Preparation and Oxygen Reduction Performance of Core-shell High Index Pt3-xCo@Ptx/C nanocatalysts

doi:10.15541/jim20260173

Abstract

Abstract: Hydrogen fuel cells have become a research hotspot in the field of new-energy electrochemistry owing to their prominent technical merits, including high energy-conversion efficiency, zero environmental pollution and favorable environmental compatibility. At present, commercial catalysts commonly suffer from high noble-metal loading, sluggish catalytic reaction kinetics, and insufficient catalytic efficiency. In this study, high-index Pt-Co alloy seeds were synthesized via the hydrothermal method. Subsequently, the core-shell structure was precisely fabricated through the epitaxial reductive growth of the Pt shell, and a series of high-index core-shell nanocatalysts of Pt_3-_xCo@Pt_x/C(x=0.3, 0.6, 0.9) were obtained. Results demonstrate that the as-prepared catalysts display high-index concave morphology, and the surface of Pt_2.4Co@Pt_0.6/C mainly exposes {310} and {410} high-index facets. ORR measurements reveal that its electrochemical active surface area (ECSA) reaches 63.05 m²·g^-1, which is 1.9 times that of the commercial Pt/C catalyst. The mass activity (MA) is 299 mA·mg_Pt^-1, 2.3-fold higher than that of commercial Pt/C. After 5000 potential cycles, its half-wave potential only decays by 15 mV, demonstrating outstanding ORR catalytic activity and stability. This is attributed to the unique core-shell structure that couples the strain effect and electronic modulation effect, which precisely tunes the d-band center of Pt and optimizes the adsorption-desorption behavior of ORR intermediates. By investigating the catalytic synergistic mechanism of the high-index core-shell structure, this work provides a theoretical basis and technical support for the controllable fabrication of high-performance ORR catalysts applied to hydrogen fuel cells.

Key words: hydrogen cell, oxygen reduction reaction, core-shell structure, high-index facet

CLC Number:

TQ116

WANG Xuan, GUO Ruihua, AN Shengli, SUN Tingting, LIU Yuanyuan, YUE Shuaijun. Preparation and Oxygen Reduction Performance of Core-shell High Index Pt_3-_xCo@Pt_x/C nanocatalysts[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20260173.

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Preparation and Oxygen Reduction Performance of Core-shell High Index Pt_3-_xCo@Pt_x/C nanocatalysts

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