1962
DOI: 10.1149/1.2425569
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Rest Potentials in the Platinum-Oxygen-Acid System

Abstract: The rest potential of a platinum bead electrode in oxygen-stirred acid solution was investigated as a function of the pH, the partial pressure of oxygen, and the history of electrode preparation. It is believed that the theoretical equilibrium oxygen potential, +1.229v vs. N.H.E., cannot be obtained in any ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 131.215.225.9 Downloaded on 2015-05-28 to IP Vol. 109, No. 9 REST POTENTIALS … Show more

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Cited by 105 publications
(75 citation statements)
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“…formation of the peroxide ion, might be the dominant reaction with a much lower equilibrium voltage, similar to the low open circuit voltage observed in low temperature fuels cells like the polymer electrolyte membrane fuel cell (PEMFC). 46,47 Cell performance.-The cell responds to pO 2 variations rapidly as shown in Figure 5. The volume of the test setup is ca.…”
Section: Discussionmentioning
confidence: 99%
“…formation of the peroxide ion, might be the dominant reaction with a much lower equilibrium voltage, similar to the low open circuit voltage observed in low temperature fuels cells like the polymer electrolyte membrane fuel cell (PEMFC). 46,47 Cell performance.-The cell responds to pO 2 variations rapidly as shown in Figure 5. The volume of the test setup is ca.…”
Section: Discussionmentioning
confidence: 99%
“…The difference between the theoretical and measured OCVs is mainly caused by two different drops in potential ( E OCV Pt−O 2 and E OCV H 2 −xover as listed in Table 2). One drop ( E OCV Pt−O 2 ) is caused by a reaction between the Pt surface and O 2 , resulting in a mixed cathode potential (E OCV mixed ) [12,[18][19][20]35], and the other drop ( E OCV H 2 −xover ) is caused by H 2 crossover from the anode to cathode, reacting with O 2 reducing the O 2 surface concentration, resulting in a decrease in the E r c value by an amount equivalent to E OCV H 2 −xover . For a mixed cathode potential, a local-cell mechanism has been put forward to explain the Pt-O 2 reaction mechanism at the electrode in an O 2 saturated acidic solution [18,35,40,41].…”
Section: Fuel Cell Ocvmentioning
confidence: 99%
“…A mixed potential [15][16][17][18] was widely used to interpret the lower open circuit voltage in an acidic medium, when compared to the thermodynamic value of the oxygen electrode (about 1.23 V versus NHE at 25 • C). This mixed potential is a result of the cathodic four-electron oxygen reduction reaction (ORR), and the anodic oxidation that is considered to be either Pt oxidation [18] or the oxidation of impurities [15]. Parthasarathy et al [12,19,20] employed a micro Pt electrode coated with a thin Nafion membrane, which is similar to a fuel cell cathode/membrane environment, and observed behaviour of the open circuit voltage.…”
Section: Introductionmentioning
confidence: 99%
“…Therefore, a "mixed potential" with some intermediate value in the 0.9 to 1.23 V range should be observed on Pt-electrodes. The stationary potential with values within narrow 1.17-1.16 V (versus RHE) interval was observed in experimental studies [23,24]; it was explained by the studies' author as manifestation of the "mixed potential". Let us note that potential of cathodic reaction (2) remains practically unchanged value in a course of reaction (11) in the oxygen atmosphere.…”
Section: Energy Characteristics Of Electrochemical Reactions Of Surfamentioning
confidence: 85%
“…As a result, the averaged potential, mix , at which reaction (11)) may proceed is established. Similar methods of calculation of parameter mix ("mixed potential") were used in studies [23,24] for investigation of stationary potentials on Ptelectrodes in 2 N H 2 SO 4 . The studies' author assumed that platinum surface is not inert in relation to molecular oxygen and that reaction Pt-O + 2H + + 2e − ↔ Pt + H 2 O is realized in acidic solutions.…”
Section: Energy Characteristics Of Electrochemical Reactions Of Surfamentioning
confidence: 99%