Robust Multisource Built-In Electric Fields in High-Entropy MXene-Derived Nitrides for Efficient Electromagnetic Wave Absorptions

achieved a minimum reflection loss of -52.02 dB and an effective absorption bandwidth of 4.8 GHz at a thickness of only 2.0 mm. This work not only sheds light on the origin and regulation of BIEF for enhanced electromagnetic absorption but also provides an effective strategy to construct multisource BIEF for the design of electronic, optoelectronic, and sensing devices.