Demonstrates enhanced hydrogen evolution performance in intermetallics, suggesting a novel synthesis method.
Pt-based intermetallics are high-efficiency electrocatalysts for the hydrogen evolution reaction (HER) in proton exchange membrane water electrolysis (PEMWE). However, the synthesis of intermetallics usually relies on high-temperature annealing, which easily induces particle agglomeration and limits the improvement of catalytic performance. In this study, a synergistic strategy of spatial confinement and ordered structure regulation is adopted, and indene-derived mesoporous carbon (IMC) is used as the support to controllably synthesize the intermetallic Pt3Fe catalyst. The IMC support can anchor and spatially confine nanoparticles, thereby preventing particle sintering and agglomeration during high-temperature annealing. In 0.5 mol·L−1 H2SO4 electrolytes, the catalyst exhibits excellent catalytic performance: it achieves an overpotential of only 19.1 mV at a current density of 10 mA·cm−2, which is 9.4 mV lower than that of commercial Pt/C; its mass activity reaches 2.76 A·mgPt−1, 8 times that of commercial Pt/C. Chronopotentiometry measurements show negligible potential variation after 190 h of operation at 10 mA·cm−2. This strategy suppresses particle agglomeration through the spatial confinement effect of IMC and modulates electronic states via the ordered structure, providing a practical route for the scalable preparation of low-cost, highly active and high-stability Pt-based intermetallics for PEMWE applications.
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Sheng et al. (2026) studied this question.
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