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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Nb2O5 quantum dots embedded in MOF derived nitrogen-doped porous carbon for advanced hybrid supercapacitor applications
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Nb2O5 quantum dots embedded in MOF derived nitrogen-doped porous carbon for advanced hybrid supercapacitor applications

机译：嵌入MOF衍生的氮掺杂多孔碳中的Nb2O5量子点，用于高级混合超级电容器应用

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摘要

Hybrid supercapacitors (HSCs), which are expected to possess the good characteristics of both lithium batteries and supercapacitors, have become a hot research topic in recent years for catering to the growing market for electric vehicles (EVs) and hybrid electric vehicles (HEVs). Herein, we demonstrate an advanced hybrid material construction by the orthorhombic Nb2O5 quantum dots embedded in nitrogen-doped porous carbon derived from ZIF-8 dodecahedrons, referred to as NQD-NC. Then the applications of this material in LIBs and HSCs are studied in-depth. The LIB test reveals that the novel Nb2O5-based material shows excellent high-rate capability and long-term cyclic stability. Importantly, by assembling a HSC device using a NQD-NC anode and a commercial activated carbon cathode with an organic electrolyte, the HSC shows superior electrochemical performance including ultra-high energy and power density (76.9 W h kg(-1) and 11 250 W kg(-1), respectively) and superior cyclic stability (capacity retention of similar to 85% at 5 A g(-1) after 4500 cycles in a voltage range of 0.5-3.0 V). The excellent electrochemical performance of the HSCs indicates combining the advantages of lithium-ion batteries and supercapacitors, which is promising for the next generation of energy storage systems.
机译：混合动力超级电容器（HSC）有望具有锂电池和超级电容器的良好特性，近年来已成为研究电动汽车（EV）和混合动力汽车（HEV）不断增长的市场的热门研究课题。在这里，我们演示了一种先进的杂化材料结构，该结构由嵌入ZIF-8十二面体（称为NQD-NC）的氮掺杂多孔碳中的正交晶体Nb2O5量子点构成。然后，对该材料在LIB和HSC中的应用进行了深入研究。 LIB测试表明，新型基于Nb2O5的材料具有出色的高倍率性能和长期循环稳定性。重要的是，通过组装使用NQD-NC阳极和带有有机电解质的商用活性炭阴极的HSC装置，HSC显示出优异的电化学性能，包括超高能量和功率密度（76.9 W h kg（-1）和11250） W kg（-1））和出色的循环稳定性（在0.5-3.0 V电压范围内4500次循环后，在5 A g（-1）下的容量保持率接近85％）。 HSC出色的电化学性能表明，锂离子电池和超级电容器的优势相结合，这对下一代储能系统很有希望。

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