3D porous graphitic biomass carbon as advanced supercapacitor electrode materials synthesized by a low-cost and effective one-step method.

Controlling the growth of high-activity anatase TiO2 exposed {001} facets improves greatly adsorption and electronic photocatalytic properties has been attractive for various environmental energy-related applications. In this paper, we introduced a novel approach quantitatively measuring percentage in by using Raman spectroscopy. Comparing to XRD, peaks originate from vibration molecular bonds, that is, vibrational mode Eg A1g peaks, which are related different crystal planes. Therefore, it...

This paper introduces a novel method for characterizing the oxygen vacancy associates in hydrogenation-modified TiO2 by using positron annihilation lifetime spectroscopy (PALS). It was found that huge number of small neutral Ti3+–oxygen associates, some larger size clusters, and few voids were introduced into hydrogenated TiO2. The defects blurred atomic lattice high-resolution transmission electron microscopy (HRTEM) images brought about emergence new Raman vibration. X-ray photoelectron...

The influence of variant graphenes on electrochemical performance for supercapacitors was studied comparatively and systematically by using SEM, FTIR Raman spectroscopy, cyclic voltammetry (CV), galvanostatic charge/discharge impedance spectroscopy (EIS). results revealed that: 1) the nitrogen-doped graphene (N-G) electrode exhibited highest specific capacitance at same voltage scan rate; 2) N-G reached up to 243.5 F/g 1 A/g, while regular graphite oxide (GO) 43.5 reduced (rGO) 67.9 F/g; 3)...

Recently, research on graphene based photodetectors has drawn substantial attention due to ultrafast and broadband photoresponse of graphene. However, they usually have low responsivity photoconductive gain induced by the gapless nature graphene, which greatly limit their applications. The synergetic integration with other two-dimensional (2D) materials form van der Waals heterostructure is a very promising approach overcome these shortcomings. Here we report growth graphene-Bi2Te3 where...

Black phosphorus (BP) is a very promising material for telecommunication due to its direct bandgap and strong resonant absorption in near‐infrared wavelength range. However, ultrafast nonlinear photonic applications relying on the photocarrier dynamics as well optical nonlinearity black remain unexplored. In this work, properties of solution exfoliated BP are investigated usage new saturable absorber high energy pulse generation fiber laser demonstrated. order avoid oxidization degradation,...

In this work, a novel photocatalyst, polypyrrole (PPy)-decorated Ag-TiO2 nanofibers (PPy-Ag-TiO2) with core–shell structure, was successfully synthesized using an electrospinning technique, followed by surfactant-directed in situ chemical polymerization method. The results show that PPy layer formed on the surface of nanofiber, which is beneficial for protecting Ag nanoparticles from being oxidized. Meanwhile, PPy-Ag-TiO2 system exhibits remarkable light absorption visible region and high...

This paper shows a new classification of preparing biomass-based porous carbon materials. The design high-performance materials and their recent progress in the field supercapacitors are reviewed.

Abstract Molybdenum disulphide (MoS 2 ), which is a typical semiconductor from the family of layered transition metal dichalcogenides (TMDs), an attractive material for optoelectronic and photodetection applications because its tunable bandgap high quantum luminescence efficiency. Although photoresponsivity 880–2000 AW −1 photogain up to 5000 have been demonstrated in MoS -based photodetectors, light absorption gain mechanisms are two fundamental issues preventing these materials further...

In the present work, a novel method for synthesizing one-dimensional CuO nanoneedle array was introduced; that is, first, pure copper nanocrystalline layer plated by using periodic reverse pulse plating process, and then grew upon through thermal oxidation in air. The nanoneedles were characterized scanning electron microscopy, regular high-resolution transmission microscopies, X-ray diffraction, photoelectron spectroscopy, analysis system (thermogravimetry differential calorimetry). results...

In this study, C3N4@Ag-Bi2WO6 with flower-like architecture was successfully prepared through a facile process. The particles 2–4 μm diameters present remarkable enhanced visible light absorption and electron–hole separation efficiency. Compared Bi2WO6, Ag-Bi2WO6, C3N4@Bi2WO6 systems, the system exhibits optimal photocatalytic activities in both degradation of RhB hydrogen production out water under irradiation. We propose that these results are attributed to synergy effects Ag, g-C3N4,...

Abstract This paper introduced a process to prepare the carbon nanosphere (CNS)/NiCo 2 O 4 core-shell sub-microspheres. That is: 1) CNSs were firstly prepared via simple hydrothermal method; 2) layer of NiCo precursor was coated on CNS surface; 3) finally composite annealed at 350 °C for hours in air and CNS/NiCo sub-microspheres obtained. sub-microsphere with simple, economical environmental-friendly method suitable large-scale production, which expects promising electrode candidate high...

The photocatalytic activity of TiO2 is enhanced mainly through heightening absorption UV−vis light and improving the separation efficiency photoinduced electrons holes. recent new theoretical research revealed that codoped with Mo + C considered to be an optimal doping system. On basis this theory, powders were first experimentally synthesized by thermal oxidizing a mixture TiC MoO3 in air. XRD patterns XPS survey spectrum showed carbon (C) acted as Ti−O−C band structure molybdenum (Mo)...

TiO2 is the most investigated photocatalyst because of its nontoxicity, low cost, chemical stability, and strong photooxidative ability. Because morphology- structure-dependent photocatalytic properties TiO2, accurate characterization crystal electronic structures TiO2-based materials their performance during process crucial not only for understanding mechanism but also providing experimental guidelines as well a theoretical framework synthesis high photocatalysts. In this review, we focused...

Abstract In this work, a novel carbon nanotubes (CNTs)/NiCo 2 S 4 composite for high performance supercapacitors was prepared via simple chemical bath deposition combined with post-anion exchange reaction. The morphologies and phase structures of the composites were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy (Raman), photoelectron (XPS) low-temperature sorption nitrogen (BET). electro-chemical tests revealed that CNT/NiCo exhibited...

Supercapacitor electrodes based on carbonaceous materials with hierarchical porosity and localized graphitic structure can help supercapacitors to achieve considerable energy capacity. In this work, chitosan-derived hierarchically porous carbon (CS-HPGC) nitrogen self-doping was synthesized via a simple green approach using potassium ferrate (K2FeO4). Different from conventional templating or two-step strategies, method allows the accomplishment of carbonization, graphitization, heteroatom...

This paper introduced a novel physical route which combined pulse electrodeposition with thermal oxidation to obtain porous micro–nano-structure NiO/ZnO heterostructural composite. Because ZnO nanoneedle directly grew from the Ni foam or NiO surface, and was accompanied short-range atom interdiffusion at interface between NiO, heterojunction formed exhibited high interfacial adhesion strength density. The experimental results revealed this composite had excellent photocatalytic performance,...

Currently, the MXene-based flexible supercapacitors have caused much attention due to their excellent mechanical performance and novel electrical property. However, aggregation rearrangement of MXene nanosheets in process electrode preparation limit electrochemical performance. Herein, a kind MXene/N-doped carbon foam (MXene/NCF) compressible composite with three-dimensional (3D) hollow interconnected neuron-like architecture is directly prepared by one-step pyrolysis used for freestanding,...

Anatase TiO2 nanocrystals with internal pores are prepared by a novel facile microwave-assisted hydrolysis of mixture TiOCl2 and HF aqueous solutions, followed calcination at 400 °C. The characterized XRD, TEM, SEM, BET, EDS, XPS. formation mechanism the is discussed investigating role fluorine calcination. photocatalytic measurement shows that exhibit much higher activity for photodegradation crystal violet, methyl orange, 4-chlorophenol than solid nanocrystals. enhancement due to...

Sensitivity, durability, and multifunction are the essential requirements for a high-performance wearable sensor. Here, we report novel multifunctional sensor with high sensitivity durability by using buckled spider silk-like single-walled carbon nanotubes (SSL-SWNTs) film as conducting network crack-shaped Au sensitive transducer. Its is inspired structure of spider's slit organs, while mechanical robustness silk. Similar to organs that can detect slight vibrations, our also exhibits...

In this paper, we report an electrical conductivity enhanced copper/graphene composite based on high-quality graphene (HQG) <italic>via</italic> processes involving graphene-coated copper powders through ball milling, and subsequent spark plasma sintering (SPS).

Efficient electrocatalysts for hydrogen evolution reaction (HER) are urgently required to produce renewable clean H2 fuel. However, developing low-cost, highly active, stable, and pH-universal HER catalysts remains a big challenge. Here, facile solution route is carried out construct single-atom tungsten-doped CoP nanoarrays (W-CoP) from metal organic frameworks, which can be directly used as binder-free, high-activity, robust electrocatalyst toward HER. The W-CoP shows competitive...