Deep Eutectic Solvent Gel Electrolytes Reinforced with Cellulose Nanofibers for High‐Performance Flexible Solid‐State Supercapacitors

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 14, 2025

Abstract Flexible solid‐state supercapacitors (SCs) are crucial for wearable electronics, offering high safety and outstanding cycling stability. However, conventional hydrogel electrolytes suffer from poor mechanical strength, weak electrode adhesion, low voltage windows, instability under extreme conditions, limiting their applications. Herein, this study presents sustainable eco‐friendly cellulose nanofibers (CNF)‐reinforced polyacrylic acid/deep eutectic solvents/CNF (PAA/DES/CNF) ion‐gel with all‐round properties. The PAA/DES/CNF electrolyte exhibits exceptional ionic conductivity (45.5 mS cm −1 ), a broad electrochemical stability window (0–1.6 V) over wide temperature range (−20–60 °C). These enhanced properties attributed to the dynamic ion transport pathways facilitated by interactions between CNF, PAA, DES. abundant interaction sites on CNF impart superior robust excellent self‐healing capabilities. Based these characteristics, assembled supercapacitor specific capacitance 94.4 F g at current density of 1 A , maintains 93% capacity deformation temperatures, alongside retention (up 90.1%) 5000 cycles. This work provides valuable insights into design development sustainable, environmentally adaptable, highly flexible energy storage devices.

Language: Английский

Thermally Stable and Shape‐Adaptive Triboelectric Nanogenerators Based on Liquid Electrolytes with Low Vapor Pressure

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 22, 2025

Abstract Aqueous solution‐based liquid electrode triboelectric nanogenerators (TENGs) have attracted considerable interest in recent years due to their exceptional stretchability, deformability, and inherent shape‐adaptability. However, previous aqueous TENGs face challenges related drying, which may lead operational failures. In this study, a low‐vapor pressure (LVPL) TENG (LVPL‐TENG) is presented that uses branched polyethyleneimine (bPEI) or deep eutectic solvent, choline chloride/glycerol (ChCl:Gly), increase the stability of at high temperatures. The LVPL‐TENGs achieve power density ≈6.2 4.0 w m −2 when using bPEI ChCl:Gly as electrodes, respectively. Furthermore, these devices remarkable energy harvesting capabilities while being stretched up 400%. Importantly, maintain constant electrical output after stored 100 °C for 24 h. Utilizing simple single‐electrode design, can efficiently harvest various small physiological movements, i.e., finger bending, grasping coffee cup, clicking computer mouse. Additionally, potential function self‐powered tactile sensors detect touch any material object, indicating promising applications realm human‐machine interaction. This study opens new avenues deploying stretchable shape‐adaptable operating

Language: Английский

Advancing wearable triboelectric nanogenerators: enhancing stability and reliability

Nano Energy, Journal Year: 2024, Volume and Issue: unknown, P. 110623 - 110623

Published: Dec. 1, 2024

Language: Английский