A new method of preparing a rotating ring-disc electrode for the study of carbon supported catalysts

Putten, van; Visscher, Whm Wil; Barendrecht, E Embrecht

doi:10.1016/0022-0728(85)80005-x

Cited by 12 publications

(6 citation statements)

References 13 publications

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“…1 and 2, the results in 0.5 M H,SO, for 20% CoPc, FePc and H,Pc supported on Norit BRX are depicted as a function of the pyrolysis temperature. As reported previously [21], the pure diffusion-limited currents (750 pA at 9 s-' for 0, + H,O,) are not reached since a fraction of the electrode is not covered with carbon particles. The activity of CoPc increases up to a treatment temperature of 600°C: at higher temperatures, however, degradation of the catalyst occurs with loss of performance.…”

Section: Resultsmentioning

confidence: 67%

“…In a few cases, the pyrolysis was done in Ar. The pyrolysed catalysts were ground in an agate mortar and 0.25 mg was attached to the gold disc (0.5 cm') of a RRDE (Au disc, Pt ring, N = 0.23) via incorporation in a polypyrrole film according to the described procedure [21]. The electrochemical experiments were conducted in a standard three-compartment electrochemical cell, filled with 150 ml of O,-saturated 0.5 M H,SO,.…”

Section: Methodsmentioning

confidence: 99%

“…The 0, reduction was measured at 20°C by scanning the potential from 1000 to 200 mV (vs. RHE) with 10 mV s-l, at a rotation frequency of 9 s-'. The disc current was corrected for the high capacitive polypyrrole background current [21].…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, the actual surface area where the electrochemical processes take place is not known exactly and depends on the wetting properties of the catalyst system. Therefore, a different type of electrode was used, developed in our laboratory [21].…”

Section: Developed Theories For Activity Enhancementmentioning

confidence: 99%

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Oxygen reduction on pyrolysed carbon-supported transition metal chelates

Putten

Elzing

Visscher

et al. 1986

Journal of Electroanalytical Chemistry and Interfacial Electroc

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A review is given of the pyrolysis behaviour of carbon-supported transition metal chelates and the developed theories explaining the increased activity and stability towards oxygen reduction. Additional measurements with a new carbon-modified rotating ring-disc electrode show that the central metal ion-N, unit remains the active site after pyrolysis. The selectivity is increased after pyrolysis since relatively less H,O, is detected at the ring. The number of available active sites is an important parameter for the resulting activity. During the heat treatment, different processes take place: migration of the chelates over the carbon support, increasing the number of available active sites; reaction of the outer fringes of the organic skeleton retaining the metal ion-N, unit; and degradation of the catalyst with loss of activity. The condition of the pyrolysed catalyst and its corresponding activity are determined by the relative rate of these processes at the given pyrolysis temperature.

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Section: Resultsmentioning

confidence: 67%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Developed Theories For Activity Enhancementmentioning

confidence: 99%

See 2 more Smart Citations

Oxygen reduction on pyrolysed carbon-supported transition metal chelates

Putten

Elzing

Visscher

et al. 1986

Journal of Electroanalytical Chemistry and Interfacial Electroc

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“…7 ' 8 Test performance evaluations in a full H2/O2 fuel cell are time consuming, and quick evaluation of the activity of possible potential electrocatalysts by a simple technique is desirable. To do so, the RDE technique appears promising and various methods have been proposed to hold the electrocatalyst on the diskY 2 We recently tested pyrolyzed cobalt phthalocyanine (CoPc) in sulfuric acid as a possible alternative to platinum catalysts for the reduction of oxygen at the cathode in SPEFCs.13'~4 Previously, we evaluated the electrocatalytic properties of pyrolyzed CoPc following the'RDE method proposed by Van der Putten et al 15 In that method, electropolymerized pyrrole was used to hold the electrocatalyst particles over the disk electrode. However, this method suffers from some limitations, since the electropolymerization of pyrrole occurring at some active sites of the catalyst may interfere with the activity.…”

mentioning

confidence: 99%

Electrocatalytic Activity of Nafion‐Impregnated Pyrolyzed Cobalt Phthalocyanine: A Correlative Study Between Rotating Disk and Solid Polymer Electrolyte Fuel‐Cell Electrodes

TamizhMani

Dodelet

Guay

et al. 1994

J. Electrochem. Soc.

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Carbon supported electrocatalysts for the reduction of oxygen can be screened quickly by using a rotating disk electrode (RDE) when an appropriate material is used as a binder to hold the catalyst on the disk electrode. The results obtained with the RDE in an oxygen-saturated H2SO4 solution mimic those measured for a full-cell H2/O2 solid polymer electrolyte setup. This result is demonstrated with a cobalt phthalocyanine-on-carbon black catalyst pyrolyzed at various temperatures ranging from 400 to ll00~ When the catalyst is held on the disk electrode with electropolymerized pyrrole, a broad maximum of activity for the reduction of oxygen is observed for pyrolysis temperatures ranging between 600 and 900~ When the catalyst is dispersed in a Nation film on the disk electrode, a sharp maximum in its activity is observed at the pyrolysis temperature of 600~ in agreement with its behavior in a full-cell setup.

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Electrocatalytic aspects of electrogenerated polymer layers

Barendrecht

Elzing

Janssen

et al. 1987

Makromolekulare Chemie. Macromolecular Symposia

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Two main aspects of electrocatalysis of electrogenerated polymer layers (polypyrrole in this case) are presented here. The first aspect concerns the electrogenerated conducting polypyrrole layer as such; i.e. its preparation with built‐in electrocatalysts, like Pt or metal‐organic complexes. Its properties are discussed in terms of their real electrocatalytic behaviour, viz. their turn‐over numbers. The second part deals with specific studies like: ‐ the anodic oxidation of hydrogen with built‐in Pt, and, ‐ the cathodic reduction of oxygen with Co and/or Fe‐phthalocyanines. The theoretical model predicts rather well the experimental behaviour.

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A new method of preparing a rotating ring-disc electrode for the study of carbon supported catalysts

Cited by 12 publications

References 13 publications

Oxygen reduction on pyrolysed carbon-supported transition metal chelates

Oxygen reduction on pyrolysed carbon-supported transition metal chelates

Electrocatalytic Activity of Nafion‐Impregnated Pyrolyzed Cobalt Phthalocyanine: A Correlative Study Between Rotating Disk and Solid Polymer Electrolyte Fuel‐Cell Electrodes

Electrocatalytic aspects of electrogenerated polymer layers

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