Surface photovoltage property of magnesium ferrite/hematite heterostructured hollow nanospheres prepared with one-pot strategy

► MgFe2O4/α-Fe2O3 hollow nanospheres were synthesized via a facile method. ► The formation of heterojunction between the two crystalline phases was revealed by HRTEM. ► The hollow nanospheres present remarkable surface photovoltage in UV-vis spectral region.