Hollow particle-based N-doped carbon nanofibers synthesized via a facile electrospinning and carbonization method exhibit enhanced supercapacitive performance.

Robust nanofiber gels: Monolithic hydrogels and aerogels consisting of uniform carbonaceous nanofibers (CNFs) were fabricated on a macroscopic scale (12 L, see picture) by a simple template‐directed, hydrothermal carbonization process. The high surface reactivity of the CNFs and high porosity and robust nature of the gels can be exploited in applications such as selective adsorbents and templates for creating functional composite gels.

5104 www.MaterialsViews.com wileyonlinelibrary.comof heteroatom-doped carbon nanomaterials. In the past decades, there has been certain success in developing effective approaches for synthesizing heteroatomdoped carbon nanomaterials. [ 10,12,[16][17][18][19][20][21] However, despite great progress has been made, the preparation of different heteroatom-doped carbon materials is rarely a general strategy; furthermore, the preparation of these existing heteroatomdoped carbon materials, specifi cally 3D network monolith, usually involves either complicated and expensive instruments, or harsh, complex, and time-consuming synthesis routes, or hazardous chemicals (e.g., concentrated sulfuric acid), all that have seriously restricted their practical applications. Accordingly, it is highly desirable to exploit a simple, renewable, scalable, but multifunctional and general strategy to effectively engineer 3D heteroatom-doped carbon nanomaterials, which is crucial for widespread implementation and commercialization.Bacterial cellulose (BC), a bio-product produced from fermentation, has attracted much attention due to its wide availability, low cost, renewability, and porous nature. [ 6,14,22,23 ] Herein, we demonstrate a highly effi cient, convenient, lowcost, and general strategy to fabricate heteroatom-doped carbon nanomaterials based on the characteristic abundant surface functional groups (hydroxy/carboxylic groups) of BC, [ 24 ] in which the BC serves as an excellent platform for introducing different heteroatoms into the framework of carbon nanomaterials. Specifi cally, P-doped, N,P-co-doped, and B,P-co-doped carbon nanofi bers were successfully prepared by impregnating H 3 PO 4 , NH 4 H 2 PO 4 , and H 3 BO 3 / H 3 PO 4 into the BC pellicle, respectively, followed by carbonization in an inert atmosphere at 800 °C. Compared with previous reports, our approach has three signifi cant advantages for constructing 3D macroscopic heteroatom-doped carbon materials, namely, i) the raw materials are abundant and cheap, ii) the preparation process is easy handling, versatile, and general, and iii) the fabrication is generally suitable for an industrial scale-up. To demonstrate the application potential of the as-prepared heteroatom-doped carbon nanomaterials, here we show the utilization of N,P-co-doped carbon nanofi bers in electrode materials of supercapacitor devices. The as-constructed supercapacitor exhibits high power density and excellent cycling stability.Recently, heteroatom-doped three-dimensional (3D) nanostructured carbon materials have attracted immense interest because of their great potential in various applications. Hence, it is highly desirable to exploit a simple, renewable, scalable, multifunctional, and general strategy to engineer 3D heteroatom-doped carbon nanomaterials. Herein, a simple, eco-friendly, general, and effective way to fabricate 3D heteroatom-doped carbon nanofi ber networks on a large scale is reported. Using this method, 3D P-doped, N,Pco-doped, and B,P-co-doped carbon nanofi ber networks are...

A new kind of high-performance asymmetric supercapacitor is designed with pyrolyzed bacterial cellulose (p-BC)-coated MnO₂ as a positive electrode material and nitrogen-doped p-BC as a negative electrode material via an easy, efficient, large-scale, and green fabrication approach. The optimal asymmetric device possesses an excellent supercapacitive behavior with quite high energy and power density.