Organic solution-processable graphene sheets were prepared using a large-scale novel approach based on transfer process assisted by ionic interactions. Smooth monolayer easily fabricated substrate from organic solution. Such noncovalent functionalization preserves the extended aromatic conjugation of reduced sheets, giving rise to high-conductivity cast films.

A Co(OH)2/zeolite nanocomposite with an extraordinarily high specific capacitance is described. Nanometer-sized Co(OH)2 whiskers on the zeolite surface permit electrochemical accessibility and a fast diffusion rate of electrolyte through material, resulting in approaching theoretical limit. Increasing loading increases whisker growth (see Figure), until bulk begins to nucleate grow solution (arrows).

Even though Fe-N/C electrocatalysts with abundant Fe-Nx active sites have been developed as one of the most promising alternatives to precious metal materials for oxygen reduction reaction (ORR), further improvement their performance requires precise control over at molecular level and deep understanding catalytic mechanism associated each particular structure. Herein, we report a host–guest chemistry strategy construct Fe-mIm nanocluster (NC) (guest)@zeolite imidazole framework-8 (ZIF-8)...

Metal organic framework (MOF)‐derived nitrogen‐enriched nanocarbons have been proposed as promising metal‐free electrocatalysts for oxygen reduction reaction. However, the characteristic microporous feature of MOF‐derived carbon determined by MOF structure significantly hinders mass transfer and exposure active sites, resulting in unsatisfactory electrocatalytic performance. Here an situ confinement pyrolysis strategy that can simply but efficiently transform monodisperse ZIF‐8 polyhedrons...

A transition-metal-nitrogen/carbon (TM-N/C, TM = Fe, Co, Ni, etc.) system is a popular, nonprecious-metal oxygen reduction reaction (ORR) electrocatalyst for fuel cell and metal-air battery applications. However, there remains lack of comprehensive understanding about the ORR electrocatalytic mechanism on these catalysts, especially roles different forms metal species performance. Here, novel CuN/C with hybrid Cu coordination site successfully fabricated simple but efficient...

The charge redistribution strategy driven by heteroatom doping or defect engineering has been developed as an efficient method to endow inert carbon with significant oxygen reduction reaction (ORR) activity. synergetic effect between the two approaches is thus expected be more effective for manipulating distribution of materials exceptional ORR performance. Herein we report a novel molecular design achieve 2D porous turbostratic nanomesh abundant N-doped defects (NDC). level integration...

Abstract One‐dimensional fibers and tubes are constructed through the oriented carbon‐carbon cross‐linking reactions towards rigid conjugated polymer networks. As result, a template‐free one‐step synthesis of CNTs CNFs is achieved simple carbonization as‐formed carbon‐rich tubular fiberlike polyphenylene precursors under argon. Microporous with surface area up to 900 m 2 g –1 obtained, together HR‐TEM characterizations indicating formation intrinsic microporous structure in these The primary...

Metal and metal oxide nanocrystals have sparked great interest due to their excellent catalytic, magnetic, electronic properties. Particularly, the integration of metallic one-dimensional (1D) electronically conducting carbons form metal−carbon hybrids can lead enhanced physical chemical properties or even creation new with respect single component materials. However, direct access thermally stable structurally ordered 1D remains a primary challenge. We report an in situ fabrication Co3O4 Pt...

Abstract Designing rational nanostructures of metal–organic frameworks based carbon materials to promote the bifunctional catalytic activity oxygen reduction reaction (ORR) and evolution (OER) is highly desired but still remains a great challenge. Herein, an in situ growth method achieve 1D structure‐controllable zeolitic imidazolate (ZIFs)/polyacrylonitrile (PAN) core/shell fiber (PAN@ZIFs) developed. Subsequent pyrolysis this precursor can obtain heteroatom‐doped nanofiber network as...

Homogeneous ZnCo₂O₄ nanoflowers have been synthesized on a 3D layered structure of carbon nanotubes/nitrogen-doped graphene (NGN/CNTs) film by hydrothermal process and subsequent calcination method.

Developing porous carbon-based non-precious-metal catalysts for an oxygen reduction reaction (ORR) is a suitable approach to significantly reduce the costs of fuel cells or metal-air batteries. Herein, interconnected hierarchically carbon nanofibers simultaneously doped with nitrogen and iron (HP-Fe-N/CNFs) were fabricated by facile pyrolysis polypyrrole-coated electrospun polystyrene/FeCl3 fibers. The obtained have high specific surface area (569.6 m2/g) large pore volume (1.00 cm3/ g) as...

Transparent and highly conductive graphene electrodes have been fabricated through acetylene-assisted thermolysis of graphite oxide (GO) sheets. This novel procedure uses acetylene as a supplemental carbon source to repair substantial defects within GO sheets, leading the enhancement graphitization synthesized electrodes. The as-prepared on quartz substrates exhibits an electrical conductivity 1425 S cm−1 with optical transmittance more than 70% at wavelength 500 nm. Such thermal treatment...

A novel electrode material based on graphene oxide (GO)-polypyrrole (PPy) composites was synthesized by in situ chemical oxidation polymerization. Palladium nanoparticles (NPs) with a diameter of 4.0 nm were loaded the reduced oxide(RGO)-PPy microwave-assisted polyol process. Microstructure analysis showed that layer coated PPy film monodisperse Pd NPs is present RGO surface. The Pd/RGO-PPy catalysts exhibit excellent catalytic activity and stability for formic acid electro-oxidation when...

A novel approach towards highly conductive free-standing chemically reduced graphene/carbon nanotube composite films via an in situ thermolysis of functionalized graphene/organic cobalt complexes was developed. By combining 1D-CNT and 2D-graphene, a synergistic effect conductivity established.

On the basis of a special synergized dual-catalysis mechanism, this work reports preparation BiOI-based heterojunction and its use for cathodic photoelectrochemical (PEC) oxidase biosensing, which, unexpectedly, revealed that hydrogen peroxide (H2O2) had greater impact than dioxygen (O2). Specifically, BiOI layer was in situ formed on substrate through an impregnating hydroxylation method following coupling with model enzyme glucose oxidases (GOx). The constructed PEC sensor exhibited good...

Platinum (Pt)-based electrocatalysts supported by reduced graphene oxide (RGO) were synthesized using two different methods, namely: (i) a conventional two-step polyol process RGO as the substrate, and (ii) modified implicating simultaneous reduction of Pt nanoparticle precursor (GO). The structure, morphology, electrochemical performances obtained Pt/RGO catalysts studied compared with reference Pt/carbon black Vulcan XC-72 (C) sample. It was shown that optimized had higher utilization...

To facilely prepare high-performance Fe-N/G oxygen reduction catalysts via a simple and controllable route from available low-cost materials is still challenge. Herein, we develop an in situ self-sacrificed template strategy to synthesize melamine, glucose, FeSO4·7H2O. Fe/Fe3C@graphitic carbon nanocapsules are uniformly formed on the NG surface create highly opened stable mesoporous framework structure. Furthermore, effectively doped N sites high active Fe-Nx synchronously constructed such...

This work reports the synthesis, characterization, and application of bifunctional semiconducting CuO nanotubes (NTs) electrode for innovative synergized cathodic photoelectrochemical (PEC) enzymatic bioanalysis. Specifically, NTs was fabricated by surface oxidation copper foil in an alkaline aqueous solution with (NH4)2S2O8 then annealed air at 200 °C. After subsequent coupling model enzyme xanthine oxidase (XOD), resulted photocathodic biosensor exhibited good analytical performance rapid...

A novel nano-composite material of Ni(OH)2/USY was prepared in our lab. This nanostructure creates electrochemical accessibility electrolyte OH- ions to Ni(OH)2 thin layers and a fast diffusion rate within the redox phase.