Advanced Wearable Thermocells for Body Heat Harvesting

Yuqing Liu, Shuai Zhang, Yuetong Zhou, Mark A. Buckingham, Leigh Aldous, Peter C. Sherrell, Gordon G. Wallace*, Gregory Ryder, Shaikh Faisal, David L. Officer, Stephen Beirne, Jun Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

105 Citations (Scopus)

Abstract

Thermoelectrochemical cells (thermocells) designed for harvesting human body heat can provide constant power output for wearable electronics, supplementing state-of-the-art flexible power storage and conversion solutions. However, a systematic investigation into the optimization of wearable thermocells is lacking, especially with regard to device design, n-type electrolytes, and electrode/electrolyte integration. Here, a n-type gel electrolyte: polyvinyl alcohol-FeCl2/3 with outstanding flexibility and elasticity and exceptional electrolyte/electrode integration into a 3D porous poly(3,4-ethylenedioxythiophene)/polystyrenesulfonate (PEDOT/PSS) electrode, is produced via an in situ chemical crosslinking method. The integrated n-type cell shows excellent seebeck coefficients (0.85 mV K−1) and output current density (1.74 A m−2 K−1) that are comparable with an optimized p-type cell consisting of a carboxymethylcellulose-K3/4Fe(CN)6 electrolyte with a 3D PEDOT/PSS-edge functionalized graphene/carbon nanotube electrode (−1.22 mV K−1 and 1.85 A m−2 K−1). The equivalent performance of the n-type and p-type cells enables the effective series connection of up to 18 pairs of p–n cells that combines to give an output voltage of 0.34 V (∆T = 10 K). This in-series device is fabricated into a proof-of-concept watch strap, which can harvest body heat, charge supercapacitor (up to 470 mF) as well as illuminate a green light emitting diode, demonstrating the practical applications.

Original languageEnglish
Article number2002539
JournalAdvanced Energy Materials
Volume10
Issue number48
Early online date1 Oct 2020
DOIs
Publication statusPublished - 22 Dec 2020

Keywords

  • body heat
  • electrode/electrolyte integration
  • gel electrolytes
  • thermocells

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