The incorporation of rare earth (RE) elements into high-entropy alloys (HEAs) as electrocatalysts for hydrogen evolution reaction (HER) shows great potential in addressing the energy crisis. Here, we successfully synthesized cerium (Ce)-tailored PdCeMoCuRu HEA with chemical homogeneity and stability using a facile wet-chemical synthesis strategy. The obtained PdCeMoCuRu HEA provides abundant active metal sites, resulting in superior HER performance compared to state-of-the-art Pt/C. It only requires 12.8 mV to achieve a current density of 10 mA cm −2 , which is nearly half that required for Pt/C (24.8 mV). Importantly, it exhibits excellent electrocatalytic durability for 100 hours even under a high current density of 1.0 A cm −2 at the ampere level. Density functional theory (DFT) calculations confirm that the introduction of Ce can modify the electronic configuration and generate synergistic effects around Pd, Cu, and Ru active sites. This work establishes a novel approach for designing efficient RE-tailored HEA electrocatalysts.
Efficient catalytic decomposition of volatile organic compounds (VOCs) in complex coal combustion flue gas remains a significant challenge. In this study, we synthesized a spinel-type high-entropy oxide (HEO) catalyst, (CeMnFeCoCr)3O4, to control the representative VOC o-xylene in the simulated complex coal-fired flue gas. Compared with the conventional multi-phase metal oxide (MMO) catalyst, (CeMnFeCoCr)3O4 demonstrated approximately 20% higher activity, resistance to toxic components (SO2 and H2O), and efficient multi-pollutant removal through reduced competitive effects. The advantages of (CeMnFeCoCr)3O4 arose from its unique composition and the synergistic effects within its high-entropy structure: the integration of Ce oxides—typically found in fluorite structures—into the spinel-type HEO promotes oxygen vacancy formation and promotes deep oxidation of o-xylene. The homogeneous distribution of elements contributes to its resistance against poisoning components. The high-entropy configuration promotes charge redistribution among Ce, Mn, Fe, Co, and Cr, activating inert elements (Co and Cr) to generate more active sites, enabling stable co-adsorption and efficient catalysis of multiple pollutants. This work proved the effectiveness and stability of (CeMnFeCoCr)3O4 in purifying complex coal-fired flue gas, potentially expanding the application of high-entropy materials in industrial settings.
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