ITO nanoparticles break optical transparency/high-areal capacitance trade-off for advanced aqueous supercapacitors

摘要: The ever-increasing demand for energy storage in portable electronic devices is driving research on supercapacitor technology. In this context, optical transparency and mechanical robustness of supercapacitors are the key properties development next-generation multifunctional devices, such as head-up displays, high-aesthetic touch screens monolithic conversion/storage integrated systems. Here, we demonstrate that indium tin oxide nanoparticles (ITO NPs) ideal materials a facile solution-processed fabrication transparent/semi-transparent electrodes with high areal capacitance (Careal) aqueous solutions (1 M Na2SO4), overcoming crucial trade-off between performance. particular, our ITO NP exhibit Careal values 0.40, 0.72 1.53, 3.41, 6.45 mF cm−2 at 0.2 mA transmittance (T) 81.9%, 69.7%, 64.4%, 46.6% 26.7% 550 nm, respectively. current densities higher than 1.2 record-high (i.e., 0.81, 1.76 3.17 10 T nm). Indium nanoparticle show 94% retention over 10 000 charge–discharge cycles. Flexible also designed polyethylene terephthalate substrate, showing operational activity 100 bending cycles under curvature radii 1 0.5 cm. Finally, coating electrode photoactive polymer, i.e., rr-poly(3-hexylthiophene), permits light-powered supercapacitor, clear-cut case an innovative hybrid electric power delivery device, storing density 17.54 nW h simulated sunlight illumination.