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Hybrid electrochemical capacitors, electronic devices using such capacitors, and associated methods are disclosed. In an example, a hybrid electrochemical capacitor can include a first electrode made from Mg, Na, Zn, Al, Sn, or Li, a second electrode made from a porous material such as porous carbon

Hybrid electrochemical capacitors, electronic devices using such capacitors, and associated methods are disclosed. In an example, a hybrid electrochemical capacitor can include a first electrode made from Mg, Na, Zn, Al, Sn, or Li, a second electrode made from a porous material such as porous carbon or passivated porous silicon, and an electrolyte. The hybrid electrochemical capacitors can have enhanced voltage and energy density compared to other electrochemical capacitors, and enhanced power density compared to batteries.

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1. A hybrid electrochemical capacitor comprising: a first electrode;a second electrode; anda first electrolyte comprising a non-aqueous electrolyte;a second electrolyte comprising an aqueous electrolyte;wherein: the first electrode comprises Mg, Na, Zn, Al, Sn, TiO2 or combinations thereof; andthe s

1. A hybrid electrochemical capacitor comprising: a first electrode;a second electrode; anda first electrolyte comprising a non-aqueous electrolyte;a second electrolyte comprising an aqueous electrolyte;wherein: the first electrode comprises Mg, Na, Zn, Al, Sn, TiO2 or combinations thereof; andthe second electrode comprises a porous material having a surface-area-to-volume ratio of at least 10 m2/cm3. 2. The hybrid electrochemical capacitor of claim 1, wherein the second electrode comprises a porous material having a surface-area-to-volume ratio from about 10 m2/cm3 to about 5000 m2/cm3. 3. The hybrid electrochemical capacitor of claim 1, wherein the second electrode comprises porous carbon. 4. The hybrid electrochemical capacitor of claim 3, wherein the second electrode comprises a binder and a conducting agent. 5. The hybrid electrochemical capacitor of claim 3, wherein the second electrode is a substantially solid material. 6. The hybrid electrochemical capacitor of claim 1, wherein the second electrode comprises a particulate material. 7. The hybrid electrochemical capacitor of claim 6, wherein the particulate material is in a binder. 8. The hybrid electrochemical capacitor of claim 1, wherein the second electrode comprises porous silicon, porous germanium, porous group III-V semiconductor, porous group IV semiconductor, graphene, a carbon nanowire, a carbon nanotube, or combinations thereof. 9. The hybrid electrochemical capacitor of claim 1, wherein the second electrode comprises a pseudocapacitive material. 10. The hybrid electrochemical capacitor of claim 1, wherein the first electrode comprises magnesium and the first electrolyte comprises Mg ions. 11. The hybrid electrochemical capacitor of claim 1, further comprising a separator. 12. The hybrid electrochemical capacitor of claim 1, wherein at least one of the first electrolyte and the second electrolyte is a solid state electrolyte that acts as a separator. 13. A hybrid electrochemical capacitor comprising: a first electrode;a second electrode; anda first electrolyte comprising a non-aqueous electrolyte;a second electrolyte comprising an aqueous electrolyte;wherein: the first electrode comprises Mg, Na, Zn, Al, Sn, TiO2, pre-lithiated carbon, Li, or combinations thereof; andthe second electrode comprises a porous structure formed out of a group IV semiconductor, a group III-V semiconductor, or combinations thereof. 14. The hybrid electrochemical capacitor of claim 13, wherein the second electrode comprises porous silicon. 15. The hybrid electrochemical capacitor of claim 14, wherein the porous silicon is coated with a coating material with a thickness less than 100 nm. 16. The hybrid electrochemical capacitor of claim 15, wherein the coating material is electrically conductive. 17. The hybrid electrochemical capacitor of claim 15, wherein the coating material comprises carbon, nitride, silicide, carbide, or combinations thereof. 18. The hybrid electrochemical capacitor of claim 15, wherein the coating material comprises titanium nitride. 19. The hybrid electrochemical capacitor of claim 15, wherein the coating material passivates surfaces of the porous silicon. 20. The hybrid electrochemical capacitor of claim 15, wherein the coating material is pseudocapacitive. 21. A mobile electronic device comprising: a housing;a processing unit; andan energy storage device, the energy storage device comprising a hybrid electrochemical capacitor, wherein the hybrid electrochemical capacitor comprises:a first electrode;a second electrode;a first electrolyte comprising a non-aqueous electrolyte; anda second electrolyte comprising an aqueous electrolyte;wherein either: (1) the first electrode comprises Mg, Na, Zn, Al, Sn, or combinations thereof, and the second electrode comprises a porous material having a surface-area-to-volume ratio of at least 10 m2/cm3; or(2) the first electrode comprises Mg, Na, Zn, Al, Sn, pre-lithiated carbon, Li, or combinations thereof, and the second electrode comprises porous silicon. 22. The mobile electronic device of claim 21, wherein at least one of the first electrode and the second electrode comprises porous silicon, porous carbon, graphene, a carbon nanowire, a carbon nanotube, porous Germanium, porous group III-V semiconductor, porous group IV semiconductor, a pseudocapacitive material, or combinations thereof. 23. The mobile electronic device of claim 21, wherein: the first electrode is at least partially immersed in the first electrolyte and the second electrode is at least partially immersed in the second electrolyte. 24. The mobile electronic device of claim 21, wherein the first electrolyte comprises a gel electrolyte, a solid-state electrolyte, a non-aqueous electrolyte, or combinations thereof. 25. The mobile electronic device of claim 21, wherein the first electrolyte is a water-stable electrolyte. 26. The mobile electronic device of claim 21, further comprising a separator. 27. The mobile electronic device of claim 26, wherein the first electrolyte is an organic electrolyte and the separator comprises a porous ceramic, a polymer film, or combinations thereof.