Hydrothermal synthesis of bimetallic platinum-nickel powders and their structural characteristics

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The processes of combined reduction of platinum and nickel complex compounds from ammonia-alkaline aqueous solutions with hydrazine hydrate under hydrothermal autoclave conditions are studied. It was established that quantitative precipitation of nickel and platinum occurred within 1 hour at a temperature of 110°C. All phases formed during the reduction had the fcc lattices and exhibited ferromagnetic properties. X-ray phase analysis has proven the formation of solid platinum-nickel substitution solutions. The molar ratio of nickel to platinum was varied from 16/1 to 0.5/1, and in all cases the formation of two phases of the solid nickel-platinum substitution solution was found out: one of variable composition depending on the initial molar ratio of nickel and platinum, with a lattice parameter of 3.622–3.772 Å, which corresponds to 25–62 at. % of platinum; and the second one, enriched in platinum, of practically unchanged composition (90–95 at. %) with a parameter of 3.885–3.901 Å. At ratios from 16/1 to 1/1, in addition to two phases of the solid solution, a nickel phase with a crystal lattice parameter of 3.527 Å was clearly recorded. When the initial ratio of nickel to platinum was 0.5/1, an individual phase of metallic nickel was not detected. It was found that under hydrothermal conditions, nickel dissolved in a solution of 1 M hydrochloric acid, and solid solutions were chemically and structurally stable.

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O. Belousov

Institute of Chemistry and Chemical Technology; Siberian Branch of the Russian Academy of Sciences, Siberian Federal University

Email: roma_boris@list.ru
俄罗斯联邦, Akademgorodok, 50/24, Krasnoyarsk, 660036; Svobodny Ave., 79, Krasnoyarsk, 660041

N. Belousova

Siberian Federal University

Email: roma_boris@list.ru
俄罗斯联邦, Svobodny Ave., 79, Krasnoyarsk, 660041

R. Borisov

Institute of Chemistry and Chemical Technology; Siberian Branch of the Russian Academy of Sciences, Siberian Federal University

编辑信件的主要联系方式.
Email: roma_boris@list.ru
俄罗斯联邦, Akademgorodok, 50/24, Krasnoyarsk, 660036; Svobodny Ave., 79, Krasnoyarsk, 660041

A. Zhizhaev

Institute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences

Email: roma_boris@list.ru
俄罗斯联邦, Akademgorodok, 50/24, Krasnoyarsk, 660036

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2. Fig. 1. Fragments of X-ray diffraction patterns of sample 4: 1 – synthesized for 1 hour at a temperature of 110°C, molar ratio nNi : nPt = 4 : 1; 2 – material after treatment of the solid phase with 1 M hydrochloric acid.

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3. Fig. 2. Dependence of the crystal lattice parameter of the β-phase on the logarithm of the molar ratio Ni: Pt.

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4. Рис. 3. Зависимость количества фазы Ni(0) в твердой фазе от логарифма мольного соотношения Ni : Pt.

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5. Fig. 4. SEM image, element distribution maps and Ni:Pt atomic ratio at different points: a – sample 4; b – sample 7.

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6. Fig. 5. SEM image of Ni, Pt material, sample 4 after treatment in 1 M HCl.

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