Liu, YuqingYuqingLiuZhang, ShuaiShuaiZhangZhou, YuetongYuetongZhouBuckingham, Mark A.Mark A.BuckinghamLEIGH ALDOUSSherrell, Peter C.Peter C.SherrellWallace, Gordon G.Gordon G.WallaceRyder, GregoryGregoryRyderFaisal, ShaikhShaikhFaisalOfficer, David L.David L.OfficerBeirne, StephenStephenBeirneChen, JunJunChen2024-09-182024-09-182020https://www.scopus.com/record/display.uri?eid=2-s2.0-85091759643&origin=resultslisthttps://scholars.lib.ntu.edu.tw/handle/123456789/721016論文編號: 2002539Thermoelectrochemical 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. © 2020 Wiley-VCH GmbHbody heatelectrode/electrolyte integrationgel electrolytesthermocells[SDGs]SDG7journal article10.1002/aenm.2020025392-s2.0-85091759643