Recent advances of high-entropy alloys in CO2 catalytic conversion

High-entropy alloys (HEAs) have broad application prospects in CO 2 catalytic conversion due to their high configurational entropy, lattice distortion effect and the synergistic effect of multiple elements. In this paper, we systematically review the design strategies and synthesis methods of HEAs and their application progress in CO 2 catalytic conversion. It is shown that HEAs can significantly enhance the CO 2 adsorption activation and reaction selectivity by forming diverse active sites. Taking thermal catalysis as an example, TiO 2 -loaded CoNiCuRuPd HEAs nanoparticles achieved 68.3% CH 4 selectivity at 673 K, while non-precious metal-based HEAs such as FeCoNiCuMn have both high activity and low-cost advantages. In terms of synthesis techniques, carbon thermal shock, solvothermal, and microwave-assisted synthesis can precisely regulate the nanostructures and compositional homogeneity of HEAs, among which the CoMoFeNiCu HEAs nanoparticles synthesized by carbon thermal shock achieved 50% CO 2 conversion and 99% CO selectivity in the inverse water-gas shift reaction. Through surface defect engineering and machine learning-assisted design, the catalytic performance of the HEAs can be further optimized. However, HEAs still face challenges in high temperature sintering resistance, reaction pathway control, and scale-up preparation. In the future, we need to combine in-situ characterization technology and multi-scale computational models to deeply analyze the correlation mechanism of the “composition-structure-property”. This will promote the application of HEAs in the field of CO 2 catalysis and provide key materials to support the utilization of CO 2 and the goal of “carbon neutrality”.