The AC impedance response of mixed ionic and electronic conductors (MIECs) is derived from first principles quantitatively compared with experimental data. While the approach not entirely new, derivation provided in a unified comprehensive manner. Using Sm 0.15 Ce 0.85 O 1.925–δ Pt electrodes as model system, broad spectrum electrical thermodynamic properties extracted solely measurement spectra over wide oxygen partial pressure temperature ranges. Here, was varied air [ p o 2 =0.21 atm] to...

The intercalation pathway of lithium iron phosphate (LFP) in the positive electrode a lithium-ion battery was probed at ∼40 nm length scale using oxidation-state-sensitive X-ray microscopy. Combined with morphological observations same exact locations transmission electron microscopy, we quantified local state-of-charge approximately 450 individual LFP particles over nearly entire thickness porous electrode. With charged to 50% 0.5 h, observed that overwhelming majority were either almost...

Some of the best thermoelectrics are complex materials with rattling guests inside oversized atomic cages. Understanding chemical and structural origins behavior is essential to design thermoelectric materials. In this work, a clear connection established between local bonding asymmetry anharmonic modes in tetrahedrite thermoelectrics, enabled by chemically active electron lone pairs. The studies reveal five‐atom cage Sb[CuS 3 ]Sb Cu 12 Sb 4 S 13 tetrahedrites that exhibits strong asymmetry:...

Monolithic cathodes of optimized porosity prepared by sintering LiCoO2 powders provide high volume utilization and surprising stability under electrochemical cycling. Combined with a novel packaging approach, ultrahigh energy densities in small volumes are enabled. The microbatteries have <6 mm3 sustained ∼2.5 h discharges 400–650 W L−1. Detailed facts importance to specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They...

Lithium garnet oxides of the composition series Li7−xLa3Zr2−xTaxO12 (x = 0−2) were synthesized by solid state reaction and characterized powder X-ray diffraction impedance spectroscopy. Single cubic phases obtained between x 0.2 2, while end-member Li7La3Zr2O12 exhibited a tetragonal phase. The lattice parameters followed Vegard's law. maximum bulk (9.6 × 10−4 S/cm) total (6.9 conductivities achieved at 0.3 0.2, respectively room temperature. Electrochemical tests with hybrid solid|liquid...

The solubility of selenium on the sulfur site in tetrahedrite Cu12Sb4S13 has been investigated by theoretical calculations, and results have verified X-ray diffraction synchrotron studies Cu12Sb4S13–xSex with x ranging from zero to 3. Density-functional theory calculations predict that Se substitution tetrahedral 24g is preferred, this found be consistent Rietveld refinement crystal structure. High temperature thermoelectric property measurements Cu12Sb4S13-xSex reveal a decrease electrical...

Electrolysis of seawater can not only desalinate but also produce high-purity hydrogen. Nevertheless, the presence chloride ions in will cause electrode corrosion and undergo a chlorine oxidation reaction (ClOR) that competes with oxygen evolution (OER). Therefore, highly efficient long-term stable electrocatalysts are needed this field. In work, an advanced bifunctional electrocatalyst based on NiFe layered double hydroxide (LDH)/FeOOH heterostructure nanosheets (NiFe LDH/FeOOH) was...

A flame-retardant single-ion conducting polymer electrolyte was constructed by incorporating allylboronic acid pinacol ester into the 3D network to trap anions, leading unity lithium-ion transference number and high ionic conductivity.

Bimetallic materials have been regarded as promising catalysts for efficient alkaline water splitting. However, the spontaneous reconstruction of surface structures before catalysis has long overlooked. Here, we present that in situ dissolution MoO42- CoMoO4 boosts an medium. Our results reveal microrod arrays function precatalysts undergo under conditions, forming a layer Co3O4/CoMoO4 and CoOOH/CoMoO4 heterostructures. X-ray photoelectron spectroscopy (XPS) combined with Raman reveals such...

The development of an efficient and low-cost electrocatalyst for oxygen evolution reaction (OER) is the key to improving overall efficiency water electrolysis. Here, we report design a three-dimensional (3-D) heterostructured Ni9S8/Ni3S2 precatalyst composed unstable Ni9S8 inert Ni3S2 components, which undergoes in situ electrochemical activation generate amorphous-NiOOH/Ni3S2 catalyst. In Raman spectroscopy combined with ex characterizations, such as X-ray diffraction, photoelectron...

Li-metal batteries (LMBs), especially in combination with high-energy-density Ni-rich materials, exhibit great potential for next-generation rechargeable Li batteries. Nevertheless, poor cathode–/anode–electrolyte interfaces (CEI/SEI) and hydrofluoric acid (HF) attack pose a threat to the electrochemical safety performances of LMBs due aggressive chemical reactivities high-Ni metallic Li, carbonate-based electrolytes LiPF6 salt. Herein, carbonate electrolyte based on is formulated by...

Abstract LiPF 6 ‐based carbonate electrolytes have been extensively employed in commercial Li‐ion batteries, but they face numerous interfacial stability challenges while applicating high‐energy‐density lithium‐metal batteries (LMBs). Herein, this work proposes N‐succinimidyl trifluoroacetate (NST) as a multifunctional electrolyte additive to address these challenges. NST could optimize Li + solvation structure and eliminate HF/H 2 O the electrolyte, preferentially be decomposed on Ni‐rich...

Under the background of "carbon neutral", lithium-ion batteries (LIB) have been widely used in portable electronic devices and large-scale energy storage systems, but current commercial electrolyte is mainly liquid organic compounds, which serious safety risks. In this paper, a bilayer heterogeneous composite solid-state (PLPE) was constructed with 3D LiX zeolite nanofiber (LiX-NF) layer in-situ interfacial layer, greatly extends life span lithium metal (LMB). LiX-NF not only offers...

To better understand the ionic conduction in lithium garnet oxides, we employed molecular dynamics simulation to investigate local structure and of a model material Li7La3Zr2O12 origin its tetragonal cubic phase transition. Our simulations were able produce lattice parameter, neutron scattering, conductivity data close those gathered using experimental techniques, which allows us study atomic-scale details this complex material. First, it was found that atoms primarily perform oscillation...

In this paper, we demonstrate the electrochemical properties of a P2-type layered oxide, Nax(Ni2+)1/3(Ti4+)2/3O2 (x = 2/3), as "bi-functional" electrode material for room temperature, non-aqueous Na-ion batteries. Making use high-voltage redox couple Ni2+/Ni3+ or low-voltage Ti4+/Ti3+, substantiate Na2/3Ni1/3Ti2/3O2 can function either cathode with an average voltage 3.7 V and 75 mAh/g at C/20 anode 0.7 C/20. The cathodic displays reversible sodium insertion/extraction but has lower rate...

A facile method for the assembly of polyaniline/graphene oxide (PANi/GO) composite hydrogel has been successfully demonstrated by in‐situ polymerization aniline in presence phytic acid with aid GO. During aniline, 2D GO nanosheets can regulate aggregation state polymer and prompt formation hydrogel. The chemical structure, morphology mechanical property are investigated Fourier transform infrared spectroscopy, X‐ray diffraction, scanning electron microscopy compressive stress–strain...