Cobalt oxide electrical conductivity

Good results are obtained with oxide-coated valve metals as anode materials. These electrically conducting ceramic coatings of p-conducting spinel-ferrite (e.g., cobalt, nickel and lithium ferrites) have very low consumption rates. Lithium ferrite has proved particularly effective because it possesses excellent adhesion on titanium and niobium [26]. In addition, doping the perovskite structure with monovalent lithium ions provides good electrical conductivity for anodic reactions. Anodes produced in this way are distributed under the trade name Lida [27]. The consumption rate in seawater is given as 10 g A ar and in fresh water is... 

In the most important series of polymers of this type, the metallotetraphenylporphyrins, a metalloporphyrin ring bears four substituted phenylene groups X, as is shown in 7.19. The metals M in the structure are typically iron, cobalt, or nickel cations, and the substituents on the phenylene groups include -NH2, -NR2, and -OH. These polymers are generally insoluble. Some have been prepared by electro-oxidative polymerizations in the form of electroactive films on electrode surfaces.79 The cobalt-metallated polymer is of particular interest since it is an electrocatalyst for the reduction of dioxygen. Films of poly(trisbipyridine)-metal complexes also have interesting electrochemical properties, in particular electrochromism and electrical conductivity.78 The closely related polymer, poly(2-vinylpyridine), also forms metal complexes, for example with copper(II) chloride.80... 

Chemical vapor deposition (CVD) was applied to produce homogeneous thin films of pure and doped spinel cobalt oxide with similar morphology on the surface of planar and monolithic supports. The planar substrates were used to investigate the thermal stability and the redox properties of the spinel using temperature-programmed methods monitored by emission-FTIR spectroscopy, while the monolithic substrates were used to test the catalytic performance of the deposited films toward the deep oxidation of methane and to evaluate its durability. The high performance of cobalt oxide to oxidize methane in diluted streams was demonstrated at 500 °C. Furthermore, controlled doping of cobalt oxide layers with suitable cations was demonstrated for nickel as an example, which resulted in substantial increase of electric conductivity. 

Platinates, bis(oxalato)-, 139 cadmium complexes superstructure, 142 cobalt complexes, 140 electrical conductivity, 14] superstructure, 141 thermopower, 141 divalent cation salts, 140 iron complexes structure, 142 lead complexes superstructure, 142 magnesium complexes, 140 electrical conduction, 142 structure, 142 thermopower, 142 modulated superstructure, 139 monovalent cation salts, 139 nickel complexes structure, 141 partially oxidized, 139 Platinates, tetracyano-, 136 anion-deficient salts, 136 electrical conduction, 138 optical properties, 138 cation-deficient salts, 138 oxidation states, 136 partially oxidized, 138 semiconductors, 134 Platinum colloidal... 

Suitable halogeno precursors for the cobalt and chromium compounds [PcCoCN] [124] and [PcCrCN] [117] are not known. The reported synthesis of PcCoCl [2b] actually produces impure PCC0CI2 [81] the oxidation product of PcCo with excess of iodine is reported to lead to a species, formulated as [Pc -C o I ] [43,125]. However, in the case of 2,3-TNP as macrocycle chlorination leads to the monomeric pentacoordinated species 2,3-TNPCoCl [14]. This compound exhibits an electrical conductivity of nearly 10 S/cm which, as in the case of the dib-complexes of 2,3-TNPFe, is caused by an additional oxidative doping of the macrocycle with oxygen. 

A cobalt 5,10,15-tetrakis(l-methylpyridinio-4-yl)porphyrin/poly(sodium p-styrene sulfonate)/reduced graphene oxide composite (CoTPyP/PSS-RGO), was fabricated using an in situ solvothermal synthesis method [92]. It showed excellent catalytic activity for ORR, attributed by the authors to its large electrochemically accessible surface area, to the excellent electrical conductivity of PS S-RGO, and to the synergistic effect between CoTPyP and PSS-RGO. 

Ullmaim, H., Paulsen, J., Trofimenko, N., and Teske, K. (1997) Oxygen nonstoichiometry and electrical conductivity of the binary strontium cobalt oxide SrCoO, . Solid State Ionics, 99, 23. 

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