Energy harvesting devices and methods of making and use thereof

1. An energy harvesting device comprising:

a first electrode comprising a first material;

a second electrode comprising the first material;

wherein the first material comprises a plurality of particles and a plurality of ions;

wherein the plurality of ions are intercalated within the plurality of particles; and

wherein the plurality of ions comprise a plurality of alkali metal ions;

a porous separator disposed between the first electrode and the second electrode such that the porous separator is in contact with the first electrode and the second electrode, wherein the porous separator further comprises an electrolyte; and

wherein the energy harvesting device is configured to convert a mechanical strain to an electrical current, thereby harvesting energy.

2. The energy harvesting device of claim 1 , wherein the plurality of particles have an average lateral dimension of from 10 nanometers (nm) to 10 micrometers (microns, μm).

3. The energy harvesting device of claim 1 , wherein the plurality of particles have an average thickness of from 1 atomic layer to 50 atomic layers.

4. The energy harvesting device of claim 1 , wherein the plurality of particles comprise graphite, graphene, aluminum, a metal dichalcogenide, a metal oxide, an allotrope of phosphorous, or a combination thereof.

5. The energy harvesting device of claim 1 , wherein the loading of the first material on the first electrode and/or the second electrode is from 0.1 mg/cm 2 to 10 mg/cm 2 .

6. The energy harvesting device of claim 1 , wherein the mechanical strain comprises pressing and/or bending the energy harvesting device.

7. The energy harvesting device of claim 1 , wherein the mechanical strain is generated at a frequency of 5 Hz or less.

8. The energy harvesting device of claim 1 , wherein the mechanical strain is generated by motion of a subject.

9. The energy harvesting device of claim 1 , wherein the mechanical strain is generated by human gait.

10. The energy harvesting device of claim 1 , wherein the energy harvesting device has a peak power of 1 nW/cm 2 or more.

11. The energy harvesting device of claim 1 , wherein the energy harvesting device harvests an energy of 0.1 μJ/cm 2 or more.

12. The energy harvesting device of claim 1 , wherein the energy harvesting device harvests energy with an efficiency of 20% or more.

13. The energy harvesting device of claim 1 , wherein the energy harvesting device further comprises a packaging material substantially encapsulating the device.

14. The energy harvesting device of claim 1 , wherein the energy harvesting device is dissolvable.

15. A method of harvesting energy using the energy harvesting device of claim 1 , the method comprising applying a mechanical strain to the energy harvesting device, thereby converting the mechanical strain to an electrical current and harvesting the energy.

16. A method of making the energy harvesting device of claim 1 , the method comprising:

dispersing the first material in a solution, thereby forming a mixture;

depositing the mixture on a conducting layer, thereby forming the first electrode;

repeating the dispersing and depositing steps to form the second electrode or cutting the first electrode into two pieces thereby forming the first electrode and the second electrode; and

sandwiching the porous separator between the first electrode and the second electrode, thereby forming the energy harvesting device.

17. A fabric or textile comprising the energy harvesting device of claim 1 .

18. A wearable energy harvesting device comprising a fabric or textile impregnated with the energy harvesting device of claim 1 .