Graphene nanosheets were produced in large quantity via a soft chemistry synthetic route involving graphite oxidation, ultrasonic exfoliation, and chemical reduction. X-ray diffraction transmission electron microscopy (TEM) observations show that graphene with sizes the range of tens to hundreds square nanometers ripple-like corrugations. High resolution TEM (HRTEM) selected area (SAED) analysis confirmed ordered crystal structure nanosheets. The optical properties characterized by Raman...

Sphere we go: Monodisperse resorcinol formaldehyde (RF) resin polymer spheres with finely tunable particle size ranging from 200 to 1000 nm (see pictures) are prepared by an extension of the Stöber method. Pyrolysis RF at 600 °C under N2 atmosphere yields uniform carbon a volume shrinkage 19 %. Detailed facts importance specialist readers published as ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted authors. Please note:...

Conjugated polymeric molecules have been heralded as promising electrode materials for the next-generation energy-storage technologies owing to their chemical flexibility at molecular level, environmental benefit, and cost advantage. However, before any practical implementation takes place, low capacity, poor structural stability, sluggish ion/electron diffusion kinetics remain obstacles that be overcome. Here, we report synthesis of a few-layered two-dimensional covalent organic framework...

Rational design and controllable synthesis of TiO2 based materials with unique microstructure, high reactivity, excellent electrochemical performance for lithium ion batteries are crucially desired. In this paper, we developed a versatile route to synthesize hollow TiO2/graphitic carbon (H-TiO2/GC) spheres superior performance. The as-prepared mesoporous H-TiO2/GC present specific surface area (298 m2 g–1), pore volume (0.31 cm3 large size (∼5 nm), well-defined structure (monodispersed 600...

Highly ordered mesoporous MoS2 with a high surface area and narrow pore-size distribution is synthesized by vacuum assisted impregnation route. The demonstrates an expanded d002 spacing of 0.66 nm. electrode achieves excellent rate capacity 608 mAh g−1 at the discharge current 10 A (∼15C), which places as viable next generation power source for electric vehicles.

In this work, we have synthesized highly ordered mesoporous NiO materials by a nanocasting method using silica KIT-6 as the hard templates. Mesoporous particles were characterized small angle X-ray diffraction (XRD), nitrogen adsorption/desorption, and transmission electron microscopy (TEM). The results demonstrated that as-prepared had an Ia3d symmetric mesostructure, with high surface area of 96 m2/g. tested anode material for lithium ion batteries, exhibiting much lower activation energy...

Nanoporous cobalt oxide nanorods were synthesized by a hydrothermal method. Transmission electron microscopy analysis showed that the individual Co3O4 have nanoporous structure, consisting of textured aggregations nanocrystals. Optical properties characterized Raman and UV−vis spectroscopy. Magnetic property measurement shows low Néel transition temperature 35 K. We observed quite significant exchange bias for nanorods, indicating existence magnetic coupling between nanocrystals in nanorods....

Hexagonally ordered mesoporous LiFePO4/C nanocomposites can be synthesised with LiFePO4 nanoparticles embedded in an interconnected carbon framework. Mesoporous exhibit superior electrochemical performance and ultra-high specific power density, which makes this architecture suitable for high applications such as HEVs stationary energy storage smart grids.

Abstract Rechargeable lithium batteries have attracted great attention as next generation power systems for electric vehicles (EVs). Lithium ion batteries, lithium–sulfur and lithium–oxygen are all suitable to be the EVs, but their densities cycling performance still need improved match requirements of practical EVs. Thus, rational design controllable synthesis electrode materials with unique microstructure outstanding electrochemical crucially desired. Porous carbon‐based composites many...

Abstract Potassium metal batteries are considered as attractive alternatives beyond lithium‐ion batteries. However, uncontrollable dendrite growth on the potassium anode has restrained their practical applications. A high‐performance achieved by confining into a titanium‐deficient nitrogen‐containing MXene/carbon nanotube freestanding scaffold is reported. The high electronic transport and fast diffusion in this enable reduced local current density homogeneous ionic flux during...

Graphene-Co₃O₄ composite with a unique sandwich-architecture was successfully synthesized and applied as an efficient electrocatalyst for oxygen evolution reaction. Field emission scanning electron microscopy (FESEM) transmission (TEM) analyses confirmed that Co₃O₄ nanocrystals were homogeneously distributed on both sides of graphene nanosheets. The obtained shows enhanced catalytic activities in alkaline neutral electrolytes. onset potential towards the reaction is 0.406 V (vs. Ag/AgCl) 1 M...

The formation of dendrites on a zinc (Zn) metal anode has limited its practical applications aqueous batteries. Herein, an artificial composite protective layer consisting nanosized metal-organic frameworks (MOFs) to improve the poor wetting effect electrolytes Zn is proposed reconstruct Zn/electrolyte interface. In this layer, hydrophilic MOF nanoparticles serve as interconnecting electrolyte reservoirs enabling nanolevel well regulating flux anode. This zincophilic interface exhibits...

Single-atom catalysts (SACs) have attracted extensive interest to catalyze the oxygen reduction reaction (ORR) in fuel cells and metal-air batteries. However, development of SACs with high selectivity long-term stability is a great challenge. In this work, carbon vacancy modified Fe-N-C (FeH -N-C) are practically designed synthesized through microenvironment modulation, achieving high-efficient utilization active sites optimization electronic structures. The FeH -N-C catalyst exhibits...

Sb₂O₃/MXene(Ti₃C₂T_x) composites with Sb₂O₃nanoparticles confined in the 3D network of Ti₃C₂T_xflakes were fabricated as anodes for Na-ion batteries.

Abstract Nonprecious metal single‐atom materials have attracted extensive attention in the field of electrocatalysis due to their low cost, high reactivity, selectivity, and atomic utilization. However, surface energy a single atom causes agglomeration during preparation catalytic measurement, resulting damage sites. The strong interaction between substrate monoatoms is key factor prevent aggregation individual atoms, geometry electronic structure catalysts can be adjusted optimize activity....

Selenium cathodes have attracted considerable attention due to high electronic conductivity and volumetric capacity comparable sulphur cathodes. However, practical development of lithium-selenium batteries has been hindered by the low selenium reaction activity with lithium, volume changes rapid fading caused shuttle effect polyselenides. Recently, single atom catalysts extensive interests in electrochemical energy conversion storage because unique structural properties, maximum...

Carbon nanotubes (CNTs) and nitrogen-doped carbon (CNx) were synthesized by the floating catalyst chemical vapor deposition (FCCVD) method. Pt nanoparticles deposited onto two supports with ethylene glycol reduction Different from CNTs that contain straight hollow tubes, CNx a bamboolike structure kinks along tubes more surface defects. X-ray photoelectron spectroscopy (XPS) confirms nitrogen atoms in graphite matrix reveals natures of doped atoms. K-edge near-edge absorption fine (NEXAFS)...

Herein, a proof-of-concept of novel hybrid rechargeable battery based on electrochemical reactions both nickel–zinc and zinc–air batteries is demonstrated using NiO/Ni(OH)2 nanoflakes self-assembled into mesoporous spheres as the active electrode material. The operates two sets fundamentally different combined at cell level, unlike in other systems where are simply connected through an external circuitry. As result combining reactions, demonstrates remarkably high power density (volumetric,...

Abstract Garnet‐type solid‐state electrolytes (SSEs) have been widely studied as a promising candidate for Li metal batteries. Despite the common belief that inorganic SSEs can prevent dendrite propagation, garnet suffer from relatively low critical current density (CCD) at which are abruptly short‐circuited by dendrites. In this study, short‐circuiting mechanism of 7 La 2.75 Ca 0.25 Zr 1.75 Nb O 12 (LLCZN) is investigated. It found instead propagating uniaxially one electrode to other in...