A Protein-Based Ferritin Bio-Nanobattery

Table 1

Electrochemical properties of ferritins with different core minerals.

Reaction	Ferritin Core	mV	pH
Fe(OH)3 + e = Fe(OH)2 + OH^−	Native HoSF^a	−190 to −420	7.0–9.0
Co(OH)3 + e = Co(OH)2 + OH^−	Synthetic HoSF^b	+50	7.0
Mn(OH)3 + e = Mn(OH)2 + OH^−	Synthetic HoSF^b	+35	7.0
Fe(OH)2(PO4) + e = Fe(OH)(PO4) + OH^−	Native bacterial^c ferritin	−430	7.0–9.0
Fe(OH)2(PO4) + e = Fe(OH)(PO4) + OH^−	Synthetic HoSF	−300	7.0
Ni(OH)3 + e = Ni(OH)2 + OH^−	Synthetic HoSF	−1000	7.0

^a: [20]; ^b: [22]; ^c: [24].