Preparation of NiPt Alloys by Galvanic Replacement Reaction on Ni Films for Direct Ethanol Fuel Cell

Pham Van Vinh

Abstract


NiPt alloys were prepared successfully by galvanic replacement reaction on the surface of Ni films. The electrolytic deposition of Ni films was investigated to get the high qualities of Ni films for the galvanic reaction. The influence of the electrolytic currents on the morphology and thickness of Ni films were observed by SEM. The thickness and roughness of the Ni films increase with the increase of electrolytic currents. XRD patterns showed that Ni films were formed in the crystal phase of Ni corresponding to face centered cubic structure. Pure Ni films obtained by annealing the films in hydrogen medium were used to prepare NiPt alloys due to galvanic reaction of Pt2+ with Ni2+ in H2PtCl6 solution. The influence of the H2PtCl6 solution concentration on the composition of NiPt alloys were investigated by EDX. The analyses results showed that NiPt alloy formed by using high solution concentration of H2PtCl6 has high composition of Pt. The electrocatalytic activities of both Ni films and NiPt alloys toward ethanol oxidation in KOH medium were carried out by the cyclic voltammetry measurement. Alloyed samples exhibited high electrocatalytic activities due to carbonaceous removal and weakening Pt-COads bond.

Keywords


galvanic replacement, NiPt alloy nanoparticles, electrolysis deposition, ethanol oxidation, direct fuel cell

References


Zheng, Z., et al., A review on non-model based diagnosis methodologies for PEM fuel cell stacks and systems. International Journal of Hydrogen Energy, 2013. 38(21): p. 8914-8926.

Antoniassi, R.M., et al., Synthesis of Pt nanoparticles with preferential (100) orientation directly on the carbon support for Direct Ethanol Fuel Cell. Journal of Catalysis, 2016. 342: p. 67-74.

Sánchez-Monreal, J., P.A. García-Salaberri, and M. Vera, A genetically optimized kinetic model for ethanol electro-oxidation on Pt-based binary catalysts used in direct ethanol fuel cells. Journal of Power Sources, 2017. 363: p. 341-355.

Takahashi, H., M. Sagihara, and M. Taguchi, Electrochemically reduced Pt oxide thin film as a highly active electrocatalyst for direct ethanol alkaline fuel cell. International Journal of Hydrogen Energy, 2014. 39(32): p. 18424-18432.

Perez, J., V.A. Paganin, and E. Antolini, Particle size effect for ethanol electro-oxidation on Pt/C catalysts in half-cell and in a single direct ethanol fuel cell. Journal of Electroanalytical Chemistry, 2011. 654(1): p. 108-115.

Chung, D.Y., et al., CO electro-oxidation reaction on Pt nanoparticles: Understanding peak multiplicity through thiol derivative molecule adsorption. Catalysis Today, 2017. 293: p. 2-7.

Léger, J.M., et al., Electrosorption of sorbitol at platinum electrodes: Effect of the superficial structure. Journal of Electroanalytical Chemistry, 1993. 356(1): p. 255-267.

Maya-Cornejo, J., et al., PtCu catalyst for the electro-oxidation of ethanol in an alkaline direct alcohol fuel cell. International Journal of Hydrogen Energy, 2017.

Ding, K., et al., Pt–Ni bimetallic composite nanocatalysts prepared by using multi-walled carbon nanotubes as reductants for ethanol oxidation reaction. International Journal of Hydrogen Energy, 2014. 39(31): p. 17622-17633.

Almeida, T.S., et al., An optimization study of PtSn/C catalysts applied to direct ethanol fuel cell: Effect of the preparation method on the electrocatalytic activity of the catalysts. Journal of Power Sources, 2012. 215: p. 53-62.

Pham, V.V., V.-T. Ta, and C. Sunglae, Synthesis of NiPt alloy nanoparticles by galvanic replacement method for direct ethanol fuel cell. International Journal of Hydrogen Energy, 2017. 42(18): p. 13192-13197.

Blyholder, G., Molecular orbital view of chemisorbed carbon monoxide. The Journal of Physical Chemistry, 1964. 68(10): p. 2772-2777.


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