Search

• Cu 9 S 5 /coal gasification fine slag(CGFS) composites were synthesized via a simple one-step hydrothermal method. • Utilizing collaborative components and interface engineering to address the issue of excessive electrical conductivity in CGFS. • Composites could exhibit excellent EM wave absorption and achieve radar stealth effect. • This work provides a reference for the development of green and sustainable EMW absorbing materials. The optimized design of industrial waste coal gasification fine slag (CGFS) using component synergy and interface engineering to limit the high conductivity problem of CGFS is important for the development of green and sustainable electromagnetic wave (EMW)-absorbing materials. Herein, polyhedral Cu 9 S 5 /CGFS composites were designed using a simple one-step hydrothermal method via compositional synergies and interface engineering. The results show that the composites have multiple polarization behaviors and excellent impedance matching properties and reflection loss capability. A minimum reflection loss of -25.01 dB, an effective absorption bandwidth of 3.52 GHz, and a radar wave attenuation value of 16.2 dBm2 was achieved at a thickness of 1.4 mm, and even at a thickness of 2.1 mm, the minimum reflection loss value was as high as -56.56 dB. This work provides a reference for the development of green EMW-absorbing materials and promotes the recycling of solid waste CGFS. Cu 9 S 5 /coal gasification fine slag(CGFS) composites were synthesized via a hydrothermal synthesis method. The issue of excessive electrical conductivity in CGFS is solved by using collaborative components and interface engineering. The composites can effectively exhibit excellent EM wave absorption and achieve radar stealth effect. The minimum reflection loss is -25.01 dB and the effective absorption bandwidth can reach 3.52 GHz at a thickness of 1.4 mm, and a radar wave attenuation value of 16.2 dBm2 is achieved. Even at a thickness of 2.1 mm, the minimum reflection loss value is as high as -56.56 dB. This work provides a reference for the development of green and sustainable EMW absorbing materials. [Display omitted] [ABSTRACT FROM AUTHOR]