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A cable assembly includes a conductor and a self-cleaning layer that surrounds the conductor and includes one or more of a photocatalyst and an electrocatalyst. Overhead high voltage electricity transmission lines are formed from these cable assemblies. Methods of reducing surface buildup on a cable

A cable assembly includes a conductor and a self-cleaning layer that surrounds the conductor and includes one or more of a photocatalyst and an electrocatalyst. Overhead high voltage electricity transmission lines are formed from these cable assemblies. Methods of reducing surface buildup on a cable are also provided.

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1. A cable assembly, comprising: a conductor;a self-cleaning layer surrounding the conductor, the self-cleaning layer comprising one or more of a photocatalyst and an electrocatalyst; andan intermediate layer surrounding the conductor and disposed between the conductor and the self-cleaning layer, t

1. A cable assembly, comprising: a conductor;a self-cleaning layer surrounding the conductor, the self-cleaning layer comprising one or more of a photocatalyst and an electrocatalyst; andan intermediate layer surrounding the conductor and disposed between the conductor and the self-cleaning layer, the intermediate layer formed from an inorganic, non-photocatalytic material; andwherein the one or more of the photocatalyst and electrocatalyst are in a crystalline state and have an average particle size of 1 nm to 100 nm, and the cable assembly comprises a water contact angle smaller than a cable assembly without the self-cleaning layer when measured in accordance with ASTM D5725-99 (2008) after exposure to ultraviolet light for 60 minutes or more. 2. The cable assembly of claim 1, wherein the one or more of the photocatalyst or the electrocatalyst comprises a semi-conductive material or conductive material. 3. The cable assembly of claim 1, wherein the one or more of the photocatalyst and the electrocatalyst comprises titanium oxide. 4. The cable assembly of claim 3, wherein the titanium oxide is in an anatase crystalline state. 5. The cable assembly of claim 1, wherein the self-cleaning layer further comprises a co-catalyst. 6. The cable assembly of claim 1, wherein the self-cleaning layer has a thickness of 5 microns or less. 7. The cable assembly of claim 1, wherein the one or more of the photocatalyst and the electrocatalyst comprises more than 90%, by dry weight, of the self-cleaning layer. 8. The cable assembly of claim 1, wherein the self-cleaning layer is free of polymer. 9. The cable assembly of claim 1, wherein the water contact angle for the cable assembly is reduced by 7% or more after exposure to the ultraviolet light. 10. The cable assembly of claim 1, wherein the intermediate layer has a thickness of about 20 μm to about 40 μm. 11. The cable assembly of claim 1, wherein the self-cleaning layer conforms to the intermediate layer. 12. The cable assembly of claim 1, wherein the self-cleaning layer is the outermost layer of the cable assembly. 13. An overhead high voltage electricity transmission line formed from the cable assembly of claim 1. 14. The overhead high voltage electricity transmission line of claim 13, wherein the conductor comprises: a core, the core comprising one or more of carbon fiber composite, glass fiber composite, aluminum, and aluminum alloy fibers reinforced in aluminum; andone or more electrically conductive wires, the one or more electrically conductive wires surrounding the core. 15. The cable assembly of claim 1, wherein the conductor comprises a plurality of conductive wires. 16. A cable assembly, comprising: a conductor;a self-cleaning layer surrounding the conductor, the self-cleaning layer comprising a first photocatalyst comprising titanium oxide; andan intermediate layer surrounding the conductor and disposed between the conductor and the self-cleaning layer, the intermediate layer comprising from 10% to 35%, by weight, of one or more of a second photocatalyst and an electrocatalyst;wherein the titanium oxide is in a crystalline state and has an average particle size of 10 nm to 50 nm, and the cable assembly comprises a water contact angle smaller than a cable assembly without the self-cleaning layer when measured in accordance with ASTM D5725-99 (2008) after exposure to ultraviolet light for 60 minutes or more. 17. A cable assembly, comprising: a conductor; anda self-cleaning layer surrounding the conductor as the outermost layer of the cable assembly, the self-cleaning layer comprising one or more of a photocatalyst and an electrocatalyst and being free of polymer; andwherein the one or more of the photocatalyst and electrocatalyst are in a crystalline state and have an average particle size of 1 nm to 100 nm, and the cable assembly comprises a water contact angle smaller than a cable assembly without the self-cleaning layer when measured in accordance with ASTM D5725-99 (2008) after exposure to ultraviolet light for 60 minutes or more.