A new rechargeable cell Na/Na+ ion normalconductor/SCl3+ in molten AlCl3‐normalNaCl is described. This cell operates at temperatures in the range of 180°–250°C and has an open‐circuit voltage of 4.2V. The discharge process involves the reduction of tetravalent sulfur to the elemental state; sulfur can be further reduced to sulfide. The preferred sodium ion conductor is β″‐alumina. High energy density values, large percent utilization of the active material, and good energy efficiency have been demonstrated. The performance of cells prepared in the discharged and charged states were found to be the same. The number of deep charge/discharge cycles has exceeded 400.

The electrooxidation of sulfur in AlCl3‐normalNaCl false(63–37 normalmole percentfalse) has been investigated in the temperature range 150°–250°C. The oxidation of sulfur proceeds from S8 to SCl3+ and involves intermediates S8+ false(S162+false) , S82+ , and S(I).

The electrochemical reactions of selenium species in a basic AICI3-NaCI melt has been studied by measuring EMF of an Na/SeCl~ cell. The reaction mechanism between elemental and tetravalent selenium consists of at least four electrochemical steps, including intermediates such as Se 2 § Se~ +, and Se~*. The reaction sequence from Se 4 § to Se~ § is discussed. The formal potential for each reaction is also determined. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 141.211.4.224 Downloaded on 2015-06-29 to IP

The oxidation of sulfur in chloroaluminate melts in the composition range 53-47 to 49.9-50.1 mol percent A1C13-NaC1 (pC1 of 5.4-1.5 at 175~ was investigated by visible spectrophotometry, and ring-disk, differential pulse, and cyclic voltammetry. The oxidation process undergoes a significant change in this narrow melt composition region. Low oxidation states of sulfur, such as Ss § and Ss ~+, were found to be stable only atpC1 >-3.8. The other main oxidation products are $2C12, stable over the entire pC1 range studied, and SC13 +, stable only in acidic melts. ABSTRACTThe electrochemical oxidation of hydrazine has been examined on tetrasulfonated phthalocyanines of Fe, Co, Ni, and Cu, adsorbed on ordinary pyrolytic graphite electrodes and substantial catalytic effects have been observed on the Co and Fe derivatives. Tafel plots give slopes of 40 and 60 mV/decade for Fe-TSP and Co-TSP, respectively. The chemical orders in OH-and N2H4 have been determined and possible mechanisms for the reaction are proposed.

Es wird eine neue wiederaufladbare Zelle des Typs A in AlCl3‐NaCl‐Schmelze beschrieben, die im Temp.‐Bereich 180‐250°C arbeitet und eine Klemmenspannung von 4.2 Vbesitzt.