Regulation of thermal migration channel in cellulose hydrogel to enhance thermopower

Xinyuan Cheng, Yang Hu, Pan Chen, Haisong Qi, Ang Lu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Ionic thermoelectric material is gaining increasing attention, and many attempts have been devoted to obtain huge ionic thermopower, which remains a big challenge. Herein, the idea of “ion thermal migration channel” was propose, and a high ionic thermopower was achieved by regulating the thermal migration channel in cellulose hydrogel system. It is found that the channels size as well as the channel-ion interaction played dominant roles. Initially, the channel size in cellulose/KCl hydrogel were optimized to enlarge the channel-Cl interactions via counter-ion condensation effect, which improved the thermopower from 2.45 mV·K−1 to 8.13 mV·K−1. Then, sodium alginate as polyanion was doped and multi-valance ion cross-linking was carried out, to further enhance the channel-Cl interaction, and a high thermopower of 22.09 mV·K−1 was realized. In addition, the cellulose based ionic thermoelectric hydrogel displayed viable basis for energy harvesting and temperature sensing as wearable flexible devices. The present work not only provides a systematic strategy for the thermopower regulation, but also supplies an applicable approach for the preparation of sustainable thermoelectric materials with biomass resources, demonstrating great potential in sustainability and green energy.

Original languageEnglish
Article number155161
JournalChemical Engineering Journal
Volume498
DOIs
Publication statusPublished - 15 Oct 2024

Keywords

  • Cellulose
  • Counterion condensation
  • Hydrogel
  • Ion thermal migration channel
  • Thermopower

Fingerprint

Dive into the research topics of 'Regulation of thermal migration channel in cellulose hydrogel to enhance thermopower'. Together they form a unique fingerprint.

Cite this

Cheng, X., Hu, Y., Chen, P., Qi, H., & Lu, A. (2024). Regulation of thermal migration channel in cellulose hydrogel to enhance thermopower. Chemical Engineering Journal, 498, Article 155161. https://doi.org/10.1016/j.cej.2024.155161