A Honeycomb‐Like Bulk Superstructure of Carbon Nanosheets for Electrocatalysis and Energy Storage

Abstract

Superstructures have attracted extensive attention because of their potential applications in materials science and biology. Herein, we fabricate the first centimeter-sized porous superstructure of carbon nanosheets (SCNS) by using metalorganic framework nanoparticles as a template and polyvinylpyrrolidone as an additional carbon source. The SCNS shows a honeycomb-like morphology with wall-sharing carbon cages, in each cavity of which a porous carbon sphere is encapsulated. A single piece of SCNS is directly used as the electrode for a two-electrode symmetrical supercapacitor cell without any binders and supports, benefiting from its advantage in ultra-large geometric size, and the Fe-immobilized SCNS exhibits excellent catalytic performances for oxygen reduction reaction and in a Zn-air battery. This synthetic strategy presents a facile approach for preparing functional SCNS at centimetric scale with controllable morphologies and compositions favoring the fabrication of energy devices.

One-Step Synthesis of Ultrathin Carbon Nanoribbons from Metal–Organic Framework Nanorods for Oxygen Reduction and Zinc–Air Batteries

“…37 3c). 6 The N 1s spectrum can be divided into three peaks located at 398.4, 400.1 and 401.2 eV, corresponding to the pyridinic, pyrrolic and graphitic N species, respectively (Figure 3d). 42,43 As shown in the Fe 2p spectrum, the large area of Fe(0)…”

“…[1][2][3] Two-dimensional (2D) carbon nanostructures, including graphene, carbon nanosheets and carbon nanoribbons (CNRibs), have emerged as a group of new-generation functional materials, and have been extensively studied in the fields of optics, catalysis, energy storage and so on. [5][6][7] Among these fascinating carbon materials, ultrathin CNRibs constructed by a few layers of carbon atoms not only acquire the exceptional advantages of graphene but also present the anisotropic features like one-dimensional (1D) nanostructures, rendering them unconventional physical and chemical properties. [8][9][10] To date, several methods including mechanical or chemical exfoliation process, 11,12 bottom-up organic synthesis 13 and electro deposition 14 have been developed to synthesize 2D CNRibs, while the morphologies and compositions of resulting materials are difficult to be modulated, especially engineering pores or grafting metal actives species on the surface.…”

Recent Advances on MOF Derivatives for Non-Noble Metal Oxygen Electrocatalysts in Zinc-Air Batteries

“…Carbon materials have the advantages of low cost, environmental acceptability, positive conductivity and stability [ 71 , 72 ]. When doped with heteroatom such as nitrogen, phosphorus, boron, sulfur, oxygen and other heteroatoms, they often exhibit enhanced catalytic activity.…”

Strategies to improve electrochemical performances of pristine metal‐organic frameworks‐based electrodes for lithium/sodium‐ion batteries

“…As electrode materials for energy storage devices, MOFs are mainly divided into two categories: pristine MOFs materials 41–43 and their derived nanostructures (such as nanoporous carbons and metal oxides) 44–46 . In recent years, there have been a great number of research on the pyrolysis of MOFs as precursors to obtain nanoscale metals or metal compounds and nanostructured carbon materials, and most of the materials derived from MOFs have better electrochemical properties than traditional materials 47–50 . However, it cannot be ignored that the pyrolysis of MOFs as templates requires a large amount of energy under high‐temperature conditions, which will cause certain pollution to the environment 51 .…”