New PEDOT derivatives electrocoated on szilicon nanowires protected with ALD nanometric alumina for ultrastable microsupercapacitors

Marc Dietrich (1, 2) , Loïc Paillardet (2) , Anthony Valero (1, 2) , Mathieu Deschanels (2) , Philippe Azaïs (3) , Pascal Gentile (1) , Saïd Sadki (2)

1 SiNaps - Silicon Nanoelectronics Photonics and Structures
2 SYMMES - SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé
3 DEHT - Département de l'électricité et de l'hydrogène dans les transports

This work deals with electroactive conducting polymers (ECPs) used as a complementary component on purely capacitive silicon nanowires protected by a 3 nm alumina layer. Accordingly, in this work, we use a fast and simple deposition method to create a pseudocapacitive material based on the electropolymerization in aqueous micellar media (SDS and SDBS 0.01 M) of hydroxymethyl-EDOT (EDOT-OH) onto 3 nm alumina-coated silicon nanowires (Al3@SiNWs). The composite material displays remarkable capacitive behavior with a specific capacitance of 4.75 mF·cm$^{−2}$ at a current density of 19 µA·cm$^{−2}$ in aqueous Na$_2$SO$_4$ electrolyte

Keywords: pseudo-supercapacitors; electroactive conducting polymers; SiNWS; ALD; SDS and SDBS surfactants; PEDOT derivaties

Domains: Physics [physics]; Chemical Sciences

Marc Dietrich, Loïc Paillardet, Anthony Valero, Mathieu Deschanels, Philippe Azaïs, et al.. New PEDOT derivatives electrocoated on szilicon nanowires protected with ALD nanometric alumina for ultrastable microsupercapacitors. Materials, 2022, 15 (17), pp.5997. ⟨10.3390/ma15175997⟩. ⟨cea-03940248⟩