In this work, we have successfully grown single-crystalline nanoneedle arrays of NiCo2O4 on conductive substrates such as Ni foam and Ti foil through a simple solution method together with post-annealing treatment. Remarkably, the NiCo2O4–Ni binder-free electrode exhibits greatly improved electrochemical performance very high capacitance excellent cycling stability.

Novel ZnMn2O4 ball-in-ball hollow microspheres are fabricated by a facile two-step method involving the solution synthesis of ZnMn-glycolate and subsequent thermal annealing in air. When evaluated as an anode material for lithium-ion batteries, these show significantly enhanced electrochemical performance with high capacity, excellent cycling stability good rate capability. Detailed facts importance to specialist readers published ”Supporting Information”. Such documents peer-reviewed, but...

Hollow hierarchical spheres self-organized from the ultrathin nanosheets of α-Fe2O3 were prepared by a simple process. These nanosheet subunits possess an average thickness around 3.5 nm and show preferential exposure (110) facets. Their Li ion storage visible-light photocatalytic water oxidation performance are tested. Such nanostructures high properties with good cycling stability excellent rate capabilities. The catalytic activity is 70 μmol h−1 g−1 for O2 evolution under visible light...

The activities of different types PtRu catalysts for methanol oxidation are compared. Materials used were: UHV-cleaned alloys, UHV-evaporated Ru onto Pt(111) as well adsorbed on prepared with and without additional reduction by hydrogen. Differences in the catalytic activity observed to depend preparation procedure catalysts. dependence respective upon surface composition is reported. UHV−STM data Pt(111)/Ru show formation two- three-dimensional structures depending coverage. A molecular...

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...

Nanomaterials as anode for lithium-ion batteries (LIB) have gained widespread interest in the research community. However, scaling up and processibility are bottlenecks to further commercialization of these materials. Here, we report that bulk antimony sulfide with a size 10–20 μm exhibits high capacity stable cycling 800 mAh g−1. Mechanical chemical stabilities electrodes ensured by an optimal electrode-electrolyte system design, polyimide-based binder together fluoroethylene carbonate...

A facile thermal decomposing method has been developed for the fabrication of CoxP nanostructures with controlled size, phase, and shape (e.g., Co2P rod spheres, CoP hollow solid particles). An amorphous carbon layer could be introduced by carbonization organic surfactants from precursors. The electrochemical performance typical samples as anode materials investigated nanoparticle coating depicts good capacity retention high rate capability specific 630 mA h g–1 at 0.2 C after 100 cycles, a...

One-dimensional hierarchical hollow nanostructures composed of NiO nanosheets are successfully synthesized through a facile carbon nanofiber directed solution method followed by simple thermal annealing treatment. With the advantages high electro-active surface area, supported robust structure and short ion electron transport pathways, hybrid deliver largely enhanced capacitance with excellent cycling stability when evaluated as electrode materials for supercapacitors. More specifically, 642...

Hierarchical Cu doped vanadium pentoxide (V2O5) flowers were prepared via a simple hydrothermal approach followed by an annealing process. The flower precursors are self-assembled with 1D nanobelts surrounding central core. morphological evolution is investigated and plausible mechanism proposed. As the cathode material for lithium ion batteries, V2O5 samples exhibit improved electrochemical performance compared to un-doped ones. Among them Cu0.02V1.98O5 delivered higher reversible specific...

A facile two-step strategy involving a polyol method and subsequent thermal annealing treatment is successfully developed for the general synthesis of metal oxide/carbon coaxial nanocables. Benefitting from strong coupling effect, these hybrid nanocables exhibit remarkable lithium storage properties with high capacity, long cycle life excellent rate capability.

Due to its potential cost advantage, sodium ion batteries could become a commercial alternative lithium batteries. One promising cathode material for this type of battery is layered manganese oxide. In investigation we report on the influence morphology cycle performance NaxMnO2+z. Hollow spheres NaxMnO2+z with diameter ∼5 μm were compared flake-like It was found that electrochemical behavior both materials as measured by cyclic voltammetry comparable. However, stability significantly...

The activity of different types PtRu surfaces towards anodic methanol oxidation has been investigated. As expected the Pt(111) modified with Ru and analyzed in a UHV environment depends on total number Pt–Ru pair sites. Their population can be increased by artificially creating additional surface defects before or after ruthenium deposition. Ruthenium alloyed into smooth terraces turn does not lead to comparable electrocatalytic activity, moreover current density under potentiostatic...

Ternary metal oxides have been receiving wide attention in electrochemical energy storage due to their rich redox reactions and tuneable conductivity. We present a simple solution-based method prepare 3D interconnected porous network of ternary oxide (CoMoO4 ZnCo2O4) nanostructures on macroporous nickel foam. The open-structured networks with different degrees porosity endow them high surface areas electro-active sites. Li ion properties both anodes are investigated. High rate capability...

Abstract We report on the first year of calendar ageing commercial high‐energy 21700 lithium‐ion cells, varying over eight state charge (SoC) and three temperature values. Lithium‐nickel‐cobalt‐aluminium oxide (NCA) graphite with silicon suboxide (Gr‐SiO x ) form cathodes anodes those respectively. Degradation is fastest for cells at 70–80 % SoC according to monthly electrochemical check‐up tests. Cells kept 100 do not show capacity fade but develop internal short circuits temperatures T ≥40...

More lithium disorder is present in meta-stable AA-stackings during delithiation.

Cell temperature of hard carbons is varied under open circuit conditions (entropy profiling) during sodiation. Features vary with pore size, revealing the nanopore filling onset. Sodium binding energy scales inversely curvature radius.

Smooth ultrahigh vacuum-cleaned PtRu alloys used as model catalysts for methanol oxidation, present a continuous loss of activity under potentiostatic conditions. After potential step, e.g., from 50 to 500 mV vs. reference hydrogen electrode, chronoamperometric curves first show steep decrease over 5-10 min followed by slower several hours. The latter decay exhibits time−1 behavior different catalyst compositions, with higher slopes the less activity. current can be repeatedly observed...

We report on the structure and electrochemical adsorption properties of well-defined pseudomorphic Pt mono- multilayers Ru(0001). These act as model surfaces for Pt(111) with slightly decreased affinity to adsorbed hydrogen (H(ad)) hydroxyl (OH(ad)). In cyclic voltammograms, this is reflected in more negative/positive potential regions reversible upd-H(ad)/OH(ad), respectively, compared Pt(111). For upd-H(ad), we show that corresponding trends can be predicted high accuracy by density...

A bisterpyridine based molecule, 3,3′-BTP, shows a variety of adlayer structures at the interface between highly oriented pyrolytic graphite (HOPG) and liquid depending on concentration in solution. Three closely related linear one hexagonal 2D patterns are found. Comparison with self-assembly HOPG|gas that absence solvent can be The dependent order appearance different surface is rationalized by thermodynamic model. In unit cell, phase offers central void which mostly filled seventh...

Structure formation in an ionic liquid adlayer: First molecularly resolved scanning tunneling microscopy images of adlayer ([Py1,4]+ [FAP]− (see image)), evaporated on a Au(111) surface, resolve molecular pattern at 210 K with distinct short range order, indicating 2D solid, while room temperature, the mobility is too high to features, as expected for liquid.