4.2 V wearable asymmetric supercapacitor devices based on a VOx//MnOx paper electrode and an eco-friendly deep eutectic solvent-based gel electrolyte

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Vol. 6; no. 42; pp. 20686 - 20694
• Main Authors: Ming-Jay Deng, Tzung-Han Chou, Li-Hsien Yeh, Jin-Ming, Chen, Lu, Kueih-Tzu
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 2018
• Subjects: Capacitance; Durability; Electric potential; Electrodes; Electrolytes; Electronic devices; Electronic equipment; Eutectics; High voltages; Internet of Things; Manganese; Manganese oxides; Nanofibers; Solvents; Supercapacitors; Twisting; Vanadium; Vanadium oxides; Voltage; Wearable technology
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/c8ta06018e

In this work, we successfully fabricated 3D network vanadium oxide (VOx) and manganese oxide (MnOx) nanofibers on conductive paper (PVA–acetamide–LiClO4-graphite/paper, PGP) as electrodes linked with an eco-friendly PVA–acetamide–LiClO4 (PAL) deep eutectic solvent-based gel electrolyte for high-voltage wearable asymmetric supercapacitors (HVWASCs). An ecologically compatible deep eutectic solvent-based electrolyte with self-supporting electroactive species has been generally accepted as a unique type of cost-effective and green electrolyte that possibly involves a bulk concentration of the electroactive species and a large working potential window, thereby achieving a high performance. The HVWASCs are able to work with a large operating voltage of 4.2 V, and supply outstanding energy and power densities (245 W hkg−1 at 0.18 W kg−1 and 95.3 kW kg−1 at 98 W h kg−1). The HVWASCs demonstrate remarkable cycling stability and durability after 6000 cycles, including bending and twisting (capacitance retention of 91.5%). The HVWASCs are a superior prospective candidate for wearable/flexible electronic devices and Internet of Things (IoT) applications.