Liquid Ammonia as a Nonaqueous Solvent: The Kinetics of the Pb/Pb2+ Exchange

Larkin, David J.; Hackerman, N.; Buck, A. E.; Thompson, L. K.

doi:10.1149/1.2404159

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…At --60~ approximately 5M solu-tions of NH4NO3 were used. A dry ice-chloroform bath was used for measurements at --60~ to provide temperature control of _+I~ Recent work has verified that the lead-saturated lead nitrate (SLN) reference electrode used works well in liquid ammonia solutions (9). All potential-current measurements were made using a Beckman Electroscan 30 instrument.…”

Section: Methodsmentioning

confidence: 99%

“…NH= ads -F NHy ads --> NaHz ads [9] N2Hz ads "-> N2 -I-zH + -F ze- [10] where x and y are integers ranging from 0 to 3 with x ~ y and 0 ~ z ~ 4. Simple kinetic considerations predict an anodic transfer coefficient value of ~ ----2 when processes involving chemical recombination of adsorbed species are rate determining.…”

Section: Nhxads -> Nhy Ads -}-(X --Y)h + + (X --Y)e-[8]mentioning

confidence: 99%

“…Simple kinetic considerations predict an anodic transfer coefficient value of ~ ----2 when processes involving chemical recombination of adsorbed species are rate determining. If interfering anodic reactions can be neglected, then the experimental values for a, which range from 0.2 to 0.7, suggest that neither reaction [9] nor the recombination of adsorbed nitrogen atoms is rate determining. Since the electrochemical oxidation of hydrazine occurs readily in liquid ammonia (7), it seems unlikely that reaction [10] would be rate determining.…”

Section: Nhxads -> Nhy Ads -}-(X --Y)h + + (X --Y)e-[8]mentioning

confidence: 99%

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Hydrogen and Nitrogen Evolution Reactions in Acid Liquid Ammonia

Miles

Yates

1974

J. Electrochem. Soc.

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The hydrogen and nitrogen evolution reactions were investigated on various electrode surfaces in acid (NH4NO~) liquid ammonia solutions at temperatures ranging from 20 ~ to --60~ Tafel slopes, transfer coefficients, and exchange currents were determined from the potential-current measurements. The relative rates of the hydrogen evolution reaction on various surfaces in liquid ammonia is in the order Pt, Ir >> Ni2B, Au > Mo, Cr, W >> Ta, similar to the relative reactivities found in aqueous solutions. The Tafel slopes for the cathodic reaction are also similar to Tafel slopes determined in aqueous solutions at comparable temperatures. However, the apparent cathodic transfer coefficients tend to decrease significantly at low temperatures. On platinum surfaces, the slow step appears to change from the chemical reccmbination of adsorbed hydrogen atoms to an electrochemical process as the temperature decreases. Studies of the nitrogen evolution reaction are complicated by possible interfering anodic reactions. However, the results indicate that there is an extremely high overvoltage associated with the nitrogen evolution reaction, and that electrochemical process rather than chemical recombination steps control the reaction rate. * Electrochemical Society Active Member.

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Section: Methodsmentioning

confidence: 99%

Section: Nhxads -> Nhy Ads -}-(X --Y)h + + (X --Y)e-[8]mentioning

confidence: 99%