Gallium-doped MXene/cellulose nanofiber composite membranes with electro/photo thermal conversion property for high performance electromagnetic interference shielding

•The CMG composite membranes could achieve a tensile strength of 36.12 MPa with good flexibility.•The CMG composite membranes could achieve a maximum thermal conductivity of approximately 9.11 W/m·K.•The maximum SSE/t value of CMG composite membranes was 6444.1 dB·cm2·g−1.•The CMG composite membranes showed excellent electrothermal conversion behavior and photothermal effects.