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The photocatalytic activity of titania nanoparticles deposited on epitaxial graphene is proven to be significantly affected by the substrate on which graphene is supported. In particular, it has been revealed that the addition of a two-dimensional TiO 1.5 layer sandwiched between graphene and the supporting metal induces a p-doping of graphene itself and a consistent shift in the Ti d states. These...
Perovskite solar cells (PSCs) have rapidly achieved a remarkable power conversion efficiency (PCE). However, the inherent instability of components has impeded industrialization. Here we employed atomically-thin impermeable graphene (3 layers) as an interfacial barrier for moisture, I − ion, and Au diffusion. A new graphene transfer method was developed, and the position was carefully optimized between...
Given the efficiency, stability and sustainability, the carbon-based materials have become one of promising bifunctional electrocatalysts to the electrochemical water splitting, involving hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). However, there are still many challenges about the design and mechanism study of the carbon-based electrocatalysts. In this paper, we reported...
The quick improvement of up-to-date communication technology has generated ubiquitous electromagnetic wave (EMW), which poses a significant hazard to environment and human health. One of the key challenges associated with EMW is to develop highly lightweight and efficient adsorption materials that are able to alleviate the unfavorable interferences in wide-ranging frequency. Herein, we fabricated...
High-performance lithium-ion batteries (LIBs) and sodium-ion battery (SIBs) anode materials Co 3 S 4 –ZnS/NC are prepared by carbonization and subsequent sulfidation using Co, Zn-based zeolitic imidazolate frameworks (ZIF) as a precursor. ZnS and Co 3 S 4 in-situ doping on polyhedral carbon framework, which enhances the conductivity and can buffer the volume expansion during the cycle and improve...
We report the first experimental measurement on the thermal conductivity of strained monolayer graphene using optothermal Raman method. Biaxial tensile strain was achieved by applying a pressure difference across suspended monolayer graphene membranes. Experimental results demonstrate that, under 0.12%–0.27% strains, the in-plane thermal conductivity of monolayer graphene is sensitive to the applied...
With the development of portable and flexible electronic devices, demends for high-performance thermal management materials with high thermal conductivity and electrical insulation are growing. Recently, graphene fluoride has received numerous attention from science community due to its high thermal conductivity and electrical insulation. Here, we report an advanced exfoliated graphene fluoride (EGF)...
Silicon (Si) is considered to be one of the alternative anode candidates for lithium-ion batteries due to the high theoretical capacity. Enhancing the columbic efficiency, cycle stability, alleviating the pulverization and decreasing the manufacturing cost are the major challenges that procrastinate the commercialization of Si anode. Inspirited by spiderweb structure, the Si nanoparticles (SiNPs)...
Surface functionalization has been shown to allow tailoring of graphene lattice thus making it suitable for different applications like sensing, supercapacitance devices, drug delivery system and memory devices. In this work, surface functionalization of epitaxial graphene on SiC (EG/SiC) was done by ion beam technology (30 keV Ag − ions at fluences ranging from 5 × 10 12 ions/cm 2 to 5 × 10 14...
Despite recent literature reporting the remarkable electrochemical CO 2 reduction reaction (CO2RR) performance of nitrogen-doped graphitic carbon materials (sp 2 -carbon) and nitrogen-doped diamond materials (sp 3 -carbon), no systematic studies have been conducted on the catalytic activities of hybrid carbon nanomaterials between diamond and graphitic extremes. In this study, nitrogen-doped ultra-nanocrystalline...
Organic cathode materials are drawing increasing attention in lithium-ion battery for their abundance, environmental friendliness, high specific capacity, low cost, and flexibility. But their application has been hindered by poor electrochemical performance because of inherent low conductivity and high solubility in the polar organic electrolyte. Herein, an organic-inorganic composite by impregnating...
Research on internal three-dimensional (3D) strain evolution of a failure process was conducted on a short carbon fiber-reinforced composite through high-resolution (0.33 μm/pixel) in situ synchrotron radiation X-ray computed tomography. Material microstructure and strain value were analyzed simultaneously in 3D for the first time. The distribution of strain fields is nonuniform under load sequences...
Redox flow batteries represent a remarkable alternative for grid-scale energy storage. They commonly employ carbon felts or carbon papers, which suffer from low activity towards the redox reactions involved, leading to poor performance. Here we propose the use of electrospun freestanding carbon materials derived from lignin as alternative sustainable electrodes for all-vanadium flow batteries. The...
Carbon nanotube (CNT)-copper nanocomposites are promising materials for light-weight high-ampacity conductors. The key issue in hybridization of CNT and metal is creating a strong bonding between them. This requires proper modification of the CNT surface. However, experimental works on determining the effect of interfacial functionalization on the properties of the metal/CNT system is scarce. In this...
Soft thermal interface materials (TIMs) are essential components for the thermal management of electrical and mechanical devices. However, the low thermal conductivity (κ) still limits efficient heat dissipation. Here we achieve a record high κ (101.7 W m −1 K −1 ) among soft isotropic TIMs, mediated by the covalent bonding between hydroxyl groups of multiwalled carbon nanotubes (MWNTs) and ester...
Graphene is an excellent candidate for a transparent electrode since it has high lateral conductivity and optical transparency, but due to its high work function, between 4.5 and 5eV, it can serve as a good transparent anode but poor transparent cathode due to a barrier for electrons injection. Reducing graphene’s work function is thus essential to make it an ideal transparent cathode as well. Naturally,...
Flexible fiber-shaped microelectrode biosensors have aroused intensive attention due to the promising use for monitoring personal healthcare. However, challenges still exist in the pursuit of combination of high sensitivity and selectivity. Herein, a facile and effective strategy to solve these problems was proposed by developing a novel fiber-shaped photoelectrochemical urea biosensor (PUB) based...
Using biomass materials as exfoliating agents to produce graphene is a promising strategy due to their biocompatibility, reproducibility and sustainability. However, it’s still a challenge to prepare high-concentration graphene dispersion using biomass exfoliating agents. Here, we present a green and facile method to prepare few layered graphene nanosheets in aqueous solution by one-pot ball milling...
Construction of asymmetric supercapacitors with high energy and power densities using the same anode and cathode electrodes remains a great challenge. Herein, holey reduced graphene oxide (rGO) films are synthesized using a catalytic etching process and utilized as both cathode and anode electrodes for the supercapacitor construction. On the anode of an asymmetric supercapacitor, an electrical double...
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