Magnetic field assisted chemical vapour deposition (mf-CVD) has gained more and more interest in the recent years, mainly used for anisotropic control over the nanostructure. By using an external magnetic field (B = 1.0 T) iron pentacarbonyl (Fe(CO)₅) can function as precursor for depositing anisotropic iron crystallites, which could further be transformed into anisotropic hematite (α-Fe₂O₃) nanorods by aerobic oxidation. Magnetic field assisted CVD can be determined as substrate independent, as the demonstration of the deposition of α-Fe₂O₃ films on FTO (F:SnO₂) and Si (100) is constituted by isotropic grains for the absence of the magnetic field, whereas an isotropic growth can be seen by using an external magnetic field. The impact of the magnetic field gets revealed with the transmission electron microscope (TEM), where an gradual increase in average crystallite size in correlation to the increasing field strength and orientation can be seen. Therefore, the magnetic field assisted chemical vapour deposition delivers excellent potential in controlling the texture of the thin films. Given the facet-dependent activity of hematite in forming surface-oxygenated intermediates, exposure of crystalline facets and planes with high atomic density and electron mobilities is crucial for oxygen evolution reactions. The resulting textured hematite pillars from the anisotropy driven iron nanocolumns are showing two-fold higher photoelectrochemical efficiency. Therefore, the isotropic and field absence grown film result in J= 0.027mA/cm², where the anisotropic field assisted grown film shows a value of J= 0.050mA/cm². The dark current measurements of the films indicated faster surface kinetics as the orign of the catalytic activity.