TY - JOUR

T1 - Sulfonated Polycatechol Immobilized in a Conductive Polymer for Enhanced Energy Storage

AU - Lukyanov, Daniil A.

AU - Vereshchagin, Anatoliy A.

AU - Soloviova, Anastasiya V.

AU - Grigorova, Olga V.

AU - Vlasov, Petr S.

AU - Levin, Oleg V.

N1 - Publisher Copyright: © 2021 American Chemical Society. Copyright: Copyright 2021 Elsevier B.V., All rights reserved. Publisher Copyright: ©

PY - 2021/5/24

Y1 - 2021/5/24

N2 - Catechols are of great interest as cathode materials for energy storage due to the combination of high capacity and redox potential. However, pristine catechols possess poor electrical conductivity and dissolution stability. We propose a sulfonated polycatechol SPVQ with a high molecular mass, which can be used as an anionic redox-active dopant for the electrochemical deposition of poly(3,4-ethylenedioxythiophene) (PEDOT). Proposed polycatechol is designed to maximize the theoretical capacity as much as possible for the polymer bearing both catechol and sulfonate functionalities. The composite polymer shows an improved capacity due to the two-electron faradaic process of SPVQ compared to PEDOT:PSS (49 mA h g-1 vs 21 mA h g-1) and, being deposited on a carbon fiber, affords an areal capacitance of 264 mF cm-2 versus 87 mF cm-2 for PEDOT:PSS. Coulombic anchoring of SPVQ in the PEDOT matrix resulted in increased cycling stability of the material (70% capacity retention after 100 cycles and 35% after 1500 cycles). Scanning electron microscopy, operando spectroelectrochemical, and microgravimetric methods reveal a great impact of the polyanionic dopant structure on the morphology, ionic transport, and finally electrochemical performance of the composite material. The obtained results demonstrate the importance of fine tuning of the composition and morphology of the composite materials to ensure optimal interactions between the redox/anionic and conductive components.

AB - Catechols are of great interest as cathode materials for energy storage due to the combination of high capacity and redox potential. However, pristine catechols possess poor electrical conductivity and dissolution stability. We propose a sulfonated polycatechol SPVQ with a high molecular mass, which can be used as an anionic redox-active dopant for the electrochemical deposition of poly(3,4-ethylenedioxythiophene) (PEDOT). Proposed polycatechol is designed to maximize the theoretical capacity as much as possible for the polymer bearing both catechol and sulfonate functionalities. The composite polymer shows an improved capacity due to the two-electron faradaic process of SPVQ compared to PEDOT:PSS (49 mA h g-1 vs 21 mA h g-1) and, being deposited on a carbon fiber, affords an areal capacitance of 264 mF cm-2 versus 87 mF cm-2 for PEDOT:PSS. Coulombic anchoring of SPVQ in the PEDOT matrix resulted in increased cycling stability of the material (70% capacity retention after 100 cycles and 35% after 1500 cycles). Scanning electron microscopy, operando spectroelectrochemical, and microgravimetric methods reveal a great impact of the polyanionic dopant structure on the morphology, ionic transport, and finally electrochemical performance of the composite material. The obtained results demonstrate the importance of fine tuning of the composition and morphology of the composite materials to ensure optimal interactions between the redox/anionic and conductive components.

KW - catechol

KW - conductive polymer

KW - PEDOT

KW - polythiophene

KW - quinone

KW - rechargeable batteries

KW - redox polymer

KW - FILM

KW - REDOX PROCESSES

KW - LITHIUM-ION

KW - CATHODE

KW - ELECTRODE

KW - POLYDOPAMINE

UR - http://www.scopus.com/inward/record.url?scp=85106459353&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/f56367b6-8630-3993-b043-19eadb74d8cc/

U2 - 10.1021/acsaem.1c00639

DO - 10.1021/acsaem.1c00639

M3 - Article

AN - SCOPUS:85106459353

VL - 4

SP - 5070

EP - 5078

JO - ACS Applied Energy Materials

JF - ACS Applied Energy Materials

SN - 2574-0962

IS - 5

ER -