Electrochemical Studies on Ionic Nitride Solutions in Molten Salts

Abstract

iodide can only be explained by assuming some solubility of foreign cations in the solid (K + or H + ). These ions can enter from the solution and seem to have a mobility (diffusion coefficient) in the solid comparable to that of the silver ions. Detailed data cannot be obtained from the present results; it seems worthwhile to study the solubility and diffusion coefficient of such foreign ions by more direct solid-state methods.The main difference between the behavior of the two compounds Ag3SI and Ag19115P~O7 may stem from the different degree to which replacement of Ag + by other ions is possible in the interface. In Ag2SI only a very small part of the silver is exchangeable and the compound remains insoluble. With AglgI15P207 depletion of silver leads to new, water-soluble phases. ABSTRACTThe activity of Li~N dissolved in molten LiC1 at 923~ in the range of molar fraction between 0.101-1.6 X 10 -3 has been determined by using the following galvanic cell Fe, Li (1)/LiC], Li~N/N2 (g, 1 arm), Fe (I)) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 132.239.1.231 Downloaded on 2015-08-24 to IP

Electrochemical Properties of Li3 N Dissolved in Molten LiCl at 900 K

“…The difference between experimentally observed, ⌬E decomp , and the ⌬E Li 3 N o ͑0.155 V at 900 K͒ was more than 140 mV, therefore, the a Li 3 N ͑s͒ is estimated to be lower than 4 ϫ 10 Ϫ3 . This is in reasonable accord with the work by Bonomi et al 2 and Goto et al 6 To measure ⌬E decomp with sufficient reliability, an alternative method using a Pb-Li alloy electrode was employed. Using the Pb-Li liquid alloy in equilibrium with molten salt under nitrogen atmosphere, it is possible to measure lithium metal activity in molten salt with respect to the Li/Li ϩ reference.…”

Recent Advances and Challenges of Electrocatalytic N2Reduction to Ammonia

“…The electrolytic formation of nitrides from N 2 in molten alkali chlorides was reported prior to 1980. 337,338 Moreover, in 1998, Goto et al 339 reported that N 2 molecules can be electrochemically reduced to nitride ions (1/2N 2 + 3e − → N 3− ) in the molten eutectic mixture of LiCl−KCl (operating at 450 °C) at a nickel wire electrode. Since then, Murakami et al carried out a series of electrochemical ammonia synthesis experiments in the molten eutectic mixture of LiCl−KCl− CsCl containing 0.5 mol % Li 3 N, using hydrogen gas (H 2 ), 340,341 methane (CH 4 ), 342 hydrogen sulfide (H 2 S), 343 hydrogen chloride (HCl), 344 or water (H 2 O) 345,346 as the hydrogen source.…”

The Feasibility of Electrochemical Ammonia Synthesis in Molten LiCl–KCl Eutectics

“…(12)],which themselves can be reduced [Eq. (13), (14)], presumably at the same potentials as c1 and c3, respectively. Theproduction of Hfrom NH 2À during a2/c2 explains why the current for the non-N based a3/c3 couple is of similar magnitude to the Nb ased processes.…”

“…[7][8][9][10][11][12] In particular, it has been reported that molten LiCl, and related eutectics,p ossess the fascinating ability to stabilise the N 3À ion and establish the reversible N 2 /N 3À redox couple at ambient pressure. [13][14][15][16] Ito and co-workers proposed that this could be utilised in an ammonia synthesis process,by coupling the reduction of N 2 [Eq. (1)] at ac athode with its oxidation in the presence of H 2 [Eq.…”