超级电容器
材料科学
阳极
阴极
电容
储能
纳米技术
化学工程
电化学
金属有机骨架
纳米纤维
碳纳米纤维
电极
吸附
碳纳米管
有机化学
物理化学
功率(物理)
化学
工程类
物理
量子力学
作者
Ying Huang,Mingming Gao,Yubin Fu,Junke Li,Faxing Wang,Sheng Yang,Mingchao Wang,Zhengfang Qian,Xing Lü,Panpan Zhang,Renheng Wang
标识
DOI:10.1016/j.ensm.2024.103522
摘要
Ammonium-ion (NH4+) hybrid supercapacitors are promising energy storage devices due to their low cost, high energy/power supply, and environmental friendliness. However, it remains a grand challenge to engineer electrode materials toward high-efficient NH4+ storage. Herein, we report 1D conjugated metal−organic frameworks (1D c-MOFs) grown on hierarchical porous carbon nanofibers (HPCNFs), representing an attractive NH4+ host material that enables fast diffusion kinetics. Featuring high electrical conductivity, hierarchical porous structure, and dense active sites, the HPCNFs embedded with Ni-BTA (BTA = 1,2,4,5-benzenetetramine) c-MOF composite (denoted as HPCNFs@Ni-BTA) delivers an ultrahigh specific capacitance of 678.5 F g−1 at 0.5 A g−1 and an outstanding rate capability (220.1 F g−1 at 10 A g−1). Experimental analyses and theoretical calculations confirm that, strong NH4+ adsorption capability comes from the reversible redox reaction occurred at NiN4 linkages between the C=N and C−N bonds. By coupling HPCNFs@Ni-BTA anode with HPCNFs cathode, the NH4+ full device outputs a high specific capacitance of 156 F g−1 at 0.3 A g−1 and a remarkable energy density of 48.8 Wh kg−1, outperforming most recently reported aqueous supercapacitors. This work provides an exciting strategy for designing advanced functional electrodes for the next-generation energy applications.
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