Characterization of MXene@PANI heterojunction (A) The scanning electron microscope of MXene, (B) The scanning electron microscope of MXene@PANI, (C) The transmission electron microscope of MXene, (D) The transmission electron microscope of MXene@PANI, (E–I) The EDS-mapping of MXene@PANI, (J) Section element content of MXene@PANI. Scale bar = 200 nm.