The effective separation and efficient transportation of photogenerated carriers within a photoanode are critical factors for achieving outstanding photoelectrochemical (PEC) water splitting. In this study, TiO₂-ferrihydrite (Fh)-MXene nanowire arrays (NWAs) are fabricated by a hydrothermal method followed by spin coating. TiO₂-Fh-MXene NWAs achieved a photocurrent density of 1.44 mA/cm² at 1.23 V versus the reversible hydrogen electrode (vs RHE), surpassing TiO₂-Fh by 2.05 times and TiO₂ by 2.93 times. According to the electrochemical impedance spectroscopy, photoluminescence, and Mott-Schottky measurements, the significant enhancement in the separation of photogenerated electron-hole pairs and efficient carrier transportation are ascribed to the integration of Fh and MXene, respectively. Additionally, the light absorption of TiO₂ NWAs is improved with the incorporation of the Fh-MXene layer. This work provides valuable insights into the fabrication of photoanodes, especially using wide bandgap materials.