TY - JOUR

T1 - Study of the Formation Features of Pt(0) Nanoparticles at the Interface of Nickel–Aqueous Solution of Reagents under SILD Conditions and Their Electrocatalytic Properties in Hydrogen Evolution Reaction during Water Electrolysis in an Alkaline Medium

AU - Толстой, Валерий Павлович

AU - Гулина, Лариса Борисовна

AU - Канева, Мария Витальевна

PY - 2024/5/6

Y1 - 2024/5/6

N2 - The article explores the features of Pt(0) nanoparticle formation at the interface of nickel-aqueous solution of reagents and a similar interface containing nanoflakes of Co(OH)2. The synthesis was carried outunder Successive Ionic Layers Deposition (SILD) conditions, and solutions of Na2PtCl6, CoCl2, and NaBH4 were used as the reagents. Pt(0) nanolayers were produced on the nickel surface using Na2PtCl6 and NaBH4 solutions, and for Co(OH)2 nanolayers CoCl2 and NaBH4 solutions were used. Structural chemicalstudies of the samples synthesized were performed by HRTEM, FESEM, EDX, SAED, XPS, FT-IR, and Raman spectroscopy. It was shown that Pt(0) nanolayers consist of separate nanoparticles, while Co(OH)2 nanolayers consist of nanoflakes. The main attention in the work is paid to the formation features of Pt(0) nanoparticles on a nickel surface to which a nanolayer of Co(OH)2 was previously applied. The study of the electrocatalytic properties of such samples in the hydrogen evolution reaction (HER) during water electrolysisin the alkaline medium showed that the best properties are exhibited by nanoparticles synthesized after 20–40 SILD cycles and on nickel substrates with Co(OH)2 nanolayers applied in advance. Also, it was foundthat among these samples the best properties are displayed by those containing Co(OH)2 layers synthesized after 5 SILD cycles. One of the best examples of this series was obtained from 40 SILD cycles and is characterizedby the overpotential value at 29 mV of current density at 10 mA/cm2, the Tafel slope value at 29.5 mV/dec, and high stability of these values at multiple cycle potential. It is noted that the Pt(0) nanoparticles synthesized after 40 SILD cycles are 4–8 nm in size and are located on the surface of the nanoflakes ata distance of about 10 nm from each other for the nickel foam sample, on the surface of which a Co(OH)2 nanolayer was synthesized as a result of 5 SILD cycles. These features contribute to the formation of a set of Pt(0) nanoparticle contact points with the surface of Co(OH)2 nanoflakes, which determines the high electrocatalytic activity and stability of properties of such structures.

AB - The article explores the features of Pt(0) nanoparticle formation at the interface of nickel-aqueous solution of reagents and a similar interface containing nanoflakes of Co(OH)2. The synthesis was carried outunder Successive Ionic Layers Deposition (SILD) conditions, and solutions of Na2PtCl6, CoCl2, and NaBH4 were used as the reagents. Pt(0) nanolayers were produced on the nickel surface using Na2PtCl6 and NaBH4 solutions, and for Co(OH)2 nanolayers CoCl2 and NaBH4 solutions were used. Structural chemicalstudies of the samples synthesized were performed by HRTEM, FESEM, EDX, SAED, XPS, FT-IR, and Raman spectroscopy. It was shown that Pt(0) nanolayers consist of separate nanoparticles, while Co(OH)2 nanolayers consist of nanoflakes. The main attention in the work is paid to the formation features of Pt(0) nanoparticles on a nickel surface to which a nanolayer of Co(OH)2 was previously applied. The study of the electrocatalytic properties of such samples in the hydrogen evolution reaction (HER) during water electrolysisin the alkaline medium showed that the best properties are exhibited by nanoparticles synthesized after 20–40 SILD cycles and on nickel substrates with Co(OH)2 nanolayers applied in advance. Also, it was foundthat among these samples the best properties are displayed by those containing Co(OH)2 layers synthesized after 5 SILD cycles. One of the best examples of this series was obtained from 40 SILD cycles and is characterizedby the overpotential value at 29 mV of current density at 10 mA/cm2, the Tafel slope value at 29.5 mV/dec, and high stability of these values at multiple cycle potential. It is noted that the Pt(0) nanoparticles synthesized after 40 SILD cycles are 4–8 nm in size and are located on the surface of the nanoflakes ata distance of about 10 nm from each other for the nickel foam sample, on the surface of which a Co(OH)2 nanolayer was synthesized as a result of 5 SILD cycles. These features contribute to the formation of a set of Pt(0) nanoparticle contact points with the surface of Co(OH)2 nanoflakes, which determines the high electrocatalytic activity and stability of properties of such structures.

KW - platinum nanoparticles

KW - hydrogen evolution reaction

KW - Successive Ionic Layers Deposition

KW - alkaline medium

KW - aqueous solutions

KW - hydrogen evolution reaction

KW - nickel-solution interface

KW - platinum nanoparticles

UR - https://www.mendeley.com/catalogue/a3dfbe50-9f5e-3d40-9a4b-5eba12f6d75b/

U2 - 10.1134/S1023193524030078

DO - 10.1134/S1023193524030078

M3 - Article

VL - 60

SP - 181

EP - 190

JO - Russian Journal of Electrochemistry

JF - Russian Journal of Electrochemistry

SN - 1023-1935

IS - 3

ER -