| 1. |
- Cornell, Ann, et al.
(författare)
-
The effect of addition of chromate on the hydrogen evolution reaction and on iron oxidation in hydroxide and chlorate solutions
- 1992
-
Ingår i: Electrochimica Acta. - 0013-4686 .- 1873-3859. ; 37:10, s. 1873-1881
-
Tidskriftsartikel (refereegranskat)abstract
- The addition of chromate to the electrolyte has been shown in previous papers to hinder almost completely the electroreduction of hypochlorite, while the hydrogen evolution reaction can still proceed on the cathode surface. The effect of chromate on the latter reaction has been studied with cyclic voltammetry and by measuring polarization curves for iron electrodes in both chlorate and hydroxide electrolyte. For the sake of comparison, the investigations have also included the effects on the gold electrode in hydroxide solution. The results showed that the kinetics is changed in a way that decreases the differences in electrocatalytic activity between different electrode materials. Also, the innermost layer of the chromium hydroxide film seems to be the most active part in the HER. The chromate also affects the oxidation of the iron surface. A practical result of this is that the activity for the HER on corroded iron in chlorate electrolyte depends on whether the electrolyte contained chromate during the period of corrosion. The activation becomes much smaller if chromate is present.
|
|
| 2. |
|
|
| 3. |
- Lazzaroni, R., et al.
(författare)
-
The chemical and electronic structure of the interface between aluminum and conjugated polymers
- 1994
-
Ingår i: Electrochimica Acta. - : Elsevier. - 0013-4686 .- 1873-3859. ; 39:2, s. 235-244
-
Tidskriftsartikel (refereegranskat)abstract
- The chemical and electronic structure of the interface between aluminum and several proto-typical conjugated systems is investigated with a combined experimental and theoretical approach. The experiments consists of following the evolution of the polymer surface during the early stages of aluminum deposition, with X-ray and Ultraviolet Photoelectron Spectroscopies (XPS, UPS). In parallel, quantum chemical calculations are performed on model oligomer systems interacting with isolated Al atoms. Aluminum is found to interact strongly with the polymer chain. New covalent Al-carbon bonds are formed along the polymer backbone; the chain geometry is deeply modified and the π electron conjugation can be dramatically reduced.
|
|
| 4. |
- Petersen, G., et al.
(författare)
-
A Raman study of ion-polymer and ion-ion interactions in low molecular weight polyether - LiCF3SO3 complexes
- 1992
-
Ingår i: Electrochimica Acta. - : Elsevier. - 0013-4686 .- 1873-3859. ; 37:9, s. 1495-1497
-
Tidskriftsartikel (refereegranskat)abstract
- We report Raman scattering investigations of the stability of various ion—polymer interactions from studies of LiCF3SO3—polyethers. New results for endcapped polyethers of different molecular weights in the range of one to eight repeat units are compared with previous data from OH-terminated polyether salt complexes. We conclude that anions coordinated to OH-endgroups are more stable than cations forming crosslinks between oxygens of adjacent polymer chains which in turn are more stable than cations coordinated to single oxygens. It is the weak oxygen—cation bond which is causing the dramatic increase in ion—ion association as tempearature increases. OH—anion bonds are little affected by temperature.
|
|
