NH3 decomposition in a single-chamber proton conducting cell

Skodra, Aglaia; Ouzounidou, Martha; Stoukides, Michael

doi:10.1016/j.ssi.2006.03.051

Cited by 24 publications

(25 citation statements)

References 9 publications

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“…• C but improved by up to two orders of magnitude at higher temperatures as reported by Skodra et al 21 Furthermore, NH 3 synthesis using molten salt electrolyte based systems can yield high conversion ratios similar to that of polymer based membranes. Solid-state proton conductors (SSPC) denote a class of ionic solid electrolytes which have the capability to transfer hydrogen ions (H + ).…”

supporting

confidence: 56%

Electrochemical Synthesis of Ammonia in Molten Salt Electrolyte Using Hydrogen and Nitrogen at Ambient Pressure

Biçer

Dinçer

2017

J. Electrochem. Soc.

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In this study, the synthesis of ammonia (NH3) at ambient pressure using H2 and N2 is electrochemically achieved. The conducting and reaction media with molten salt consist of molten hydroxide as NaOH and KOH whereas the reaction temperature is varied in the range of 200°C to 255°C to investigate the impact of temperature on the ammonia production rate and hence performance. The porous nickel mesh electrodes having an area of 100 cm2 are used as cathode and anode where the supplied electricity is controlled using potentiostat/galvanostat. The maximum faradaic efficiency for ammonia synthesis is found to be 9.3% at 210°C corresponding to 6.53 × 10−10 mol/s cm2 ammonia evolution rate at 2 mA/cm2 current density with nano-Fe3O4 as the catalyst. Furthermore, the applied voltages and applied currents are varied to find the optimum experimental conditions for molten salt electrolyte based electrochemical ammonia synthesis.

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supporting

confidence: 56%

Electrochemical Synthesis of Ammonia in Molten Salt Electrolyte Using Hydrogen and Nitrogen at Ambient Pressure

Biçer

Dinçer

2017

J. Electrochem. Soc.

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“…Although numerous works on the catalytic decomposition of MH 3 can be found in the literature, only a few studies conducted in solid electrolyte cells have been reported [17][18][19][20]. Pitselis et al [17] studied the reaction using Fe as the working electrode and CaZr 0.9 In 0.1 O 3-a as the proton conductor, at temperatures between 530 and 600°C.…”

Section: Discussionmentioning

confidence: 99%

ΝΗ3 decomposition in a proton conducting solid electrolyte cell

et al. 2008

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The reaction of NH 3 decomposition was studied on Ag in a proton conducting double chamber cellreactor. The proton conductor was a strontia-ceria-ytterbia (SCY) perovskite of the form SrCe 0.95 Yb 0.05 O 3-a . The reaction was studied at 350-700°C and atmospheric total pressure. The proton transference number (PTN) was calculated by simultaneous measurement of the imposed current and the proton flux and it was found to vary between 0.5 and 0.7. The effects of imposed current, temperature and inlet gas composition on the reaction rate and the PTN, were examined. Although the faradaic efficiency (K) remained near unity in all experiments, reaction rate enhancements (q) as high as 57 were achieved. An up to 90% decrease in the activation energy of the reaction was observed when protons were electrochemically ''pumped'' away from the catalyst.

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“…Boudart et al [28] proposed that over W and Mo catalysts, N-H bond cleavage and recombinative desorption of surface nitrogen atoms are slow irreversible steps in NH3 decomposition, NH3 is activated via a direct dissociative adsorption step, and the adsorbed N atoms are the most abundant reactive intermediate. [32] found that at higher temperatures (350 -650 °C) and low ammonia partial pressures (0.5 -2.0 kPa) over a Ru catalyst, hydrogen inhibition was no longer significant. They also observed a second order dependence of the rate of decomposition on ammonia partial pressure.…”

Section: Reaction Mechanism Of Ammonia Decompositionmentioning

confidence: 97%

Ammonia as a Hydrogen Source for Fuel Cells: A Review

Cheddie¹

2012

Hydrogen Energy - Challenges and Perspectives

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NH3 decomposition in a single-chamber proton conducting cell

Cited by 24 publications

References 9 publications

Electrochemical Synthesis of Ammonia in Molten Salt Electrolyte Using Hydrogen and Nitrogen at Ambient Pressure

Electrochemical Synthesis of Ammonia in Molten Salt Electrolyte Using Hydrogen and Nitrogen at Ambient Pressure

ΝΗ3 decomposition in a proton conducting solid electrolyte cell

Ammonia as a Hydrogen Source for Fuel Cells: A Review

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