Material and device properties modification by electrochemical charge injection in the absence of contacting electrolyte for either local spatial or final states
View Patent ↗In some embodiments, the present invention is directed to processes for the combination of injecting charge in a material electrochemically via non-faradaic (double-layer) charging, and retaining this charge and associated desirable properties changes when the electrolyte is removed. The present invention is also directed to compositions and applications using material property changes that are induced electrochemically by double-layer charging and retained during subsequent electrolyte removal. In some embodiments, the present invention provides reversible processes for electrochemically injecting charge into material that is not in direct contact with an electrolyte. Additionally, in some embodiments, the present invention is directed to devices and other material applications that use properties changes resulting from reversible electrochemical charge injection in the absence of an electrolyte.
1. A process to provide, retain and employ electronic charge injection to substantially change the properties of an article, the process comprising the steps of:
(a) providing an article A, wherein the article A is selected from the group consisting of a largely electrolyte-free porous electrode region, at least one particle, and combinations thereof;
(b) immersing article A into an electrolyte E;
(c) providing an ion conducting and substantially electronically insulating continuous path between article A and a counter-electrode B;
(d) applying a potential between article A and the counter electrode B for sufficient time that substantial electronic charge is predominately non-faradaically injected into article A to form a charge-injected article A; and
(e) substantially removing the electrolyte E from contact with charge-injected article A; wherein
(i) both the article A and the counter electrode B have an electronically conducting state selected from the group consisting of charged, uncharged, and combinations thereof,
(ii) the article A has an achievable capacitance for non-faradaic charging of at least about 0.1 F/g, and
(iii) the article A comprises a substance selected from the group consisting of nanofibers, an aggregate of electronically conducting particles, a direct-lattice photonic crystal that is electronically conducting, an inverse-lattice photonic crystal that is electronically conducting, and combinations thereof.
2. The process of claim 1 , wherein the article A comprises nanotubes.
3. The process of claim 2 , wherein said nanotubes are overcoated with a second material having an electrical property selected from the group consisting of insulating, semiconducting, conducting, and combinations thereof.
4. The process of claim 2 , wherein said nanotubes are at least partially filled with a material selected from the group consisting of a metal, a semiconductor, an insulator, and combinations thereof.
5. The process of claim 2 , wherein said nanotubes are configured as a porous sheet or a porous fiber.
6. The process of claim 2 , wherein said nanotubes comprise carbon nanotubes.