Fabrication of nitrogen-doped porous graphene hybrid nanosheets from metal–organic frameworks for lithium-ion batteries

Abstract

To achieve a good electrochemical performance of lithium-ion batteries (LIBs), the design and optimization of the anode is a key issue. Herein, the fabrication of nitrogen-doped porous graphene hybrid nanosheets (denoted as N-PGNS) is proposed via a simple functional group-induced growth of zeolitic imidazolate framework (ZIF-8) on graphene oxides (GO) followed by a one-step pyrolysis strategy. Detailed characterizations reveal that the N-doped porous carbon derived from ZIF-8 is homogeneously anchored on graphene, and can provide high electroactivity and numerous diffusion channels for fast Li+ transport. Meanwhile, the incorporation of graphene as a conductive framework and supporting substrate can accelerate the transfer of electrons. Taking advantage of the synergistic role between the graphene framework and N-doped porous carbon, the N-PGNS exhibits a stable reversible specific capacity of 741.8 mA h g–1 as the anode for LIBs, which is notably higher than that of the N-doped porous carbon obtained directly by pyrolysis of ZIF-8. Furthermore, the N-PGNS electrodes also show superior electrochemical stability with an initial capacity of 90.38% over 1000 cycles at 5 A g–1. The current strategy, which can control and adjust the growth of ZIF-8 via the inducing effect of GO, provides a promising solution to construct graphene hybrid nanosheets for high-performance LIBs.

Design of Highly Nitrogen-Doped, Two-Dimensional Hierarchical Porous Carbons with Superior Performance for Selective Capture of CO2 and SO2

“…Meanwhile, the N 1s XPS spectra of the GC- x s could be fitted into two main peaks centered at 398.2 and 400.4 eV, which can be assigned to the pyridinic and graphitic nitrogen species. Meanwhile, the overlap of the two peaks at around 399.5 eV in the GC- x s should be assigned to pyrrolic nitrogen. ,− Notably, the nitrogen contents in GC-1, GC-2, GC-4, and GC-6 were 16.2, 16.3, 16.0, and 11.6 wt %, respectively, and the GC-2 is the highest ratio of the pyridinic (62.6%) structure and total nitrogen contents (Table and Figure ).…”

Recent progress in metal–organic framework/graphene-derived materials for energy storage and conversion: design, preparation, and application

“…114,115 In this regard, it is intriguing to explore the integration of MOF-derived carbon with graphene, which is expected to be an effective way to increase both density of active sites and electrical conductivity. [116][117][118] Consequently, various MOF/graphenederived carbonaceous materials have been fabricated and show great potential in the eld of energy storage and conversion. [119][120][121] Among them, zeolitic imidazolate frameworks (ZIFs)/ graphene-derived carbonaceous materials are intensively investigated, mainly due to the large surface area and effective nitrogen doping caused by the methylimidazole (MeIM) ligand, which are benecial for the improved electrical conductivity, catalytic activity, capacitive performance, etc.…”

“…202 For example, nitrogen-doped porous graphene hybrid nanosheets derived from a ZIF-8/GO composite were reported to be a superior anode material for LIBs with a high reversible specic capacity of more than 700 mA h g À1 . 118,120 Furthermore, reasonable control of the pore size distribution to the mesoporous range can accelerate the migration of ions, since the micropores will restrict the ion/ electrolyte transport at high discharge rates. 203 Therefore, Gayathri et al prepared mesoporous-rich nitrogen-doped carbon@graphene nanosheets derived from a ZIF-8 precursor using melamine as a pore expanding agent and surface modi-er, which exhibited high specic capacity and excellent long cycle life compared to the melamine-unmodied anode.…”

Holey Layered Oxygen‐Rich Graphene Xerogels for High‐Performance Supercapacitors

“…These excellent properties make holey graphene materials a key component of high‐performance electrochemical energy storage and conversion devices (such as lithium‐ion batteries, supercapacitors). [ 18–21 ]…”

“…These excellent properties make holey graphene materials a key component of highperformance electrochemical energy storage and conversion devices (such as lithium-ion batteries, supercapacitors). [18][19][20][21] Wang et al [22] produced 3D interconnected macroporous porous graphene frameworks (GFs) by room-temperature fast assembly of GO nanosheets with assistance of Faradaic polyoxometalates (POM) and hydrazine hydrate (N 2 H 4 ), which labeled as POM-GFs. The as-prepared POM-GFs were compressed into compact POM-GFs films, which were directly used as free-standing…”