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High-performance moist-electric generator based on dynamic network design of functionalized nanocellulose hydrogel
Yachong Zhu1, Lishi Wei1, Shanshan Song1
1Key Laboratory of Bio-based Material Science and Technology, Ministry of Education, College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, PR China.
International Journal of Biological Macromolecules
|July 30, 2025
Summary
Researchers developed a new hydrogel from nanocellulose and polyacrylamide for moist-electric generators (MEGs). This material offers improved conductivity and stable power output across various conditions, enabling self-powered flexible electronics.
Area of Science:
- Materials Science
- Energy Harvesting
- Nanotechnology
Background:
- Hydrogels are ideal for moist-electric generators (MEGs) due to their hydrophilicity.
- Limitations in protonation and ionic diffusion hinder hydrogel-based MEG performance.
- Developing advanced hydrogels is crucial for efficient energy harvesting.
Purpose of the Study:
- To create a highly conductive and stretchable hydrogel for enhanced MEG applications.
- To investigate the electrical properties and environmental adaptability of the novel hydrogel.
- To demonstrate the potential of the hydrogel-based MEG as a power source for portable devices.
Main Methods:
- Fabrication of an ionic conductive hydrogel using functionalized nanocellulose (FCNF) and polyacrylamide (PAM) via UV-initiated polymerization and solvent substitution.
- Characterization of hydrogel properties, including stretchability and ionic conductivity.
- Construction and testing of a moist-electric generator (MEG) using the developed hydrogel, evaluating its electrical output and environmental stability.
Main Results:
- The developed FCH hydrogel exhibited good stretchability (250%) and high ionic conductivity (17.3 S m⁻¹).
- The MEG device demonstrated a stable electrical output (1 V open circuit voltage, 1.38 μA cm⁻² short circuit current density, 63 nW cm⁻² maximum power density).
- The MEG maintained stable performance across a wide humidity range (15-98% RH) and low temperatures (-20°C), with scalable output through series/parallel configurations.
Conclusions:
- The FCH hydrogel offers a promising material for developing efficient and stable moist-electric generators.
- The developed MEG technology is suitable for powering small electronic devices and presents a viable solution for portable self-powered systems.
- This work provides a novel, environmentally friendly approach for creating advanced hydrogels for flexible energy harvesting applications.
