Wearable triboelectric generator for energy harvesting

A method for forming a wearable water triboelectric generator, the method comprising:

• providing a substrate, wherein the substrate comprises a first surface and a second surface, wherein the first surface and the second surface are opposing to each other;
• coating a suspension comprising hydrophobic cellulose oleoyl ester nanoparticles onto the first surface of the substrate, thereby forming a coating of hydrophobic cellulose oleoyl ester nanoparticles on the first surface of the substrate;
• drying the substrate;
• and
• coating an electrode on the second surface of the substrate,
• wherein the substrate comprises openings and remains breathable.

A wearable dual mode water and contact triboelectric generator comprising:

• a water triboelectric generator, wherein the water triboelectric generator comprises a first substrate having a first surface and a second surface, wherein the first surface and the second surface are opposing to each other;
• and wherein the first surface comprises a modified hydrophobic surface comprising a coating of hydrophobic cellulose oleoyl ester nanoparticles;
• and
• a contact triboelectric generator, wherein the contact triboelectric generator comprises a second substrate having a third surface and a fourth surface, wherein the third surface and the fourth surface are opposing to each other,
• the contact triboelectric generator further comprises a third substrate having a fifth surface and a sixth surface, wherein the fifth surface and the sixth surface are opposing to each other,
• the contact triboelectric generator further comprises a spacer positioned between the second substrate and the third substrate such that the spacer is close to or in contact with the fourth surface of the second substrate and the fifth surface of the third substrate,
• the contact triboelectric generator further comprises a first electrode coated on the third surface of the second substrate, and further comprises a second electrode coated on the sixth surface of the third substrate, such that the first electrode and the second electrode are opposing,
• wherein the water triboelectric generator and the contact triboelectric generator are arranged such that the first substrate of the water triboelectric generator completely surrounds or encapsulates the contact triboelectric generator, and
• wherein the second surface of the first substrate contacts the first electrode and the second electrode of the contact triboelectric generator.