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Unveiling the Hydrogen Evolution Catalytic Performance of V2AlC MAX Phase
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DOI：10.1002/ente.70560.png)
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Abstract
En 中文
The development of efficient, durable, and earth-abundant electrocatalysts is critical for advancing sustainable hydrogen production through electrochemical water splitting. Herein, we report the synthesis of phase-pure V2AlC MAX phase via vacuum-assisted solid-state reaction using elemental vanadium, aluminum, and carbon precursors, and systematically evaluate its intrinsic bifunctional electrocatalytic activity toward hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Structural and morphological characterizations confirm the successful formation of a well-defined layered MAX-phase architecture, which promotes efficient charge transport and exposes accessible catalytic sites. X-ray photoelectron spectroscopy (XPS) further verifies the characteristic VC and AlC bonding environments, confirming the formation of the V2AlC structure. Electrochemical measurements reveal that pristine V2AlC delivers an overpotential of 185 mV for HER and 390 mV for OER at 10 mA cm−2, accompanied by Tafel slopes of 93 and 121.8 mV dec−1, respectively. Furthermore, the catalyst achieves an overall water-splitting voltage of 1.7 V with excellent operational stability during prolonged electrolysis. Notably, these results demonstrate that unmodified V2AlC MAX phase can function as an efficient bifunctional electrocatalyst, highlighting the intrinsic catalytic potential of MAX-phase materials and offering a promising pathway toward cost-effective and scalable catalysts for sustainable hydrogen production.
Keywords:
electrocatalysis
hydrogen evolution reaction
oxygen evolution reaction
V2AlC MAX phase
water splitting
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