In this present work, N-doped carbon nanobelts (N-CNBs) were prepared by a confined-pyrolysis approach and the N-CNBs were derived from a polypyrrole (Ppy) tube coated with a compact silica layer. The silica layer provided a confined space for the Ppy pyrolysis, thereby hindering the rapid overflow of pyrolysis gas, which is the activator for the formation of carbonaceous materials. At the same time, the confined environment can activate the carbon shell to create a thin wall and strip the carbon tube into belt morphology. This process of confined pyrolysis realizes self-activation during the pyrolysis of Ppy to obtain the carbon nanobelts without adding any additional activator, which reduces pollution and preparation cost. In addition, this approach is simple to operate and avoids the disadvantages of other methods that consume time and materials. The as-prepared N-CNB shows cross-linked nanobelt morphology and a rich porous structure with a large specific surface area. As supercapacitor electrode materials, the N-CNB can present abundant active sites, and exhibits a specific capacitance of 246 F·g⁻¹, and excellent ability with 95.44% retention after 10000 cycles. This indicates that the N-CNB is an ideal candidate as a supercapacitor electrode material.

在目前的工作中，N 掺杂的碳纳米带 (N-CNBs) 通过受限热解方法制备，N-CNBs 来自涂有致密二氧化硅层的聚吡咯 (Ppy) 管。二氧化硅层为 Ppy 热解提供了一个密闭的空间，从而阻碍了热解气体的快速溢出，这是形成含碳材料的活化剂。同时，密闭环境可以激活碳壳以形成薄壁并将碳管剥离成带状形态。这种密闭热解过程实现了Ppy热解过程中的自活化，得到碳纳米带，无需添加任何额外的活化剂，降低了污染和制备成本。此外，这种方法操作简单，避免了其他方法耗时耗材的缺点。所制备的 N-CNB 显示出交联的纳米带形态和具有大比表面积的丰富多孔结构。作为超级电容器电极材料，N-CNB具有丰富的活性位点，比电容为246 F·g^-1，并且在 10000 次循环后具有 95.44% 的出色性能。这表明 N-CNB 是作为超级电容器电极材料的理想候选材料。