Electrocatalysis by amorphous metals of hydrogen and oxygen evolution in alkaline solution

Kreysa, G.; Hȧkansson, Bo

doi:10.1016/0022-0728(86)90088-4

Cited by 136 publications

(80 citation statements)

References 63 publications

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“…These values are more comparable to the results obtained by Kreysa and Hakansson [15] for the G14 alloy (of similar composition) than those obtained by Crousier et al [13] and Alemu and Juttner [14]. The surface preparation of the alloy will affect the result obtained.…”

Section: Acidic Pre-treatment Of Electrodessupporting

confidence: 87%

“…Crousier et al [13] obtained an exchange current of 1.2 · 10 )7 Acm )2 at glassy Fe 40 Ni 40 P 14 B 6 in 1 M KOH (25°C) that agrees with the value obtained in this study in the high overpotential region while the Tafel slope reported (109 mV) was 37 mV higher than the slope obtained in this study ( Table 2). The exchange current density (1.3 · 10 )4 Acm )2 ) and Tafel slope (174 mV) obtained by Kreysa and Hakanson [15] for HE at glassy Fe 40 Ni 40 B 20 did not agree with the values obtained in this study in either overpotential region (Table 2). …”

Section: Electrocatalytic Behaviourcontrasting

confidence: 78%

“…Clearly further investigation of the effect of P is required. Only single Tafel values were reported in the literature for HE by the glassy Fe 40 Ni 40 P 14 B 6 [13] and Fe 40 Ni 40 B 20 [15] (Table 2). In general the kinetic parameters in the lower overpotential region are less widely reported.…”

Section: Electrocatalytic Behaviourmentioning

confidence: 87%

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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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Section: Acidic Pre-treatment Of Electrodessupporting

confidence: 87%

Section: Electrocatalytic Behaviourcontrasting

confidence: 78%

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The electrochemical and electrocatalytic behaviour of glassy metals

2005

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“…Ni-Co amor phous al loys pres ent an electrocatalytic activ ity on the OER in al ka line so lu tion which is higher than that of their crys tal line coun ter parts [1][2][3][4][5][6][7][8], and ref er ence therein . The use of these ma te ri als re quires a sat is fac tory re sis tance to gen eral and lo cal ized cor ro sion.…”

Section: Introductionmentioning

confidence: 99%

An electrochemical study of the corrosion processes of Ni-based glassy metals in aqueous solutions

Barbosa

Gassa

1997

J. Braz. Chem. Soc.

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O comportamento eletroquímico de ligas amorfas Ni-Co em soluções de carbonato/bicarbonato foi investigado usando espectroscopia de impedância eletroquímica combinada com voltametria e técnicas de polarização estacionárias. Os resultados indicam que a cinética do processo de dissolução é dependente do pH e da força iônica da solução eletrolítica. A composição do metal vítreo é um fator importante na determinação dos parâmetros cinéticos envolvidos no complexo comportamento eletroquímico desses materiais.The elec tro chem i cal be hav ior of amor phous Ni-Co al loys in car bon ate/bi car bon ate so lutions was in ves ti gated us ing elec tro chem i cal im ped ance spec tros copy com bined with voltammetry and sta tion ary po lar iza tion tech niques. The re sults in di cate that the ki net i cs of the dis so lu tion pro cesses are de pend ent on the pH and ionic strength of the elec tro lyte. The co m posi tion of the glassy metal is an im por tant fac tor in de ter min ing the ki netic pa ram e ters in volved in the com plex elec tro chem i cal be hav ior of these ma te ri als. Key words: im ped ance spec tros copy, glassy met als, Ni-Co al loys In tro duc tionNi-Co amor phous al loys pres ent an electrocatalytic activ ity on the OER in al ka line so lu tion which is higher than that of their crys tal line coun ter parts 1-8, and ref er ence therein . The use of these ma te ri als re quires a sat is fac tory re sis tance to gen eral and lo cal ized cor ro sion. It has been found 9 that the cor ro sion be hav ior of dif fer ent polycrystalline Ni-Co alloys is a func tion of al loy com po si tion.A cor ro sion study of Ni-Co based glassy met als in carbon ate-bicarbonate so lu tions at pH 8.9 showed that the disso lu tion pro cesses are de pend ent on the ionic strength of the elec tro lyte 10 . The pres ent study was un der taken in or der to eval u ate the in flu ence of the pH and ionic strength of the elec tro lyte, as well as the al loy com po si tion, on the cor ro sion be hav ior of a glassy Ni-based al loy (Vitrovac 0080), and to com pare these re sults with Ni-Co based al loys. Ex per i men talAmor phous al loys (Vakuumschmelze GmbH, Hanau) with the com po si tions Vitrovac 0080 (Ni 78 B14 Si 8), G15 (Ni 58 Co 20 B12 Si 10 ) and G16(Ni 25 Co 50 B10 Si 15 ), were employed as the work ing elec trodes. A con ven tional three-compartment glass cell was used with a large area Pt coun ter elec trode and a cal o mel ref er ence elec trode. Po tentials in the text are re ferred to the nor mal hy dro gen electrode (NHE) scale.Elec tro chem i cal im ped ance spec tros copy (EIS) combined with steady-state cur rent den sity/po ten tial (j/E) curves, and sin gle (STPS) and re pet i tive (RTPS) tri an gu lar po ten tial sweeps, were per formed un der pu ri fied N 2 gas sat u ra tion in the fol low ing so lu tions: x M KHCO 3 + y M K2CO 3 (0.75 ≤ x ≤ 2.5; 0.05 ≤ y ≤ 0.5), cov er ing the 8.3-10.5 pH range at 25 °C.Ar ti cle

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“…S7 †) shows the presence of a redox couple which can be also attributed to surface iron species, however this time at a more cathodic potential due to the higher pH of 1 M KOH. 55,56 Although the water windows are notably decreased by the addition of iron in both H 2 SO 4 and KOH, they remain at, stable and relatively wide.…”

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confidence: 99%

Characterization and electrochemical properties of iron-doped tetrahedral amorphous carbon (ta-C) thin films

2018

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a Iron-doped tetrahedral amorphous carbon thin films (Fe/ta-C) were deposited with varying iron content using a pulsed filtered cathodic vacuum arc system (p-FCVA). The aim of this study was to understand effects of iron on both the physical and electrochemical properties of the otherwise inert sp 3 -rich ta-C matrix. As indicated by X-ray photoelectron spectroscopy (XPS), even $0.4 at% surface iron had a profound electrochemical impact on both the potential window of ta-C in H 2 SO 4 and KOH, as well as pseudocapacitance. It also substantially enhanced the electron transport and re-enabled facile outer sphere redox reaction kinetics in comparison to un-doped ta-C, as measured with electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) using outer-sphere probes Ru(NH 3 ) 6 , IrCl 6 , and FcMeOH. These increases in surface iron loading were linked to increased surface oxygen content and iron oxides. Unlike few other metals, an iron content even up to 10 at% was not found to result in the formation of sp 2 -rich amorphous carbon films as investigated by Raman spectroscopy. Atomic force microscopy (AFM) and transmission electron microscopy (TEM) investigations found all films to be amorphous and ultrasmooth with R q values always in the range of 0.1-0.2 nm. As even very small amounts of Fe were shown to dominate the electrochemistry of ta-C, implications of this study are very useful e.g. in carbon nanostructure synthesis, where irregular traces of iron can be readily incorporated into the final structures.

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Electrocatalysis by amorphous metals of hydrogen and oxygen evolution in alkaline solution

Cited by 136 publications

References 63 publications

The electrochemical and electrocatalytic behaviour of glassy metals

The electrochemical and electrocatalytic behaviour of glassy metals

An electrochemical study of the corrosion processes of Ni-based glassy metals in aqueous solutions

Characterization and electrochemical properties of iron-doped tetrahedral amorphous carbon (ta-C) thin films

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