Addition Of CoO Research Articles

ChemInform Abstract: Development of a Pasted Nickel Electrode with High Active Material Utilization.

AbstractIt is demonstrated that high performance and low‐cost pasted nickel electrodes with an active material utilization close to 100% and an energy density of 170 mAh/g can be prepared from a metal fiber substrate pasted with Ni(OH)2 by addition of CoO.

Synthesis of hydrocarbons from Co and H2 on Co carbonyl catalysts applied on aluminosilicate

1. Preliminary heat treatment of an applied Co carbonyl catalyst with synthesis gas at 150°C and addition of CoO result in an increase in activity. 2. Preliminary heat treatment of the Co carbonyl catalyst in a medium of different gases (CO, H2, CO + H2, Ar) results in a change in the selectivity of synthesis of hydrocarbons from CO and H2. 3. IR spectroscopy showed that CO groups which absorb in the high-frequency region of the spectrum are desorbed first with the formation of unstable complexes in carbonyl complexes applied on aluminosilicate during heat treatment. Partial regeneration of the complexes is possible in a CO + H2 atmosphere.

Piezoelectric Properties of Pb(Mg1/3Nb2/3)O3 PbTiO3 ‐PbZrO3 Ceramics Modified with Certain Additives

Effects of additives on the piezoelectric properties of Pb(Mg1/3Nb2/3)O3‐PbTiO3‐PbZrO3 ceramics in a perovskite‐type structure are described. The tetragonality of Pb(Mg1/3Nb2/3)0.375‐Ti0.375Zr0.25O3 ceramics increased with the addition of NiO, Cr2O3, or Fe2O3 but decreased with the addition of MnO2 or CoO. The dielectric and piezoelectric properties of the base composition were improved markedly through selection of additives in proper amounts. Addition of NiO yielded a high dielectric constant and planar coupling coefficient for compositions at the morphotropic transition boundary. High mechanical Q‐factors and low electrical dissipation factors were obtained by addition of MnO2. Addition of both NiO and MnO2 produced a mechanical Q‐factor of 2051 and a planar coupling coefficient of 0.553. The resonant frequency of Pb(Mg1/2Nb2/3)0.4375Ti0.4375 zr0.125O3 containing MnO2 had very low temperature and time dependence. The microstructure indicated that ceramics with a high mechanical Q‐factor had a fine, uniform grain structure. Addition of Cr2O3 retarded grain growth and addition of MnO2, NiO, CoO, or Fe2O3 promoted grain growth in the ternary system.