Transport channel engineering between MXene interlayers for Zn‐ion hybrid microsupercapacitor with enhanced energy output and cycle stability

Abstract

Two‐dimensional (2D) transition metal carbonitrides/nitrides (MXene) materials have proven to be promising alternatives as novel capacitor‐type electrodes for aqueous Zn‐ion hybrid microsupercapacitors (ZHMSCs). However, during self‐assembly processes, serious restacking between 2D MXene nanosheets induced by strong van der Waals forces makes ion transport channels narrow within the compact MXene film electrodes, which would result in poor energy output of ZHMSCs. Herein, interlayer transport channel engineering is designed by intercalating bacterial cellulose (BC) between MXene interlayers to develop MXene/BC electrodes with fast ion transport channels in contrast to pure MXene electrodes. Benefiting from fast anion intercalation/deintercalation on MXene/BC capacitor‐type cathode and reversible Zn stripping/plating on Zn foil anode, the fabricated ZHMSCs exhibit wide working potential windows (1.36 V), high areal capacitance (404 mF cm−2), and landmark areal energy density (94 µWh cm−2 at 1 mA cm−2). The areal capacitance and energy density of the developed ZHMSCs are much higher than those of the ZHMSCs based on pure MXene capacitor‐type cathode (239 mF cm−2/57 µWh cm−2 at 1 mA cm−2). Besides, the developed ZHMSCs can perform more than 10,000 cycles, showing outstanding capacity retention. In general, our work provides a novel strategy to break through the performance bottlenecks afflicting MXene‐based ZHMSCs.

Dual design of electrodes and electrolytes ensures flexible symmetric micro-supercapacitors with high energy density

“…Recently, flexible microelectronics, implantable medical monitoring sensors, and wearable electronics require compatible micro-energy-storage-devices that maintain a stable electrochemical performance output under various mechanical deformations. 36–45 Benefiting from the excellent electrochemical performance of a single AS-MSC device, we further designed and assembled a novel flexible AS-MSC device, as illustrated in Fig. 4a.…”

Recent progress of high-performance in-plane zinc ion hybrid micro-supercapacitors: design, achievements, and challenges

“…7f). 109 Owing to the fast anion intercalation/deintercalation of MXene/BC capacitor-type micro-cathode and reversible Zn stripping/plating on the Zn foil micro-anode (Fig. 7g), the as-fabricated ZIHMSCs showed a wider working voltage window (1.36 V), better cycling stability (70% after 10 000 cycles), and much higher areal capacitance than those of the ZIHMSCs based on the pure MXene cathode (404 vs. 239 mF cm −2 at 1 mA cm −2 ), demonstrating great potential for applications as the next-generation microscale power sources in small electronics (Fig.…”

Mechanically Improving Ion Diffusion in Layered Conducting Polymers for Compact Energy Storage

“…Recently, two-dimensional (2D) active materials, like transition metal disulfides (TMDs) , and transition metal carbide/nitride (MXene), , are in favor for compact electrode configurations in ECs. The densely packed layered structures of these active materials endow high apparent density .…”