Multilayer Self‐Assemblies for Fabricating Graphene‐Supported Single‐Atomic Metal via Microwave‐Assisted Emulsion Micelle

Abstract

Inspired by molecular self‐assemblies in nature, this article reports a versatile strategy for confined encapsulation of single‐atomic metal into high‐quality rGO nanosheets by the microwave‐assisted emulsion micelle method. Multilayer self‐assembly of organometallics–surfactants micelles into the interlayer of nanosheets can not only promote microwave exfoliation and reduction of GO but also precisely control loading and distribution of single‐metal atoms. With this synthetic strategy, the simultaneous trinity of exfoliation, reduction, and composition are achieved for 1 min. Experimental results and density functional theory calculations demonstrate that graphene‐supported FeN4O2 sites exhibit optimal binding energy toward superior selective adsorption (adsorption amount of 1975.6 mg g−1 with separation efficiency of 97.6%) and electrocatalytic oxidation (TOFs as high as 1.31 min−1). This work provides a simple and efficient avenue for the large‐scale preparation of single‐atomic metal composites in environmental and energy fields.

One‐Pot Synthesis of Bi2S3/TiO2/rGO Heterostructure with Red Light‐Driven Photovoltaic Effect for Remote Electrotherapy‐Assisted Wound Repair

“…Graphene oxide (GO) provides adsorption sites for metal cations attributed to its native sp 2 hybridized carbon atoms conjugated with negatively charged oxygen‐containing surface groups such as carboxyl, hydroxyl, and epoxy groups. [ 24,33 ] When mixing poly (sodium 4‐styrenesulfonate) (PSS) with GO solution, the benzene ring of PSS formed a ππ conjugation with the sp 2 carbon atoms of GO, resulting in rapid adsorption on GO. [ 34 ] Moreover, the electrostatic repulsion of sulfonic acid groups prevented the nanosheets from aggregating (Figure S1, Supporting Information), while residual PSS has little effect on rGO conductivity (Figure S2, Supporting Information).…”

“…The thermal effects generated during this process are shown in Figure S13, Supporting Information, after 30 min of pulsed illumination, the temperature of BCHA rises from 24.4 to 34 °C, which is much lower than the temperature required for photothermal antibacterial. [43] Therefore, the photoelectric effect could produce enough current to affect cells, [33] while the thermal effect is negligible on the treatment.…”

Transformation of Organonitrogen‐Encapsulated MOFs into N‐Doped Fe3O4@C Nanopolyhedron via CVD Super‐Assembly for Photochemical Oxidation

“…[56] It was found that the best photocatalytic performance of 96.9% was obtained when pyrolyzed at 573 K. The obvious reduction in the removal efficiency of TMX was observed after the pyrolysis temperature increasing, and the catalytic activity of sample could be lost at 773 K. We considered that the photocatalytic ability of metallic sites was closely associated with the crystal defects and interfacial coordination of metallic oxides and heteroatom. [57] Meanwhile, MIL-101(Fe) with the same FeO clusters was also used as the host for CVD super-assembly of organonitrogen. The result shows that N-doped metallic oxide@carbon composites featured the In heterogeneous catalysis, the kinetic rate and turn-over frequencies (TOFs) are often applied to estimate catalytic efficiency of each metallic site.…”

“…By comparison, the higher adsorption energy (−0.31 eV) and shorter HN distance (1.978 Å) made TMX easily adsorb on pyridinic N (Figure S26, Supporting Information). [ 57 ] Secondly, the heterostructure of metal oxides/heteroatom composites exhibited a wider region of light absorption (as shown in UV–vis DRS). [ 61,62 ] The incorporation of nitrogen and carbon species as an inter‐band gap could effectively narrow the band gap of composite and increase the utilization of visible‐light absorption.…”