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Hydrogen bond crosslinking hydrogel for high-performance ultra-low temperature MXene-based solid state supercapacitors
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DOI：10.1016/j.electacta.2024.145065.png)
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Abstract
En 中文
The electrochemical performance of aqueous electrolytes at low temperatures is frequently suboptimal due to their low freezing point (0 degrees C). In this study, we constructed MXene-based ultra-low temperature polyvinyl alcohol/nanocellulose-H2SO4 (PVA/CNF-H2SO4) hydrogel electrolytes utilising hydrogen bonding between water molecules and nanocellulose. The process results in a reduction in the amount of free water present in the hydrogel electrolyte, lowering its freezing point to -77.35 degrees C. PVA/CNF-H2SO4-based solid-state supercapacitors (C7-SSC) demonstrate a capacitance of up to 813 mF cm(-2) at -50 degrees C, exhibiting high-rate performance at low temperatures. The capacitance remains at 45 F g(-1) at a current density of 20 A g(-1). The maximum areal energy and power densities of our C7-SSC achieve 113 mu Wh cm(-2) and 0.4 mu W cm(-2) at -50 degrees C, respectively, surpassing the majority of state-of-the-art devices. This work provides new insights into MXene-based hydrogel manufacturing and expands the range of potential applications for such materials.
Keywords:
Hydrogen bond
MXene
Low-temperature
Hydrogel
Solid state supercapacitors