Low overpotential reduction of dinitrogen to ammonia in aqueous media

Köleli, Fatih; Kayan, Didem Balun

doi:10.1016/j.jelechem.2009.10.010

Cited by 71 publications

(49 citation statements)

References 18 publications

(25 reference statements)

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“…Moreover, as mercury has a very large overpotential requirement for the hydrogen evolution reaction, competitive formation of H 2 during reduction was minimised. This work shows some parallels with Köleli's earlier reports of N 2 reduction on polyaniline cathodes 33,34 in suggesting that ammonia electrosynthesis is possible in metal-free systems.…”

Section: Ammonia Electrosynthesis Using Water As the Proton Source Atsupporting

confidence: 86%

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Recent progress towards the electrosynthesis of ammonia from sustainable resources

2017

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Ammonia (NH 3 ) is a key commodity chemical of vital importance for fertilizers. It is made on an industrial scale via the Haber Bosch process, which requires significant infrastructure to be in place such that ammonia is generally made in large, centralized facilities. If ammonia could be produced under less demanding conditions, then there would be the potential for smaller devices to be used to generate ammonia in a decentralized manner for local consumption. Electrochemistry has been proposed as an enabling technology for this purpose as it is relatively simple to scale electrolytic devices to meet almost any level of demand. Moreover, it is possible to envisage electrosynthetic cells where water could be oxidized to produce protons and electrons at the anode which could then be used to reduce and protonate nitrogen to give ammonia at the cathode. If this nitrogen were sourced from the air, then the only required infrastructure for this process would be supplies of water, air and electricity, the latter of which could be provided by renewables. Hence an electrosynthetic cell for ammonia production could allow NH 3 to be generated sustainably in small, low-cost devices requiring only minimal facilities. In this review, we describe recent progress towards such electrosynthetic ammonia production devices, summarizing also some of the seminal literature in the field. Comparison is made between the various different approaches that have been taken, and the key remaining challenges in the electrosynthesis of ammonia are highlighted.

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Section: Ammonia Electrosynthesis Using Water As the Proton Source Atsupporting

confidence: 86%

“…33 Hence polyaniline films were first deposited onto platinum supports from solutions of aniline in 0. quoted. 34 These results were intriguing in suggesting that metals catalysts are not essential for N 2 electroreduction to ammonia, of which we shall see another example in Section 4.2.…”

Section: Electrochemical Ammonia Production Using Sacrificial Proton mentioning

confidence: 99%

Recent progress towards the electrosynthesis of ammonia from sustainable resources

2017

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“…The optimum film thickness was determined as 5 cycles (ca. 0.73 µ m) experimentally, with respect to the highest ammonia concentration of 53 µ M. 5 This experimental result was also confirmed during the EIS investigations and the 5-cycle film had the smallest pore resistance (Figure 7). Cycle number CPE 1 mF (n 1 ) EIS data of the PPy electrode at various film thicknesses calculated by using the fitting method are presented in Table 2.…”

Section: The Effect Of Film Thickness On Impedance Measurementssupporting

confidence: 70%

“…The results of preparative electrolyses in our previous study confirm the impedance spectroscopic findings presented in the present study. 5 The sum of two resistances, R 1 (resistance of the film) and R 2 (related to reduction kinetics), give an idea about the overall reaction, and the potential dependence of -log (R 1 + R 2 ) provides an EIS-Tafel diagram (Figure 9), which can be used for kinetic data derived from the Tafel equation:…”

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confidence: 99%

Dinitrogen reduction on a polypyrrole coated Pt electrode under high-pressure conditions: electrochemical impedance spectroscopy studies

Kayan

Köleli²

2015

Turk J Chem

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Abstract:The electrochemical impedance spectroscopy (EIS) responses of a polypyrrole (PPy)-coated platinum electrode were investigated during N 2 -reduction to ammonia in aqueous medium. Kinetic parameters such as film resistance, pore resistance, and double layer capacitance were analyzed as a function of applied potential and polymer film thickness.The relation between kinetic parameters was discussed by combining electrolysis results. It was found that the optimum film thickness of polypyrrole was 0.73 µ m and optimum potential for ammonia synthesis was -0.150 V under 60 bar α -transfer coefficient of 0.49 and an exchange current density with a value of 3.17 10 −3 A cm −2 were characteristic for H ad formation in acidic aqueous medium.

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“…The electrochemical reductions of N 2 and CO 2 were investigated separately in aqueous medium in our previous studies [27][28][29], and we could reduce these substances with the application of the lowest possible overpotential values (−0,4 V NHE) -from the literature -to valuable substances. Now, we present the results of a simultaneous, one step reduction of both N 2 and CO 2 gases, in the same ambiance to the obtain urea with the lowest possible energy input (overpotential) on polyaniline and polypyrrole coated platinum electro-catalysts, for the first time.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous electrocatalytic reduction of dinitrogen and carbon dioxide on conducting polymer electrodes

Kayan

Köleli

2016

Applied Catalysis B: Environmental

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Low overpotential reduction of dinitrogen to ammonia in aqueous media

Cited by 71 publications

References 18 publications

Recent progress towards the electrosynthesis of ammonia from sustainable resources

Recent progress towards the electrosynthesis of ammonia from sustainable resources

Dinitrogen reduction on a polypyrrole coated Pt electrode under high-pressure conditions: electrochemical impedance spectroscopy studies

Simultaneous electrocatalytic reduction of dinitrogen and carbon dioxide on conducting polymer electrodes

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