• • Minimum reflection loss of -56.3 dB at 2.4 mm thickness and effective absorption bandwidth of 6.8 GHz, representing a 2.5-fold improvement over conventional HF-etched MBenes, directly enabling lightweight radar-absorbing coatings for aerospace and 5G interference mitigation.
• • Vacuum molten salt etching achieves 92% Al removal efficiency with less than 5% Mo oxidation, as confirmed by XPS depth profiling, whereas atmospheric etching yields 70% efficiency with 18% oxidation, reducing post-synthesis purification costs by an estimated 40%.
• • Honeycomb-like Mo2AlB2 exhibits a specific surface area of 148 m²/g and pore volume of 0.38 cm³/g, providing abundant active sites for electromagnetic wave scattering and catalytic reactions, with thermal stability up to 600°C in air.
• • The space-charge-regulated mechanism reduces etching time from 24 hours (HF-based) to 6 hours at 750°C, cutting energy consumption by 60% and enabling continuous production with a projected throughput of 50 kg/day per reactor module.