Search

While stretchable micro‐supercapacitors (MSCs) have been realized, they have suffered from limited areal electrochemical performance, thus greatly restricting their practical electronic application. Herein, a facile strategy of 3D printing and unidirectional freezing of a pseudoplastic nanocomposite gel composed of Ti3C2Tx MXene nanosheets, manganese dioxide nanowire, silver nanowires, and fullerene to construct intrinsically stretchable MSCs with thick and honeycomb‐like porous interdigitated electrodes is introduced. The unique architecture utilizes thick electrodes and a 3D porous conductive scaffold in conjunction with interacting material properties to achieve higher loading of active materials, larger interfacial area, and faster ion transport for significantly improved areal energy and power density. Moreover, the oriented cellular scaffold with fullerene‐induced slippage cell wall structure prompts the printed electrode to withstand large deformations without breaking or exhibiting obvious performance degradation. When imbued with a polymer gel electrolyte, the 3D‐printed MSC achieves an unprecedented areal capacitance of 216.2 mF cm−2 at a scan rate of 10 mV s−1, and remains stable when stretched up to 50% and after 1000 stretch/release cycles. This intrinsically stretchable MSC also exhibits high rate capability and outstanding areal energy density of 19.2 µWh cm−2 and power density of 58.3 mW cm−2, outperforming all reported stretchable MSCs. [ABSTRACT FROM AUTHOR]

Keywords: 3D printing; MXene; stretchable micro-supercapacitor; thick electrode; wearable electronics EN 3D printing MXene stretchable micro-supercapacitor thick electrode wearable electronics 1 1 1 04/16/20 20200414 NES 200414 In article number 1903794, Jiajie Liang and co-workers present a strategy for the 3D-printing and unidirectional freezing of a nanocomposite gel composed of MXene, MnO SB 2 sb nanowires (NWs), AgNWs, and C60 to construct intrinsically stretchable micro-supercapacitors (MSCs) with thick and honeycomb-like porous interdigitated electrodes. The 3D-printed MSC exhibits high areal capacitance of 216.2 mF cm SP -2 sp at 10 mV s SP -1 sp , and remains stable when stretched up to 50%. 3D printing, MXene, stretchable micro-supercapacitor, thick electrode, wearable electronics. [Extracted from the article]