for UOR under alkaline conditions [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Electrooxidation of Urea in Alkaline Solution Using Nickel Hydroxide Activated Carbon Paper Electrodeposited from DMSO Solution

et al. 2021

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Electrooxidation of urea plays a substantial role in the elimination of urea-containing wastewater and industrial urea. Here, we report the electrodeposition of nickel hydroxide catalyst on commercial carbon paper (CP) electrodes from dimethyl sulphoxide solvent (Ni(OH)2-DMSO/CP) for urea electrooxidation under alkaline conditions. The physicochemical features of Ni(OH)2-DMSO/CP catalysts using scanning electron microscopy and X-ray photoelectron spectroscopy revealed that the Ni(OH)2-DMSO/CP catalyst shows nanoparticle features, with loading of <1 wt%. The cyclic voltammetry and electrochemical impedance spectroscopy revealed that the Ni(OH)2-DMSO/CP electrode has a urea oxidation onset potential of 0.33 V vs. Ag/AgCl and superior electrocatalytic performance, which is a more than 2-fold higher activity in comparison with the counterpart Ni(OH)2 catalyst prepared from the aqueous electrolyte. As expected, the enhancement in electrocatalytic activity towards urea was associated with the superficial enrichment in the electrochemically active surface area of the Ni(OH)2-DMSO/CP electrodes. The results might be a promising way to activate commercial carbon paper with efficient transition metal electrocatalysts, for urea electrooxidation uses in sustainable energy systems, and for relieving water contamination.

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ChemInform Abstract: ELEKTROOXIDATION VON HARNSTOFF AN EINER GLATTEN PLATINELEKTRODE 2. MITT.

Cited by 4 publications

References 0 publications

Electrochemical treatment of aqueous solutions containing urea

Electrochemical treatment of aqueous solutions containing urea

Electrochemical Urea Oxidation in Different Environment: From Mechanism to Devices

Electrooxidation of Urea in Alkaline Solution Using Nickel Hydroxide Activated Carbon Paper Electrodeposited from DMSO Solution

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