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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Binary metal sulfides and polypyrrole on vertically aligned carbon nanotube arrays/carbon fiber paper as high-performance electrodes
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Binary metal sulfides and polypyrrole on vertically aligned carbon nanotube arrays/carbon fiber paper as high-performance electrodes

机译：垂直排列的碳纳米管阵列/碳纤维纸上的二元金属硫化物和聚吡咯作为高性能电极

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摘要

Pseudocapacitive materials, such as binary metal sulfides, show great promise as electrode candidates for energy storage devices due to their higher specific capacitance than that of mono-metal sulfides and binary metal oxides, but generally suffer from low energy densities when assembled in supercapacitor devices. To push the energy density limit of pseudocapacitive materials in devices, a new class of electrode materials with favorable architectures is strongly needed. Here, rationally designed and coaxially grown Ni-Co-S and polypyrrole on vertically aligned carbon nanotube (VA-CNT) arrays/3D carbon fiber paper (CFP) is presented as a novel freestanding electrode for energy storage devices. Our study has revealed that the catalyst preparation is the key step and the presence of an Al2O3 buffer layer is essential for the growth of VA-CNTs. The 3D hierarchical VA-CNTs/CFP allows high areal loading and high utilization efficiency of the active materials. The binder-free asymmetric energy storage devices with Ni-Co-S/VA-CNTs/CFP as the positive electrode and polypyrrole/VA-CNTs/CFP as the negative electrode, respectively, demonstrate a high energy density of 82 W h kg(-1) at 200 W kg(-1).
机译：伪电容材料，例如二元金属硫化物，由于其比电容高于单金属硫化物和二元金属氧化物的比电容，因此有望作为储能设备的电极候选材料，但在超级电容器设备中组装时，其能量密度通常较低。为了推动装置中伪电容材料的能量密度极限，强烈需要具有有利结构的新型电极材料。在此，提出了在垂直排列的碳纳米管（VA-CNT）阵列/ 3D碳纤维纸（CFP）上合理设计并同轴生长的Ni-Co-S和聚吡咯，作为一种新型的储能装置独立式电极。我们的研究表明，催化剂的制备是关键步骤，而Al2O3缓冲层的存在对于VA-CNT的生长至关重要。 3D分层VA-CNT / CFP允许活性物质的高面积载荷和高利用效率。以Ni-Co-S / VA-CNTs / CFP为正极，以聚吡咯/ VA-CNTs / CFP为负极的无粘结剂不对称储能装置显示出82 W h kg（的高能量密度-1）在200 W kg（-1）下。

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