Devices and methods for high voltage and solar applications
Provided herein are devices comprising one or more cells, and methods for fabrication thereof. The devices may be electrochemical devices. The devices may include three-dimensional supercapacitors. The devices may be microdevices such as, for example, microsupercapacitors. In some embodiments, the devices are three-dimensional hybrid microsupercapacitors. The devices may be configured for high voltage applications. In some embodiments, the devices are high voltage microsupercapacitors. In certain embodiments, the devices are high voltage asymmetric microsupercapacitors. In some embodiments, the devices are integrated microsupercapacitors for high voltage applications.
1. An electrochemical system comprising:
a planar array of interconnected electrochemical cells;
wherein each electrochemical cell comprises at least two electrodes,
wherein each electrode comprises a charge storing active material comprising a three-dimensional interconnected corrugated carbon-based network (ICCN) comprising a plurality of expanded and interconnected carbon layers and having a plurality of pores, and
wherein at least one electrode further comprises pseudocapacitive nanostructures electrodeposited within at least a portion of the plurality of pores; and
a current collector coupled to the planar array of interconnected electrochemical cells.
2. The electrochemical system of claim 1 , wherein the pseudocapacitive nanostructures comprise MnO 2 , RuO 2 , Co 3 O 4 , NiO, Fe 2 O 3 , CuO, MoO 3 , V 2 O 5 , Ni(OH) 2 , or any combination thereof.
3. The electrochemical system of claim 1 , wherein the planar array of interconnected electrochemical cells is arranged in an interdigitated structure.
4. The electrochemical system of claim 1 , further comprising an electrolyte disposed between the at least two electrodes.
5. The electrochemical system of claim 1 , wherein at least one electrochemical cell is capable of outputting a voltage of at least about 5 volts.
6. The electrochemical system of claim 1 , wherein the electrochemical system is capable of outputting a voltage of at least 100 volts.
7. The electrochemical system of claim 1 , wherein at least one electrochemical cell has an energy density of at least about 22 watt-hours per liter (Wh/L).
8. The electrochemical system of claim 1 , wherein the planar array of interconnected electrochemical cells has a capacitance per footprint of at least about 380 millifarads per square centimeter (mF/cm 2 ).
9. The electrochemical system of claim 1 , wherein the planar array of interconnected electrochemical cells has a volumetric capacitance of at least about 1,100 farads per cubic centimeter (F/cm 3 ).
10. The electrochemical system of claim 1 , comprising one or more positive electrodes having a first mass loading of the pseudocapacitive nanostructures and one or more negative electrodes having a second mass loading of the pseudocapacitive nanostructures, wherein the first mass loading is greater than the second mass loading.
11. The electrochemical system of claim 1 , wherein the pseudocapacitive nanostructures comprise a pseudocapacitive nanoflower, a pseudocapacitive nanoflake, a pseudocapacitive nanorod, a pseudocapacitive nanowire, or any combination thereof.
12. A method for fabricating an electrochemical system, comprising:
forming a carbonaceous film on a current collector;
forming a charge storing active material comprising a three-dimensional interconnected corrugated carbon-based network (ICCN) having a plurality of pores from the carbonaceous film;
patterning the three-dimensional interconnected corrugated carbon-based network (ICCN) to form an array of two or more cells, wherein each cell comprises at least two electrodes; and
electrodepositing pseudocapacitive nanostructures within at least a portion of the plurality of pores.
13. The method of claim 12 , wherein the carbonaceous film comprises graphene oxide (GO).
14. The method of claim 12 , wherein said forming the charge storing active material comprising the three-dimensional interconnected corrugated carbon-based network (ICCN) from the carbonaceous film comprises light scribing.
15. The method of claim 12 , wherein said patterning the three-dimensional interconnected corrugated carbon-based network (ICCN) comprises light scribing.
16. The method of claim 12 , wherein said patterning the three-dimensional interconnected corrugated carbon-based network (ICCN) forms two or more interdigitated electrodes.
17. The method of claim 12 , wherein the array of two or more cells is a planar array.
18. The method of claim 12 , wherein the pseudocapacitive nanostructures comprise MnO 2 , RuO 2 , Co 3 O 4 , NiO, Fe 2 O 3 , CuO, MoO 3 , V 2 O 5 , Ni(OH) 2 , or any combination thereof.
19. The method of claim 12 , further comprising depositing an electrolyte on the three-dimensional interconnected corrugated carbon-based network (ICCN).
20. The method of claim 12 , further comprising connecting two or more cells within the array.