Highly Ordered Mesoporous Few‐Layer Graphene Frameworks Enabled by Fe₃O₄ Nanocrystal Superlattices

Abstract

While great progress has been achieved in the synthesis of ordered mesoporous carbons in the past decade, it still remains a challenge to prepare highly graphitic frameworks with ordered mesoporosity and high surface area. Reported herein is a simple synthetic methodology, based on the conversion of self-assembled superlattices of Fe3 O4 nanocrystals, to fabricate highly ordered mesoporous graphene frameworks (MGFs) with ultrathin pore walls consisting of three to six stacking graphene layers. The MGFs possess face-centered-cubic symmetry with interconnected mesoporosity, tunable pore width, and high surface area. Because of their unique architectures and superior structural durability, the MGFs exhibit excellent cycling stability and rate performance when used as anode materials for lithium-ion batteries, thus retaining a specific capacity of 520 mAh g(-1) at a current density of 300 mA g(-1) after 400 cycles.

Hierarchically‐Porous Carbon Derived from a Large‐Scale Iron‐based Organometallic Complex for Versatile Energy Storage

“…The catalytic method with transition metals has been identified as an effective path to obtain the graphitizedc arbon material, becausei tc an be achieveda tl ow temperatures. [24][25][26] Here, the absolute conversion of iron(III)t oi ron(0) is confirmed by the XRD pattern of carbonized FSA (CFSA)i nF igure 2a, which aligns with that of iron (PDF#65-4899). Therefore, the www.chemsuschem.org catalysis effect of iron is well utilized when the temperaturei s only 600 8C, which is illustrated by the XRD and Raman results.…”

Structural design of graphene for use in electrochemical energy storage devices

“…157 The mesoporous graphene frameworks have a face-centered cubic symmetry with interconnected mesoporosity, a tunable pore width and a high surface area. The rGO hollow spheres can provide a higher SSA for electrochemical reactions, which should lead to a higher electrochemical performance.…”

Hierarchical porous carbon microrods composed of vertically aligned graphene-like nanosheets for Li-ion batteries

“…The initial Coulombic efficiency of HPCM-900 is ~34% at 0.1 Ag -1 , higher than PECVD growth of VAGNs (~30%), 23 mesoporous graphene nanosheets (~29%), 46 and ordered mesoporous graphene frameworks (~28%). 47 The large irreversible capacity measured in the 1 st cycle has been often observed for porous carbon nanostructures, which can be attributed to the formation of a solid electrolyte interphase (SEI) layer on the surface of carbon and/or to the irreversible Li insertion into special positions such as the vicinity of residual H atoms. [47][48][49] After the 1 st cycle, the capacity of HPCM-900 became highly stable and reversible (Fig.…”