Electrochemical Behavior of Graphite and Ni‐Cr Electrodes in Sodium Polysulfide in the Absence and Presence of Hydrogen Sulfide

Abstract

1.4 • 1015 to 5.38 • 10 ~1 s cm at 200~ with increase in Na § concentration.Figure 4 shows the variation in conductivity as a function of reciprocal temperature. Two distinct regions were observed. The activation energy was calculated from these plots. The activation energy decreases with increase in Na § concentration from 0.37 to 0.2 eV at low temperature and 1.32 to 0.91 eV at higher temperature regions.Dielectric parameters (e and tan 8) were measured from 102-106 Hz at 25 ~ 100 ~ and 200~ A decrease in dielectric constant was observed with increase in frequency (Fig. 5 and 6). Dependence of dielectric loss on temperature and frequency is shown in Fig. 7 and 8. By the addition of Na § loss value increased from 0.16 to 0.8. Conclusions1. Cyclodehydration of poly(amide-acid) is influenced by the presence of Na + ions. An increase in Na + ion concentration resulted in a decrease in cyclodehydration reaction.2. The conductivity measurement showed sodium ion participation in conduction.3. A decrease in resistivity and activation energy is observed with increase of sodium ion concentration.

Carbon-Negative production of Hydrogen through Sulfur Intermediates

“…[37][38][39][40] This has motivated the development of numerous methods to decompose H 2 S to liberate the H 2 , including direct thermal decomposition, electrolysis, indirect decomposition with iodine, and others. [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] However, to date, none of these alternative methods have achieved large-scale industrial implementation due to significant technical challenges. [40] The cycle we propose here avoids many of these pitfalls by using H 2 S as a chemical reducing agent to regenerate a SO 2 electrochemical cell.…”

Electrocatalytic activity of a graphite electrode coated with hexadecachlorophthalocyanatoiron(II) toward sulfide oxidation, and its possible application in electroanalysis

“…Thus the current maximum at -0.33 V (20 mV s-I) is probably slightly underestimated. C. A suggested mechanism for electrocatalytic oxidation of sulfide ion on a F~"[c~,,Pc(~-)]/ C electrode The electrochemical oxidation of sulfide ion to elemental sulfur has been studied very extensively in the literature (6,(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22); here we will only deal with the involvement of the surface coating of F~" [ C~,~P C (~-) ]…”