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Oxidation-Reduction Potential of Iron Encapsulated by Ferritin

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Presentation on theme: "Oxidation-Reduction Potential of Iron Encapsulated by Ferritin"— Presentation transcript:

1 Oxidation-Reduction Potential of Iron Encapsulated by Ferritin
Jacob Embley Dr. John Colton, Dr. Richard Watt, Trevor Smith, Cameron Olsen, Kevin Zenner, and Stephen Erickson Introduce yourself

2 What is ferritin? Spherical protein complex
Nano-cage composed of 24 sub-units Approximately 12 nm in diameter Intracellular complex found in nearly all organisms Organisms use ferritin to store and regulate iron

3 Ferritin further explained
Hollow 8 nm diameter interior Natively encapsulates ferrihydrite nanoparticle Up to 4500 Fe atoms per ferritin Ions enter through 3-fold channels Shorten these bullets

4 Why is ferritin interesting?
Photovoltaic device Nanobattery

5 Batteries Two half-cells Current flows across the potential difference
Reduction and oxidation occur at the electrodes Common issue: Battery performance deteriorates after repeated charge and discharge cycles

6 Potential use of ferritin in a battery
Electrodes composed of Ferritin cores of varying reduction potentials Advantage of this type of battery: Ferritin protects and maintains the metal core

7 Effects of salt anions on reduction potential
Enlarge the graphic

8 Determining the Reduction Potential
Potentiostatic coulometry Cyclic Voltammetry

9 Potentiostatic coulometry
Time Current Try to show some real data

10 Results from potentiostatic coulometry

11 Cyclic voltammetry Cl- Br-

12 Results from cyclic voltammetry

13 Ongoing and Future studies
Testing the battery performance of the ferritin cores: Rate of charge and discharge Life cycle tests Reduction Potential of non-iron metal oxide cores in Ferritin

14 Conclusion The reduction potential of the iron mineral nanoparticle encapsulated by ferritin is significantly altered by the addition of various salt anions Anion Coulometery Reduction CV Reduction (mV) CV Oxidation (mV) Cl- 500.7 ± 8.35 108 ± 52 286 ± 40 Br- 436.3 ± 10.8 -74.0 ± 31 110 ± 26 VO33-  --- 353 ± 74 476 ± 80 PO43- 463.5 ± 12.4 133 ± 35 285 ± 19 MoO42- 445.6 ± 11.8 42.0 ± 52 240 ± 22 WO42-  411.0 ± 12.4 73.0 ± 61 291 ± 31

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