Functionalized Metallic 2D Transition Metal Dichalcogenide-Based Solid-State Electrolyte for Flexible All-Solid-State Supercapacitors.

Content Provider	Europe PMC
Author	Bagheri, Ahmad Bellani, Sebastiano Beydaghi, Hossein Eredia, Matilde Najafi, Leyla Bianca, Gabriele Zappia, Marilena Isabella Safarpour, Milad Najafi, Maedeh Mantero, Elisa Sofer, Zdenek Hou, Guorong Pellegrini, Vittorio Feng, Xinliang Bonaccorso, Francesco
Copyright Year	2022
Abstract	Highly efficientand durable flexible solid-state supercapacitors(FSSSCs) are emerging as low-cost devices for portable and wearableelectronics due to the elimination of leakage of toxic/corrosive liquidelectrolytes and their capability to withstand elevated mechanicalstresses. Nevertheless, the spread of FSSSCs requires the developmentof durable and highly conductive solid-state electrolytes, whose electrochemicalcharacteristics must be competitive with those of traditional liquidelectrolytes. Here, we propose an innovative composite solid-stateelectrolyte prepared by incorporating metallic two-dimensional group-5transition metal dichalcogenides, namely, liquid-phase exfoliatedfunctionalized niobium disulfide (f-NbS2) nanoflakes, intoa sulfonated poly(ether ether ketone) (SPEEK) polymeric matrix. Theterminal sulfonate groups in f-NbS2 nanoflakes interactwith the sulfonic acid groups of SPEEK by forming a robust hydrogenbonding network. Consequently, the composite solid-state electrolyteis mechanically/dimensionally stable even at a degree of sulfonationof SPEEK as high as 70.2%. At this degree of sulfonation, the mechanicalstrength is 38.3 MPa, and thanks to an efficient proton transportthrough the Grotthuss mechanism, the proton conductivity is as highas 94.4 mS cm–1 at room temperature. To elucidatethe importance of the interaction between the electrode materials(including active materials and binders) and the solid-state electrolyte,solid-state supercapacitors were produced using SPEEK and poly(vinylidenefluoride) as proton conducting and nonconducting binders, respectively.The use of our solid-state electrolyte in combination with proton-conductingSPEEK binder and carbonaceous electrode materials (mixture of activatedcarbon, single/few-layer graphene, and carbon black) results in asolid-state supercapacitor with a specific capacitance of 116 F g–1 at 0.02 A g–1, optimal rate capability(76 F g–1 at 10 A g–1), and electrochemicalstability during galvanostatic charge/discharge cycling and folding/bendingstresses.
ISSN	19360851
Journal	ACS Nano
Volume Number	16
PubMed Central reference number	PMC9620411
Issue Number	10
PubMed reference number	36194759
e-ISSN	1936086X
DOI	10.1021/acsnano.2c05640
Language	English
Publisher	American Chemical Society
Publisher Date	2022-10-04
Access Restriction	Open
Rights License	Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). © 2022 The Authors. Published by American Chemical Society
Subject Keyword	solid-statesupercapacitors transition metal dichalcogenides niobium disulfide functionalization flexibility
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Physics and Astronomy Engineering Materials Science