Integrated manufacturing of REciclable multi-material COmposites for the TRANSport sector

Abstract

Flexible conductive electrodes are of enormous significance to the emergence of wearable electronics and the continued growth of modern devices. In this work, we developed versatile electrodes comprising intriguing features of efficient electrochemical energy storage and conversion capabilities. Capacitive active films comprised of reduced graphene oxide conjugated V2O5 nanoribbons coated with poly (3,4-ethylene dioxythiophene), PEDOT conducting polymer, forming ternary composites, i.e., V2O5/PEDOT/rGO on silver nanowires coated transparent substrates as solid-state pseudocapacitors. As constructed symmetric solid-state pseudocapacitor electrodes delivered broad potential window???1.4 V under different electrolyte environments (aqueous LiCl and organic LiCl/PVA gel), achieved higher areal capacitance?~?0.6–1.2 mF cm?2 in 0.5 M LiCl organic electrolyte attributed to improved electrode–electrolyte ion interaction and demonstrated higher power and energy density (0.27 ?Wh cm?2) outperforming previously reported devices. Moreover, kinetic blocking from PEDOT and anchoring capability of rGO nanosheet prevented amphoteric vanadium ions from being dissolved from layered V2O5 nanoribbons contributing unusual stability. Scanning electrochemical microscopy (SECM) provided further insights into electrode kinetics at local level, while quantifying electron (or ion transportation) rate and imaging electroactive site distribution. The decisive differences in electrochemical processes occurring in two different electrolytes are discussed in terms of solvation dynamics of Li-ion containing aqueous and polymer gel electrolytes inducing steric hinderance and corresponded with coupled ion–electron conduction/transport due to effective density of states and wavefunction overlap.

» Publication Date: 05/07/2023

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