Journal
ADVANCED MATERIALS
Volume 32, Issue 24, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201907254
Keywords
energy materials; PEDOT; PSS; smart textiles; supercapacitor; sweat; wearable
Categories
Funding
- EPSRC [EP/M002527/1, EP/R029644/1]
- Royal Society-SERB Newton International Fellowship [NIF\R1\182437]
- EPSRC [EP/M002527/1, EP/R029644/1] Funding Source: UKRI
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A sweat-based flexible supercapacitor (SC) for self-powered smart textiles and wearable systems is presented. The developed SC uses sweat as the electrolyte and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as the active electrode. With PEDOT:PSS coated onto cellulose/polyester cloth, the SC shows specific capacitance of 8.94 F g(-1) (10 mF cm(-2)) at 1 mV s(-1). With artificial sweat, the energy and power densities of the SC are 1.36 Wh kg(-1) and 329.70 W kg(-1), respectively for 1.31 V and its specific capacitance is 5.65 F g(-1). With real human sweat the observed energy and power densities are 0.25 Wh kg(-1), and 30.62 W kg(-1), respectively. The SC performance is evaluated with different volumes of sweat (20, 50, and 100 mu L), bending radii (10, 15, 20 mm), charging/discharging stability (4000 cycles), and washability. With successful on-body testing, the first demonstration of the suitability of a sweat-based SC for self-powered cloth-based sensors to monitor sweat salinity is presented. With attractive performance and the use of body fluids, the presented approach is a safe and sustainable route to meet the power requirements in wearable systems.
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