α-Fe 2 O 3 , which has a favorable bandgap (1.9–2.2 eV), has
been intensively investigated in lithium ion batteries (LIB), [ 1,2 ]
fi eld-effect transistors (FETs), [ 3 ] fi eld emitters, [ 4 ] sensors, [ 5 ]
pigments, [ 6 ] and catalysis [ 7 ] due to its chemical stability