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Spectroscopic study of nickel(II) hydroxide surface modifications induced by a small iron(III) addition (1996)

Kamnev, A. A. ; Smekhnov, Alexander A.

Springer

Fresenius' Zeitschrift für analytische Chemie 355 (1996), S. 710-712

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ISSN: 1618-2650

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract Comparative Auger electron spectroscopic data on the surface composition and depth profiling for β-Ni(OH)2 and Ni(OH)2 coprecipitated with iron(III) (3 at.%) are given showing a non-uniform distribution of the latter. They are considered together with their structural characteristics obtained using Fourier transform infrared spectroscopy (both samples) and Mössbauer spectroscopy (Fe-containing sample). The results obtained provide an explanation for the specific behaviour of the Fe(III)-doped nickel(II) hydroxide in heterogeneous processes (adsorption, electrocatalysis).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s0021663550710

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Application of transmission Mössbauer spectroscopy to the surface study of Ni(II)-Fe(III) hydroxide electrocatalysts: Comparison with AES data (1993)

Kamnev, Alexander A. ; Angelov, Venelin ; Smekhnov, Alexander A.

Chichester [u.a.] : Wiley-Blackwell

Surface and Interface Analysis 20 (1993), S. 949-954

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ISSN: 0142-2421

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Physics

Notes: Transmission Móssbauer spectra of binary coprecipitated nickel(II)-iron(III) hydroxides (molar ratios 9:1 and 4:1) are analysed and compared with the results of AES analyses of their surface composition. A correlation between the data of the above techniques has been noted, indicating a redistribution of the components (i.e. Ni and Fe) in the surface layers, the latter being enriched with iron(III) as compared to the bulk. The results obtained are in good agreement with an excellent electrocatalytic activity of composite Ni-Fe hydroxide systems towards anodic oxygen evolution in alkaline electrolytes, taking into account a distinctly exhibited ‘surface’ electrocatalytic effect of ferric species on the nickel hydroxide electrode in the anodic oxygen evolution process revealed previously. Transmission Móssbauer spectroscopy has been shown to be a highly effective probe sensitive both to various bulk and surface effects related to the solid phases studied.

Additional Material: 3 Ill.