Converting soy protein isolate into biomass-based polymer electrolyte by grafting modification for high-performance
Jian Wang1, Zhiyu Xun1, Chenyang Zhao1
1Key Laboratory of Bio-based Materials Science & Technology (Northeast Forestry University), Ministry of Education, Harbin 150040, China; College of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, China.
International Journal of Biological Macromolecules
|April 10, 2022
Summary
Soy protein isolate (SPI) was modified with acrylamide to create a high-performance polymer electrolyte. This advancement enhances energy storage devices, offering improved conductivity and capacitance retention for supercapacitors.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Soy protein isolate (SPI) is an abundant plant protein with limited application in energy storage due to processing and performance issues.
- Existing SPI-based materials face challenges in film formation and electrochemical efficiency for energy storage devices.
Purpose of the Study:
- To develop a high-performance SPI-based polymer electrolyte for energy storage applications.
- To enhance the electrochemical properties of SPI through grafting modification.
Main Methods:
- Grafting modification of soy protein isolate (SPI) with acrylamide (AM) to create a gel polymer electrolyte (GPE).
- Characterization of the GPE's ionic conductivity and electrochemical performance in supercapacitors.
- Fabrication of redox-active polymer electrolytes by combining modified SPI with KI.
Main Results:
- The optimized GPE achieved an ionic conductivity of 5.10 mS cm-1, significantly higher than unmodified SPI (1.84 mS cm-1).
- Supercapacitors using modified SPI demonstrated a specific capacitance of 141.74 F g-1 and 95% capacitance retention after 8000 cycles.
- Redox-active electrolytes improved supercapacitor energy density to 27.52 Wh kg-1.
Conclusions:
- Grafting modification offers a facile strategy to produce high-performance SPI-based polymer electrolytes.
- This research lays the foundation for high-value applications of SPI in advanced energy storage devices.
- Modified SPI shows significant potential for improving supercapacitor performance, including conductivity, capacitance, and energy density.
