THE ELECTRODE BEHAVIOR OF PLATINUM

1953 ◽  
Vol 31 (7) ◽  
pp. 665-672
Author(s):  
A. K. Wiebe ◽  
C. A. Winkler
Keyword(s):  
Sulphuric Acid ◽  
Saturated Calomel Electrode ◽  
Platinum Electrodes ◽  
Platinum Surface ◽  
Surface Areas ◽  
The Times

A potential of −0.305 ± 0.005 volt (relative to a saturated calomel electrode) was obtained at a freshly prepared platinum surface within 30 sec. of immersion in oxygen-free N/5 sulphuric acid saturated with hydrogen. In electrolytes saturated with nitrogen or oxygen potentials of +0.05 ± 0.01 volt and +0.745 ± 0.005 volt respectively were more slowly attained. The times required for the electrode to reach maximum potentials, tmax, when it was made a cathode, and corresponding values of tmax when it was rendered anodic, were determined over a range of currents. The values of tmax appear to provide a method of determining the surface areas of platinum electrodes.

THE ELECTRODE BEHAVIOR OF COPPER

1953 ◽  
Vol 31 (11) ◽  
pp. 1118-1126 ◽  
Author(s):  
A. K. Wiebe ◽  
C. A. Winkler
Keyword(s):  
Sulphuric Acid ◽  
Electrode Surface ◽  
Copper Cathode ◽  
Dissolved Gas ◽  
Copper Electrodes ◽  
Surface Areas ◽  
Potential Decay ◽  
The Times ◽  
First Time ◽  
Subsequent Passage

Potentials ranging from −0.063 volt to +0.044 volt were observed for freshly prepared copper electrodes in sulphuric acid. The potential was dependent upon concentration of the electrolyte, the gas with which the electrolyte was saturated, the nature of the electrode surface, and the intensity of the stirring. The rate of potential decay was influenced by the nature of the dissolved gas and concentration of the electrolyte. When current was passed for the first time across a freshly prepared electrode face, the potential build-up was nonlinear, but subsequent passage of current gave a linear build-up of potential. The apparent capacitance at a copper cathode increased with the time allowed for the potential to decay after current had been passed. It was also dependent upon the current used to measure it, and appeared to be somewhat affected by the area of the cathode. Reliable estimates of the surface areas of the electrodes appeared to be possible from the times required for the electrodes to reach maximum potentials.

Cerebral Tissue Response in Chronic Electrode Implantation

1977 ◽  
Vol 35 ◽  
pp. 624-625
Author(s):  
R.F. Dodson ◽  
L.W-F Chu ◽  
N. Ishihara
Keyword(s):  
Tissue Response ◽  
Whole Body ◽  
Platinum Electrodes ◽  
Fixed Tissue ◽  
Electrode Implantation ◽  
Surface Areas ◽  
Tissue Changes ◽  
Micron Diameter ◽  
Extent Of Damage ◽  
Electrode Sheath

The extent of damage surrounding an implanted electrode in the cerebral cortex is a question of significant importance with regard to attaining consistency and validity of physiological recordings. In order to determine the extent of such tissue changes, 150 micron diameter platinum electrodes were implanted in the cortex of four adult baboons, and after eight days the animals were sacrificed by whole body perfusion with a 3% glutaraldehyde in 0.1M phosphate fixative.The calvarium was carefully removed and the electrode tracts were readily discernible in the firm, glutaraldehyde fixed tissue.Careful dissection of the zone of the electrode tract resulted in a small block which was further sectioned into tip, mid-tract and surface areas. Ultrastructurally, damage extended from the electrode sheath to the greatest extent of from 0.2 to 3.5 mm.

In-situ IR study by MIRFTIRS of adsorption and oxidation of methanol on sputtered platinum electrodes in sulphuric acid solution

1990 ◽  
Vol 282 (1-2) ◽  
pp. 287-294 ◽  
Author(s):  
Minh-Chau Pham ◽  
Jamal Moslih ◽  
Monique Simon ◽  
Pierre-Camille Lacaze
Keyword(s):  
Acid Solution ◽  
Sulphuric Acid ◽  
Sulphuric Acid Solution ◽  
Platinum Electrodes ◽  
Oxidation Of Methanol ◽  
In Situ Ir ◽  
Ir Study

Electrochemical behaviour of oxocarbons on single crystal platinum electrodes Part IV. Rhodizonic acid in 0.5 M sulphuric acid medium

1997 ◽  
Vol 424 (1-2) ◽  
pp. 185-196 ◽  
Author(s):  
R. Carbó ◽  
R. Albalat ◽  
J. Claret ◽  
J.M. Orts ◽  
A. Rodes
Keyword(s):  
Single Crystal ◽  
Acid Medium ◽  
Sulphuric Acid ◽  
Electrochemical Behaviour ◽  
Platinum Electrodes ◽  
Sulphuric Acid Medium

Heterogeneously assisted oxidation of adsorbates from carbonmonoxide, methanol and ethanol by hydrogen peroxide solutions on platinum electrodes in sulphuric acid

2006 ◽  
Vol 36 (11) ◽  
pp. 1271-1279 ◽  
Author(s):  
J.L. Rodríguez ◽  
E. Pastor ◽  
C.F. Zinola ◽  
V.M. Schmidt
Keyword(s):  
Hydrogen Peroxide ◽  
Sulphuric Acid ◽  
Platinum Electrodes

The rest potential of platinum electrodes in oxygensaturated 1 M sulphuric acid

1973 ◽  
Vol 47 (2) ◽  
pp. 353-361 ◽  
Author(s):  
D.A.J. Rand ◽  
R. Woods
Keyword(s):  
Sulphuric Acid ◽  
Platinum Electrodes ◽  
Rest Potential
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