Iron and hydrogen electrodes in liquid ammonia

✍ Scribed by M. Ahrens; K.E. Heusler

• Book ID: 103066271
• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 474 KB
• Volume: 27
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(82)80009-1

✦ Synopsis

m-t--Equilibrium potentials of the iron(H)-iron electrode vs Tl-TICI; 0.1 M NH.Cl in liquid ammonia sre determined from intcrsnctions of Tafef lines for iron deposition and dissolution. The hydro9cn ekctmde is shown to behave rsvcrsib)y at pllpdium hydride, but not at platinum with respect to the depart-of hydrngcn pressure. The standard potential of iron at 293 K is estimated at E" = -4356 (*O,OlO)V in 0.1 M NH.NOJ. Standard pntuntials of other etirodes am reevaluated and shown to be consistent with earlier messuretnents except for the standard potential of lead. Steady state and transient polarization curves indicate in siajDk machanism of ths iron ekctmds involvins transfer of iron(K) in one sten. The tcmneratnrumdqendsnt a&ii transfer ooctedcmt is a + = 0.41 ( f 6.02), the cathe& iransfcr c&icicnt &_ = 0.61 ( f 0.03). The standard exchauge currant density at E' is j: = 7.10-' Acm-* for 293 K. Exchange current d~iticsofthehv&aaenelectrodearei, = 1.6~10-9Acm-2at platinixedplatinumiaO.1 MNH,Clbothfor 293K.