Electrospun N‐Doped Porous Carbon Nanofibers Incorporated with NiO Nanoparticles as Free‐Standing Film Electrodes for High‐Performance Supercapacitors and CO₂ Capture

Abstract

Carbon nanofibers (CNF) with a 1D porous structure offer promising support to encapsulate transition-metal oxides in energy storage/conversion relying on their high specific surface area and pore volume. Here, the preparation of NiO nanoparticle-dispersed electrospun N-doped porous CNF (NiO/PCNF) and as free-standing film electrode for high-performance electrochemical supercapacitors is reported. Polyacrylonitrile and nickel acetylacetone are selected as precursors of CNF and Ni sources, respectively. Dicyandiamide not only improves the specific surface area and pore volume, but also increases the N-doping level of PCNF. Benefiting from the synergistic effect between NiO nanoparticles (NPs) and PCNF, the prepared free-standing NiO/PCNF electrodes show a high specific capacitance of 850 F g at a current density of 1 A g in 6 m KOH aqueous solution, good rate capability, as well as excellent long-term cycling stability. Moreover, NiO NPs dispersed in PCNF and large specific surface area provide many electroactive sites, leading to high CO uptake, and high-efficiency CO electroreduction. The synthesis strategy in this study provides a new insight into the design and fabrication of promising multifunctional materials for high-performance supercapacitors and CO electroreduction.

Zeolitic imidazolate framework derived ZnCo2O4 hollow tubular nanofibers for long-life supercapacitors

“…2d), metal-oxygen bond (O 2À , 528.9 eV), hydroxyl group (-OH, 530.6 eV) and adsorption water (H 2 O, 531.8 eV). 40,41 This study result further demonstrates the successful preparation of ZnCo 2 O 4 . For comparison, the PAN@Zn(Ac) 2 and PAN@Co(Ac) 2 composite nanobers are synthesized precisely by adjusting the kind of the adding metal element, aer a solvent method treatment in room temperature, the PAN@ZIF-8 and PAN@ZIF-67 core-shell nanobers are prepared, which is similar to the PAN@ZnCo-ZIF.…”

Space‐Confined Synthesis of ZIF‐67 Nanoparticles in Hollow Carbon Nanospheres for CO2 Adsorption

“…Hollow carbon nanospheres (HCSs) are regarded as a promising family of multifunctional advanced materials for many years due to their excellent properties such as high surface‐to‐volume ratios, good electrical conductivity, and remarkable durability . Benefitting from their unique physical and chemical properties, HCSs have many potential applications in catalysis, gas separation, and energy storage and conversion . As demonstrated in previous studies, HCSs coupled with a thin microporous shell are superior to other microporous nanomaterials because of the smaller diffusion resistance .…”

“…First, the remarkable durability stemming from the carbon framework would be highly beneficial for enduring harsh reaction conditions including acidic, alkaline, and organic regent . Secondly, meso‐/micropores distributed on the surface of carbon shell can provide pathways for the diffusion of mass, which would reduce the diffusion resistance . Last but not the least, the presence of huge inner space of HCSs with respect to the volume of carbon shell itself affords a huge reaction site.…”

Constructing Hierarchically Porous N-Doped Carbons Derived from Poly(ionic liquids) with the Multifunctional Fe-Based Template for CO2 Adsorption

“… 1 − 5 Therefore, it has a wide application scope in the fields of adsorption, energy, catalysis, environment and separation, and so forth. 6 − 9 The general strategy to prepare porous carbon materials with large surface areas and the abundant pore structure can be summarized thus: hard or soft templates are applied in the carbonization process of a nitrogen-containing precursor. 10 , 11 However, this method still faces challenges in some degree.…”