The Development of an Energy‐Efficient Insoluble Anode for Nickel Electrowinning: II . Multilayer Precious Metal Coatings

Scarpellino, A. J.; Fisher, Gregory L.

doi:10.1149/1.2123892

Cited by 7 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Literature data on the long term stability of catalysts used in the oxygen evolution reaction in acidic electrolyte solution are scant. Scarpellino et al have studied the corrosion behaviour of thermally stabilised ruthenium catalysts [36]. Ruthenium tempered at air and at 400-600 ~ shows a smaller corrosion rate than catalysts not tempered, no further data in particular indicating electrochemical stability were available.…”

Section: Lifetime Testingmentioning

confidence: 99%

Bifunctional electrodes for an integrated water-electrolysis and hydrogen-oxygen fuel cell with a solid polymer electrolyte

Ahn

Holze

1992

J Appl Electrochem

View full text Add to dashboard Cite

An alternative concept of an integrated water electrolysis/hydrogen-hydrogen fuel cell using metal electrocatalysts and a solid polymer electrolyte is described. Instead of operating both electrodes as hydrogen and oxygen electrodes respectively the electrodes are used as oxidation and reduction electrodes in both modes of operation. A more suitable selection of electrocatalysts and an improved cell design are possible; both can increase the efficiency of the cell co/Isiderably. New results on the electrocatalytic activity of various noble-metal containing catalysts with respect to both oxygen evolution and hydrogen oxidation in a proton exchange membrane-cell at 80 ~ are reported. Kinetic data derived from Tafel plots of the oxygen evolution polarization curves agree closely with those of experiments with aqueous sulphuric acid electrodes. This agreement allows the determination of kinetic parameters for electrocatalysts difficult to prepare in solid smooth electrodes but easy to be made into porous deposits. Polarization curves of the hydrogen oxidation reaction clearly indicate a relative activity rating of the studied catalysts. In cycling tests the lifetime stability of the new bifunctional oxidation electrode was determined. Polarization data obtained under these conditions agree with those obtained in earlier experiments where electrodes were exposed to only one type of oxidation reaction. During a test of 10 cycles (30 min of electrolyser and 30 min of fuel cell mode each) no changes in the electrode potential were observed. With the conventional cell design employing a hydrogen and an oxygen electrode both catalyzed with platinum and a current density of 100 mA cm-2 a storage efficiency of 50% was calculated; with the alternative concept of oxidation and reduction electrodes and selected oxidation catalysts this was improved to 57%. With further improvements these efficiencies seem possible even at current densities of 500 mAcm -2.

show abstract

Section: Lifetime Testingmentioning

confidence: 99%

Bifunctional electrodes for an integrated water-electrolysis and hydrogen-oxygen fuel cell with a solid polymer electrolyte

Ahn

Holze

1992

J Appl Electrochem

View full text Add to dashboard Cite

show abstract

“…Another approach to reduce the oxygen overvoltages, is the use of electrocatalysts. Some semiconducting oxides, such as NiCo 2 O 4 , give quite good performance towards hydroxide, but the best anodes described in literature seem to be those based on Ir/RuO 2 coatings of Ti which give current densities at an overpotential of 200 mV [7,8].…”

Section: Introductionmentioning

confidence: 99%

Comparison between the electrocatalytic properties of different metal ion phthalocyanines and porphyrins towards the oxidation of hydroxide

Wael

Adriaens

2008

Talanta

View full text Add to dashboard Cite

This work reports on the electrocatalytic oxidation of hydroxide using different central metal ion phthalocyanines and porphyrins immobilized on gold electrodes. The apparent electrocatalytic activity of cobalt phthalocyanine or porphyrin modified electrodes was found to be the greatest among the present series of metal ion macrocycles investigated. Copper and unmetallated phthalocyanine or porphyrin modified electrodes show no electrocatalytic behaviour towards hydroxide, such as bare gold. A possible mechanism for the enhanced reactivity of cobalt ion macrocycles towards the oxygen evolution is given. It is also stated that the electrocatalytic activity towards an adsorbate involves several aspects, such as the coordination state of the central metal ion, the nature of the ligand, the stability of the complexes, the number of d electrons, the energy of orbitals and the strength of the bonding between the central metal ion and the axial ligand.

show abstract

ChemInform Abstract: THE DEVELOPMENT OF AN ENERGY‐EFFICIENT INSOLUBLE ANODE FOR NICKEL ELECTROWINNING. II. MULTILAYER PRECIOUS METAL COATINGS

Scarpellino¹,

Fisher²

1982

Chemischer Informationsdienst

View full text Add to dashboard Cite

Eine elektrolytisch auf Ti aufgebrachte Ru‐4% Ir‐Schjcht zeigt eine exzellente Aktivität für die O2‐Entwicklung, besitzt aber eine zu geringe Lebensdauer für eine ökonomische Ni‐Gewinnung bei 70°C. Edelmetallschichten aus Pt, Pd oder Ir zwischen Substrat und Ru‐Ir‐Belegung erhöhen allerdings die Lebensdauer der Elektrode in einem simulierten Ni‐Gewinnungstest auf das 5‐l0fache.

show abstract

The Development of an Energy‐Efficient Insoluble Anode for Nickel Electrowinning: II . Multilayer Precious Metal Coatings

Cited by 7 publications

References 3 publications

Bifunctional electrodes for an integrated water-electrolysis and hydrogen-oxygen fuel cell with a solid polymer electrolyte

Bifunctional electrodes for an integrated water-electrolysis and hydrogen-oxygen fuel cell with a solid polymer electrolyte

Comparison between the electrocatalytic properties of different metal ion phthalocyanines and porphyrins towards the oxidation of hydroxide

ChemInform Abstract: THE DEVELOPMENT OF AN ENERGY‐EFFICIENT INSOLUBLE ANODE FOR NICKEL ELECTROWINNING. II. MULTILAYER PRECIOUS METAL COATINGS

Contact Info

Product

Resources

About