Amorphous PdZr alloys for water electrolysis cathode materials

Enyo, M.; Yamazaki, Tadayoshi; Kaufmann, Kai; Suzuki, Ken

doi:10.1016/0013-4686(83)85218-9

Cited by 57 publications

(15 citation statements)

References 16 publications

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“…Heat gen adsorption/desorption peaks on the surface of the Pd alloys are observed at potentials of +0.04 V vs. NHE showing a similar behavior to that of Pt [10,28,31]. Moreover, the formation of surface oxy species which are the poisoning species for oxygen reduction were not observed and this may be beneficial to the oxygen adsorption at low overpotential and thus the ORR kinetic enhancement.…”

Section: Catalystsupporting

confidence: 59%

“…The Pd/CDX975 electrocatalyst exhibited anodic peak at +0.25 V vs. NHE. This is caused by dissolution of adsorbed hydrogen into the bulk of the Pd catalyst [28,29]. As in the case of Pd, surface palladium oxides (Pd-OH or PdO x species) at the potentials of +0.8 V vs. NHE during anodic scan and the corresponding reduction peaks of surface paladium oxides were observed at around +0.7 V vs. NHE during the cathodic scan.…”

Section: Direct Ethanol Fuel Cell Testsmentioning

confidence: 98%

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Carbon supported Pd–Co–Mo alloy as an alternative to Pt for oxygen reduction in direct ethanol fuel cells

Rao

Viswanathan

2010

Electrochimica Acta

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Section: Catalystsupporting

confidence: 59%

Section: Direct Ethanol Fuel Cell Testsmentioning

confidence: 98%

Carbon supported Pd–Co–Mo alloy as an alternative to Pt for oxygen reduction in direct ethanol fuel cells

Rao

Viswanathan

2010

Electrochimica Acta

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“…On the other hand pre-treatment of glassy alloys has been found to activate the alloy surfaces for electrocatalytic reactions, such as HE and oxygen evolution. Chemical pre-treatment of certain glassy alloys with strong oxidising acids increases their effective surface area by selectively dissolving surface oxides and one or more of the alloy components to produce a roughened or porous surface with a greater surface area at which HE can occur [8][9][10][11]. An apparent increase in current density results from the greater electrode surface area.…”

Section: Introductionmentioning

confidence: 96%

The electrochemical and electrocatalytic behaviour of glassy metals

2005

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The suitability of a selection of amorphous alloys as electrocatalysts or as inhibitors for hydrogen evolution (HE) was investigated in 1 M KOH at 25°C. Mild basic conditions were chosen so as to make direct comparison with other data, where available. The alloys studied were the known glassy alloys Fe 67 Co 18 B 14 Si 1 , Co 66 Fe 4 Si 16 B 12 Mo 2 , Fe 40 Ni 40 B 20 and Fe 40 Ni 40 P 14 B 6 and an entirely new glassy alloy Zr 73.22 Ti 19.71 Cu 1.24 Fe 5.83 . The electrochemical techniques of slow sweep anodic and cathodic polarisation were used, in conjunction with the surface analysis techniques of scanning electron microscopy (SEM) and X-ray analysis, to characterise the alloys and new data has been obtained for all alloys. The glassy alloys were tested in their as-polished state, as well as after surface activation, by ex situ chemical (acid etching) and in situ electrochemical (anodic oxidation in base) pre-treatment. The least corrosion resistant composition, Fe 67 Co 18 B 14 Si 1 , displayed the highest activity for HE in the as-polished state and only a minor improvement resulted from surface pre-treatment. Corrosion resistance was partly characterised by the degree to which the passive region increased and the passive region current decreased as a function of pre-treatment. The most corrosion resistant alloy, Zr 73.22 Ti 19.71 Cu 1.24 Fe 5.83 , displayed the poorest activity for HE in the as-polished state, but a significant improvement resulted from surface activation by in situ anodic oxidation in basic media. Surface activation by acid pre-treatment reduced the corrosion resistance of the Zr 73.22 Ti 19.71 Cu 1.24 Fe 5.83 alloy and was, therefore, a non-viable and destructive procedure. However, acid pre-treatment was effective in substantially activating the glassy Co 66 Fe 4 Si 16 B 12 Mo 2 and Fe 40 Ni 40 P 14 B 6 alloys towards HE and did not alter the corrosion properties of these compositions. A novel technique for mounting thin alloy specimens has been developed, using an insulating photo-resist coating, resulting in sharply defined electrode edges.

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“…One of them is that the substitution of Zr for Mg is favourable for the formation of an amorphous phase in the alloy because amorphous alloys have not only excellent electrocatalytic activity [18] but also corrosion resistance behaviour [19]. One the other hand, the zirconium oxide on the alloy surface can selectively be dissolved in strong alkaline solution [20], and a porous electrocatalytically active Ni layer remains on almost the whole electrode surface by which the cycle stability of the MA Mg 2 Ni-type alloys were significantly improved.…”

Section: Cycle Stabilitymentioning

confidence: 99%