Paper-Based Solid-State Micro-supercapacitors Fabricated by Hydrophobic Wax Barrier Printing

• Published in: The Korean journal of chemical engineering Vol. 41; no. 3; pp. 763 - 772
• Main Authors: Kim, Na Yeon, Oh, In Hyeok, Chang, Suk Tai
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.03.2024; Springer Nature B.V; 한국화학공학회
• Subjects: Biotechnology; Catalysis; Charge transfer; Chemistry; Chemistry and Materials Science; Energy storage; Industrial Chemistry/Chemical Engineering; Ion charge; Manganese dioxide; Materials Science; Microelectrodes; Original Article; Solid state; Substrates; Supercapacitors; Waxes; 화학공학; Paper; Micro-supercapacitors; Wax printing; Flexible devices; Metal electrodes
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-024-00101-9

Flexible and small-scale energy storage technologies are critical for future applications such as wearable electronics. In this context, paper has emerged as a lightweight, low-cost, and ecologically friendly flexible substrate for energy storage devices. This paper presents a simple method for fabricating a micro-supercapacitor (MSC) using a wax printing approach that can achieve high resolution without requiring complex processes. In addition, the developed MnO 2 –Au-paper (MAP) microelectrodes with high porosity exhibit enhanced charge and ion transfer while maintaining a stable flexibility. The solid-state micro-supercapacitor delivers a very large areal capacitance of 624.32 mF cm −2 at 0.2 mA cm −2 and is stable under external stress. The highest energy and power densities obtained for the present MSCs (55.5 μWh cm −2 and 1.59 mW cm −2 , respectively), are much larger than those previously reported for pseudocapacitive MSCs, including flexible ones.