The paper presents a novel design for a wettability-gradient-induced-diode (WGID) membrane, which is an electrospun nanofiber membrane engineered with MXene. This membrane exhibits enhanced thermal emissivity and conductance, as well as unidirectional water transport, making it suitable for passive-evaporative cooling. The WGID membrane consists of a tri-layer structure: a PVDF&PU hydrophobic layer, a PU@MXene (10%) transport layer, and a PU@MXene (20%) hydrophilic layer. The wettability gradient is achieved by tailoring the water contact angle of each layer, allowing for efficient heat dissipation and moisture transport. The membrane demonstrates a cooling temperature of 1.5 °C in the "dry" state and 7.1 °C in the "wet" state, with a high emissivity of 96.40% in the MIR range and a superior thermal conductivity of 0.3349 W m⁻¹ K⁻¹. The WGID membrane also shows zero-energy-consumption for personal cooling management through multiple heat dissipation pathways, including thermal radiation, conduction, and evaporation. The study highlights the potential of this design for developing more efficient and comfortable thermoregulatory textiles in high-humidity environments.The paper presents a novel design for a wettability-gradient-induced-diode (WGID) membrane, which is an electrospun nanofiber membrane engineered with MXene. This membrane exhibits enhanced thermal emissivity and conductance, as well as unidirectional water transport, making it suitable for passive-evaporative cooling. The WGID membrane consists of a tri-layer structure: a PVDF&PU hydrophobic layer, a PU@MXene (10%) transport layer, and a PU@MXene (20%) hydrophilic layer. The wettability gradient is achieved by tailoring the water contact angle of each layer, allowing for efficient heat dissipation and moisture transport. The membrane demonstrates a cooling temperature of 1.5 °C in the "dry" state and 7.1 °C in the "wet" state, with a high emissivity of 96.40% in the MIR range and a superior thermal conductivity of 0.3349 W m⁻¹ K⁻¹. The WGID membrane also shows zero-energy-consumption for personal cooling management through multiple heat dissipation pathways, including thermal radiation, conduction, and evaporation. The study highlights the potential of this design for developing more efficient and comfortable thermoregulatory textiles in high-humidity environments.