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Weak Dispersion of Exciton Landé Factor with Band Gap Energy in Lead Halide Perovskites: Approximate Compensation of the Electron and Hole Dependences
(2024)SmallThe optical properties of lead halide perovskite semiconductors in vicinity of the bandgap are controlled by excitons, so that investigation of their fundamental properties is of critical importance. The exciton Land & eacute; or g-factor g(X) is the key parameter, determining the exciton Zeeman spin splitting in magnetic fields. The exciton, electron, and hole carrier g-factors provide information on the band structure, including its ...Journal Article -
Dark-Bright Exciton Splitting Dominates Low-Temperature Diffusion in Halide Perovskite Nanocrystal Assemblies
(2024)Advanced Energy MaterialsSemiconductor nanocrystals can replace conventional bulk materials completely in displays and light-emitting diodes. Exciton transport dominates over charge carrier transport for materials with high exciton binding energies and long ligands, such as halide perovskite nanocrystal films. Here, how beneficial superlattices - nearly perfect 3D assemblies of nanocrystals - are to exciton transport is investigated. Surprisingly, the high degree ...Journal Article -
Pyrochlore-Type Iron Hydroxy Fluorides as Low-Cost Lithium-Ion Cathode Materials for Stationary Energy Storage
(2023)Advanced MaterialsPyrochlore-type iron (III) hydroxy fluorides (Pyr-IHF) are appealing low-cost stationary energy storage materials due to the virtually unlimited supply of their constituent elements, their high energy densities, and fast Li-ion diffusion. However, the prohibitively high costs of synthesis and cathode architecture currently prevent their commercial use in low-cost Li-ion batteries. Herein, a facile and cost-effective dissolution-precipitation ...Journal Article -
Building a Better Li-Garnet Solid Electrolyte/Metallic Li Interface with Antimony
(2021)Advanced Energy MaterialsThe deployment of Li-garnet Li7La3Zr2O12 (LLZO) solid-state electrolytes in solid-state batteries is severely hampered by their poor wettability with metallic Li. In this work, Sb is presented as a compelling interfacial layer allowing superior wetting of Li onto a LLZO surface, resulting in a remarkably low Li/LLZO interfacial resistance of 4.1(1) Ω cm2. An atomistic insight into Sb-coated LLZO interface using soft and hard X-ray ...Journal Article -
AlCl3‐Saturated Ionic Liquid Anolyte with an Excess of AlCl3 for Al–Graphite Dual‐Ion Batteries
(2021)Batteries and SupercapsAl–graphite dual‐ion batteries (AGDIBs) represent a compelling battery concept for large‐scale stationary storage of electricity in view of their safety, low cost, long cycling life, and high energy efficiency (80–90 %). However, at present, the deployment of AGDIBs is intrinsically limited by their low cell‐level energy density as a result of the non‐rocking‐chair operation principle and, consequently, the need for large quantities of ...Journal Article -
Laser Patterning of High-Mass-Loading Graphite Anodes for High-Performance Li-Ion Batteries
(2021)Batteries and SupercapsGiven the ongoing efforts to build Li‐ion batteries with higher volumetric energy and power densities, the research on enhancing Li‐ion transport within compressed high‐mass‐loading electrodes at fast cycling conditions is imperative. In this work, we show that the rate capability of graphite electrodes with high areal capacity of 4.5 mAh cm−2 and density of 1.79 g cm−3 (15 % of porosity) can be considerably improved by laser patterning, ...Journal Article -
Expanding the 0D Rb7M3X16 (M=Sb, Bi; X=Br, I) Family: Dual‐Band Luminescence in Rb7Sb3Br16
(2021)Helvetica Chimica ActaInorganic, lead‐free metal halides are widely sought after following the rise of the halide perovskites as outstanding optoelectronic materials, due to their enhanced stability and reduced toxicity. Herein, we report on the solvothermal synthesis of Rb7Sb3Br16, which exhibits a 0D structure comprised of [SbBr6]3− octahedra and edge‐sharing bioctahedra [Sb2Br10]4− dimers that order into layers along the c‐axis. This all‐inorganic material ...Journal Article -
The Pitfalls in Nonaqueous Electrochemistry of Al-Ion and Al Dual-Ion Batteries
(2020)Advanced Energy MaterialsThe quest for cost-effective and TWh-scale stationary energy storage systems has caused a surge of research on novel post-Li-ion batteries that consist solely of abundant chemical elements. Nonaqueous Al batteries, inter alia, are appealing as an inexpensive electrochemical technology owing to the high natural abundance of aluminum. A critical assessment of the literature on Al batteries, however, points to numerous misconceptions in this ...Journal Article -
Building better all-solid-state batteries with Li-garnet solid electrolytes and metalloid anodes
(2019)Journal of Materials Chemistry AJournal Article -
Polypyrenes as High-Performance Cathode Materials for Aluminum Batteries
(2018)Advanced MaterialsThe pressing need for low‐cost and large‐scale stationary storage of electricity has led to a new wave of research on novel batteries made entirely of components that have high natural abundances and are easy to manufacture. One example of such an anode–electrolyte–cathode architecture comprises metallic aluminum, AlCl3:[EMIm]Cl (1‐ethyl‐3‐methylimidazolium chloride) ionic liquid and graphite. Various forms of synthetic and natural graphite ...Journal Article