The Anodic Oxidation of Ammonia at Platinum Black Electrodes in Aqueous Koh Electrolyte

Oswin, H. G.; Salomon, Mark

doi:10.1139/v63-243

Cited by 178 publications

(128 citation statements)

References 8 publications

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“…The presence of these waves can again be attributed to the initial dissociation of ammonium to form ammonia and protons; the protons are then reduced at the electrode surface to form hydrogen, which can be oxidized at the electrode surface along with the ammonia at higher potentials. These observations are consistent with that observed in [EMIM][N(Tf) 2 ].…”

Section: Elucidation Of the Oxidative Processsupporting

confidence: 93%

Elucidation of the Electrochemical Oxidation Pathway of Ammonia in Dimethylformamide and the Room Temperature Ionic Liquid, 1‐Ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide

et al. 2004

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The direct electrochemical oxidation of ammonia has been examined in both the organic solvent dimethylformamide (DMF) and the room temperature ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [EMIM][N(Tf) 2 ]. The corresponding voltammetric responses have been shown to be similar in each solvent with a broad oxidative wave occurring upon the introduction of ammonia to the solution and the appearance of a new reductive wave following the oxidation. The oxidative reaction process has been examined and a suitable reaction pathway has been deduced, corresponding to the formation of ammonium cations after oxidation of the ammonia. A linear response of limiting current against vol% ammonia was observed in both DMF and [EMIM][N(Tf) 2 ], suggesting potential application for analytical methods.

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Section: Elucidation Of the Oxidative Processsupporting

confidence: 93%

Elucidation of the Electrochemical Oxidation Pathway of Ammonia in Dimethylformamide and the Room Temperature Ionic Liquid, 1‐Ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide

et al. 2004

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“…The pH behavior can be explained as follows. In basic solutions above pH 8, when the ammonia decomposition reaction of Equation (5) occurs at the anode, the adsorption of molecular ammonia at the electrode as in Equation (6) takes place before its oxidation [5,8,[13][14][15][16], and also the adsorption of the hydroxyl ions (OH ) ) for the water splitting reaction as in Equation (3) competes with the ammonia [5,8,17]. When the initial concentration of ammonia in the solution is sufficiently high, the anode is considerably covered by the ammonia, so a dominant ammonia oxidation occurs at the anode.…”

Section: Ph Behavior Of Ammonia Solution In the Electrolytic Cellmentioning

confidence: 99%

Electrolytic decomposition of ammonia to nitrogen in a multi-cell-stacked electrolyzer with a self-pH-adjustment function

2006

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This paper describes a study of continuous decomposition characteristics of ammonia to nitrogen in a multi-cellstacked electrolyzer with an anion exchange membrane. The pH change of ammonia solution in both the anodic and cathodic chambers of a divided cell due to the water splitting reactions was studied together with the electrolytic decomposition of ammonia. The electrolytic decomposition efficiency of ammonia was considerably affected by the pH change of ammonia solution caused by the water splitting reactions. In the anodic chamber with the ammonia solution, the water splitting reaction which produced protons occurred at a pH of less than 8, and in the cathodic chamber, that producing hydroxyl ions occurred at a pH of more than 11. By using the characteristics of the electrolytic water splitting reactions in a divided cell, a continuous electrolyzer with a self-pH-adjustment function was devised, wherein a portion of the ammonia solution from a pH-adjustment reservoir was circulated through the cathodic chambers of the electrolyzer. This enhanced the pH of the ammonia solution being fed from a pH-adjustment reservoir into the anodic chambers of the electrolyzer, which caused a higher ammonia decomposition yield. Based on this electrolyzer, a saltfree ammonia decomposition process was suggested. In this process, ammonia in the solution was continuously and effectively decomposed into environmentally harmless nitrogen gas.

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“…For the hydrogen evolution reaction, it follows Ta fel (rds) and/or Heyrovsky (rds)-Volmer sequencer esultingi naTafel slope of 50 mV dec À1 (Figure S4). [22][23][24][25] Finally,c hronopotentiograms (CPs) of the anode at various constant currents ranging from 0.2 to 0.6 Aw ere conducted, and their product and efficiency were evaluated as shown in Figure7a. All of the CPs shows al inearly increasing curves from 0.6 to 0.75 Va nd then as harp jump to above 1.6 Va s time passes.T he sharp rise in voltage occurs after as horter time when the current is higher.T hese phenomenac ould be explained by competition between Equation (1) and (2), the oxidation of NH 3 and the oxidationofO H À .…”

Section: à2mentioning

confidence: 99%

Alkaline Ammonia Electrolysis on Electrodeposited Platinum for Controllable Hydrogen Production

2015

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Ammonia is beginning to attract a great deal of attention as an alternative energy source carrier, because clean hydrogen can be produced through electrolytic processes without the emission of COx . In this study, we deposited various shapes of Pt catalysts under potentiostatic mode; the electrocatalytic oxidation behavior of ammonia using these catalysts was studied in alkaline media. The electrodeposited Pt was characterized by both qualitative and quantitative analysis. To discover the optimal structure and the effect of ammonia concentration, the bulk pH value, reaction temperature, and applied current of ammonia oxidation were investigated using potential sweep and galvanostatic methods. Finally, ammonia electrolysis was conducted using a zero-gap cell, producing highly pure hydrogen with an energy efficiency over 80 %.

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The Anodic Oxidation of Ammonia at Platinum Black Electrodes in Aqueous Koh Electrolyte

Cited by 178 publications

References 8 publications

Elucidation of the Electrochemical Oxidation Pathway of Ammonia in Dimethylformamide and the Room Temperature Ionic Liquid, 1‐Ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide

Elucidation of the Electrochemical Oxidation Pathway of Ammonia in Dimethylformamide and the Room Temperature Ionic Liquid, 1‐Ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide

Electrolytic decomposition of ammonia to nitrogen in a multi-cell-stacked electrolyzer with a self-pH-adjustment function

Alkaline Ammonia Electrolysis on Electrodeposited Platinum for Controllable Hydrogen Production

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