Graphitic carbon nitride nanosheets are extracted, produced via simple liquid-phase exfoliation of a layered bulk material, g-C3N4. The resulting nanosheets, having ≈2 nm thickness and N/C atomic ratio 1.31, show an optical bandgap 2.65 eV. demonstrated to exhibit excellent photocatalytic activity for hydrogen evolution under visible light. As service our authors readers, this journal provides supporting information supplied by the authors. Such materials peer reviewed may be re-organized...

Three-dimensional (3D) N-doped graphene aerogel (N-GA)-supported Fe(3)O(4) nanoparticles (Fe(3)O(4)/N-GAs) as efficient cathode catalysts for the oxygen reduction reaction (ORR) are reported. The hybrids exhibit an interconnected macroporous framework of sheets with uniform dispersion (NPs). In studying effects carbon support on NPs ORR, we found that Fe(3)O(4)/N-GAs show a more positive onset potential, higher cathodic density, lower H(2)O(2) yield, and electron transfer number ORR in...

Abstract Heteroatom (N or S)‐doped graphene with high surface area is successfully synthesized via thermal reaction between oxide and guest gases (NH 3 H 2 S) on the basis of ultrathin oxide‐porous silica sheets at temperatures. It found that both N S‐doping can occur annealing temperatures from 500 to 1000 °C form different binding configurations edges planes graphene, such as pyridinic‐N, pyrrolic‐N, graphitic‐N for N‐doped thiophene‐like S, oxidized S S‐doped graphene. Moreover, resulting...

Sandwich-like, graphene-based carbon nitride nanosheets (G–CN), among many other advantages, show an enhanced electrical conductivity. Oxygen atoms can thus access the catalyst surface easily and rapid diffusion of electrons in electrode during oxygen reduction process is facilitated. G–CN hence serve as metal-free electrocatalysts for reactions (ORR) with excellent performance. Detailed facts importance to specialist readers are published "Supporting Information". Such documents...

Three-dimensional graphene-based frameworks (3D-GFs) with hierarchical macro- and meso-porous structures are presented. The interconnected macropores derived from hydrothermally assembled 3D graphene aerogels (GAs), while the mesopores generated by silica networks uniformly grown on surface of graphene. resulting 3D-GFs exhibit narrow mesopore size distribution (2-3.5 nm), high area, low mass density. These intriguing features render a promising template for creating various porous...

Storage shells: The assembly of negatively charged graphene oxide and positively nanoparticles by electrostatic interactions, subsequent chemical reduction, leads to metal oxides encapsulated in flexible ultrathin shells (see picture). These electrochemically active show a remarkable lithium storage capacity, with an excellent cycle performance. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or...

Electrostatic assembly between Fe3O4 nanospheres and graphene oxide, subsequent hydrothermal with additional sheets, leads to encapsulated in the shells interconnected by networks. Such 3D Fe3O4/graphene foams exhibit enhanced lithium storage excellent cycling performance rate capability.

As a newly developed material, carbon gels have been receiving considerable attention due to their multifunctional properties. Herein, we present facile, green, and template-free route toward sponge-like carbonaceous hydrogels aerogels by using crude biomass, watermelon as the source. The obtained three-dimensional (3D) flexible are made of both nanofibers nanospheres. porous (CGs) highly chemically active show excellent mechanical flexibility which enable them be good scaffold for synthesis...

The high cost of platinum-based electrocatalysts for the oxygen reduction reaction (ORR) has hindered practical application fuel cells. Thanks to its unique chemical and structural properties, nitrogen-doped graphene (NG) is among most promising metal-free catalysts replacing platinum. In this work, we have developed a cost-effective synthesis NG by using cyanamide as nitrogen source oxide precursor, which led controllable contents (4.0% 12.0%) after pyrolysis. thermally treated at 900 °C...

Although rechargeable aqueous zinc-ion batteries have attracted extensive interest due to their environmental friendliness and low cost, they still lack suitable cathodes with high rate capabilities, which are hampered by the intense charge repulsion of bivalent Zn2+ . Here, a novel intercalation pseudocapacitance behavior ultrafast kinetics into unique tunnels VO2 (B) nanofibers in electrolyte demonstrated via situ X-ray diffraction various electrochemical measurements. Because possess...

Graphene oxide-supported polyaniline (PANI@GO) composites were synthesized by chemical oxidation and characterized SEM, Raman FT-IR spectroscopy, TGA, potentiometric titrations, XPS. The characterization indicated that PANI can be grafted onto the surface of GO nanosheets successfully. sorption U(VI), Eu(III), Sr(II), Cs(I) from aqueous solutions as a function pH initial concentration on PANI@GO was investigated. maximum capacities at 3.0 T = 298 K calculated Langmuir model 1.03, 1.65, 1.68,...

2D sandwich-like sheets of iron oxide grown on graphene as high energy anode material for supercapacitors are prepared from the direct growth FeOOH nanorods surface and subsequent electrochemical transformation to Fe3O4. The Fe3O4@RGO nanocomposites exhibit superior capacitance (326 F g−1), density (85 Wh kg−1), large power, good cycling performance in 1 mol L−1 LiOH solution.

The adsorption and desorption of U(VI) on graphene oxides (GOs), carboxylated GOs (HOOC-GOs), reduced (rGOs) were investigated by batch experiments, EXAFS technique, computational theoretical calculations. Isothermal adsorptions showed that the capacities > HOOC-GOs rGOs, whereas desorbed amounts rGOs kinetics. According to analysis, inner-sphere surface complexation dominated at pH 4.0, outer-sphere rGO was observed which consistent with modeling. Based calculations, binding energy...

Sandwich-like, graphene-based mesoporous titania (G-TiO2) nanosheets possess thin thickness, large aspect ratio, and structure show enhanced electrical conductivity. Such unique features provide numerous open channels for the access of electrolyte facilitate fast diffusion lithium ions during cycling processes. The graphene layer within each nanosheet can act as a mini-current collector, which is favorable electron transport in electrode. As consequence, G-TiO2 exhibit ultrahigh rate...

This paper examines the adsorption of Pb(II) and a natural organic macromolecular compound (humic acid, HA) on polyacrylamide (PAAM) -grafted multiwalled carbon nanotubes (denoted as MWCNTs/PAAM), prepared by an N2-plasma-induced grafting technique. The mutual effects HA/Pb(II) HA MWCNTs/PAAM, well pH, ionic strength, concentrations, addition sequences were investigated. results indicated that strongly dependent pH strength. presence led to strong increase in at low decrease high whereas...

Abstract Micrometer‐sized electrochemical capacitors have recently attracted attention due to their possible applications in micro‐electronic devices. Here, a new approach large‐scale fabrication of high‐capacitance, two‐dimensional MoS 2 film‐based micro‐supercapacitors is demonstrated via simple and low‐cost spray painting nanosheets on Si/SiO chip subsequent laser patterning. The obtained are well defined by ten interdigitated electrodes (five per polarity) with 4.5 mm length, 820 μm wide...

Abstract Metallic 1T MoS 2 is highly desirable for catalyzing electrochemical hydrogen production from water owing to its high electrical conductivity. However, stable difficult be produced in large‐scale by either common chemical or physical approaches. Here, ultrastable in‐plane 1T–2H heterostructures are achieved via a simple one‐pot annealing treatment of 2H bulk under mixture gas Ar and phosphorous vapor, where phosphorus cannot only occupy the interspace bulk, resulting expansion 2,...

Nanographene-constructed hollow carbon spheres (NGHCs) are fabricated using discotic nanographene as a building block and silica/space/mesoporous silica sphere template. The resultant NGHCs exhibit uniform size consist of dual walls. In the exterior walls NGHCs, nanochannels arrange perpendicularly to surface, which is favorable for lithium ion diffusion from different orientations, while interior graphitic solid can facilitate collection transport electrons. show excellent electrochemical...

A bottom-up approach was employed for the large-scale production of 2D graphene-based nanosheets which have a sandwich structure and consist silica, carbon, metal or oxide (see picture). These exhibit many unique features such as large aspect ratio, high surface area, monodispersibility, render them suitable broad application in catalysis, sensors, batteries. Detailed facts importance to specialist readers are published "Supporting Information". Such documents peer-reviewed, but not...

Homogeneous dispersion of ultrafine Pt nanoparticles on 3D architectures constructed graphene and exfoliated graphitic carbon nitride results in hybrids with porous structures, large surface area, high nitrogen content, good electrical conductivity. This leads to excellent electrocatalytic activity, unusually poison tolerance, reliable stability for methanol oxidation, making them interest as catalysts direct fuel cells. As a service our authors readers, this journal provides supporting...

Here, pyridinic nitrogen dominated graphene aerogels with/without iron incorporation (Fe‐NG and NG) are prepared via a facile effective process including freeze‐drying of chemically reduced oxide precursor thermal treatment in NH 3 . A high doping level has been achieved (up to 12.2 at% for NG 11.3 Fe‐NG) with striking enrichment 90.4% the total content NG, 82.4% Fe‐NG). It is found that Fe‐NG catalysts display more positive onset potential, higher current density, better four‐electron...

Various two-dimensional (2D) materials have recently attracted great attention owing to their unique properties and wide application potential in electronics, catalysis, energy storage, conversion. However, large-scale production of ultrathin sheets functional nanosheets remains a scientific engineering challenge. Here we demonstrate an efficient approach for V2O5 having thickness 4 nm utilization as building blocks constructing 3D architectures via freeze-drying process. The resulting...

Abstract The corrosion, passivation, and dendritic growth of Zn anodes the dissolution cathodes hinder rechargeable aqueous zinc ion battery (AZIB) rejuvenation. In this work, a versatile Zn‐based montmorillonite (MMT) interlayer is constructed to achieve stable AZIB. MMT coating foil (MMT‐Zn) designed enable high transference number for 2+ ( t + ≈ 0.82) freeway migration alleviate corrosion passivation suppress dendrites. results show MMT‐Zn symmetrical batteries render dendrite‐free...

Graphene oxide nanosheets have the highest sorption capacities of today's nanomaterials for U(<sc>vi</sc>) ion removal from aqueous solutions.

Abstract A 3D printing approach is first developed to fabricate quasi‐solid‐state asymmetric micro‐supercapacitors simultaneously realize the efficient patterning and ultrahigh areal energy density. Typically, cathode, anode, electrolyte inks with high viscosities shear‐thinning rheological behaviors are prepared printed individually on substrates. The micro‐supercapacitor interdigitated electrodes exhibits excellent structural integrity, a large mass loading of 3.1 mg cm −2 , wide...