In:
Sustainable Energy & Fuels, Royal Society of Chemistry (RSC), Vol. 8, No. 5 ( 2024), p. 914-926
Kurzfassung:
The ammonia (NH 3 ) synthesis from nitrogen (N 2 ) and steam (H 2 O) using electrochemical cells with a hydrogen-permeable membrane, Ru/Cs + /C catalysts, and CsH 2 PO 4 /SiP 2 O 7 electrolytes at 250 °C was investigated. The highest formation rate was achieved in the hydrogen-permeable membrane cell with 30 wt%-Ru/Cs + /VXC72R catalysts, where VXC72R represents a carbon black powder of Cabot Vulcan XC-72R, reaching 32 nmol s −1 cm −2 at 60 mA cm −2 , 1.0 MPa, and 250 °C, corresponding to 15% current efficiency for NH 3 formation. This rate can be converted to 1.8 mmol h −1 g cat −1 as a catalyst-based unit. At 10 mA cm −2 , 1.0 MPa, and 250 °C, a rate of NH 3 formation of 9.8 nmol s −1 cm −2 was obtained with a corresponding current efficiency of 28%. The rate of NH 3 formation under this condition was close to the maximum current efficiency of 36% determined by the theoretical chemical equilibrium on thermodynamics. Three-electrode measurements with a reference electrode were conducted on the present cell. It was observed that the anode exhibited significant overpotential, especially at higher current density.
Materialart:
Online-Ressource
ISSN:
2398-4902
Sprache:
Englisch
Verlag:
Royal Society of Chemistry (RSC)
Publikationsdatum:
2024
ZDB Id:
2882651-6
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