Li Lu, Ai Zhiting, Wu Jifeng, Lin Zewen, Huang Muyun, Gao Yanan, Bai Hua
Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, Hainan University, Haikou, Hainan, China.
College of Materials, Xiamen University, Xiamen, PR China.
Nat Commun. 2024 Aug 3;15(1):6591. doi: 10.1038/s41467-024-50831-x.
Simultaneously achieving high mass loading and superior rate capability in electrodes is challenging due to their often mutually constrained nature, especially for pseudocapacitors for high-power density applications. Here, we report a robust porous polyaniline hydrogel (PPH) prepared using a facile ice-templated in situ polymerization approach. Owing to the conductive, robust, and porous nanostructures suitable for ultrafast electron and ion transport, the self-supporting pure polyaniline hydrogel electrode exhibits superior areal capacitance without sacrificing rate capability and gravimetric capacitance at an ultrahigh mass loading and notable current density. It achieves a high areal capacitance (15.2 F·cm at 500 mA·cm) and excellent rate capability (~92.7% retention from 20 to 500 mA·cm) with an ultrahigh mass loading of 43.2 mg cm. Our polyaniline hydrogel highlights the potential of designing porous nanostructures to boost the performance of electrode materials and inspires the development of other ultrafast pseudocapacitive electrodes with ultrahigh loadings and fast charge/discharge capabilities.
由于电极中高质量负载和优异倍率性能往往相互制约，同时实现这两点颇具挑战，对于高功率密度应用的赝电容器而言尤其如此。在此，我们报道了一种通过简便的冰模板原位聚合法制备的坚固多孔聚苯胺水凝胶（PPH）。由于其具有适合超快电子和离子传输的导电、坚固且多孔的纳米结构，自支撑纯聚苯胺水凝胶电极在超高质量负载和显著电流密度下，展现出优异的面积电容，同时不牺牲倍率性能和比电容。在500 mA·cm时，它实现了高面积电容（15.2 F·cm）和优异的倍率性能（从20至500 mA·cm保持约92.7%），且具有43.2 mg·cm的超高质量负载。我们的聚苯胺水凝胶凸显了设计多孔纳米结构以提升电极材料性能的潜力，并为开发其他具有超高负载和快速充放电能力的超快赝电容电极提供了启发。
