A5003964217- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Electrocatalysts for Energy Conversion
- Multiferroics and related materials
- Advanced battery technologies research
- Advancements in Battery Materials
- Physics of Superconductivity and Magnetism
- Catalytic Processes in Materials Science
- Rare-earth and actinide compounds
- Fuel Cells and Related Materials
- Advanced Photocatalysis Techniques
- Advanced Battery Materials and Technologies
- Iron-based superconductors research
- Electronic and Structural Properties of Oxides
- Advancements in Solid Oxide Fuel Cells
- Inorganic Chemistry and Materials
- Copper-based nanomaterials and applications
- Supercapacitor Materials and Fabrication
- Ferroelectric and Piezoelectric Materials
- Thermal Expansion and Ionic Conductivity
- Electrochemical Analysis and Applications
- Magnetic properties of thin films
- Advanced Chemical Physics Studies
- Semiconductor materials and devices
- Crystallization and Solubility Studies
Max Planck Institute for Chemical Physics of Solids
2016-2025
University of Science and Technology of China
2024-2025
Xuzhou Medical College
2024-2025
Oregon Health & Science University
2022-2025
Tianmu Lake Institute of Advanced Energy Storage Technologies (China)
2025
Zhengzhou University
2025
Northwest University
2025
London School of Economics and Political Science
2025
Shaanxi University of Science and Technology
2024
University of Electronic Science and Technology of China
2024
Using soft x-ray absorption spectroscopy and magnetic circular dichroism at the Co-${L}_{2,3}$ edge, we reveal that spin state transition in ${\mathrm{LaCoO}}_{3}$ can be well described by a low-spin ground triply degenerate high-spin first excited state. From temperature dependence of spectral line shapes, find finite temperatures is an inhomogeneous mixed-spin system. It crucial signal paramagnetic carries large orbital momentum. This directly shows currently accepted low- or...
We found direct experimental evidence for an orbital switching in the V $3d$ states across metal-insulator transition ${\mathrm{VO}}_{2}$. have used soft-x-ray absorption spectroscopy at ${L}_{2,3}$ edges as a sensitive local probe and determined quantitatively polarizations. These results strongly suggest that, going from metallic to insulating state, occupation changes manner that charge fluctuations effective bandwidths are reduced, system becomes more one dimensional susceptible...
Abstract Rationally designing active and durable catalysts for the oxygen evolution reaction (OER) is of primary importance in water splitting. Perovskite oxides (ABO 3 ) with versatile structures multiple physicochemical properties have triggered considerable interest OER. The leaching A site cations can create nanostructures amorphous motifs on perovskite matrix, thus facilitating OER process. However, selectively dissolving simultaneously obtaining more derived from B remains a great...
We report direct experimental evidence for a room-temperature, $\ensuremath{\sim}130\text{ }\text{ }\ensuremath{\mu}\mathrm{C}/{\mathrm{cm}}^{2}$ ferroelectric polarization from the tetragonal-like ${\mathrm{BiFeO}}_{3}$ phase. The physical origin of this remarkable enhancement has been investigated by combination x-ray absorption spectroscopy, scanning transmission electron microscopy, and first principles calculations. A large strain-induced Fe-ion displacement relative to oxygen...
Abstract Developing efficient and low‐cost electrocatalysts for the oxygen evolution reaction (OER) is of paramount importance to many chemical energy transformation technologies. The diversity flexibility metal oxides offer numerous degrees freedom enhancing catalytic activity by tailoring their physicochemical properties, but active site current OER still limited either ions or lattice oxygen. Here, a new complex oxide with unique hexagonal structure consisting one honeycomb‐like network,...
Improving the catalytic efficiency of platinum for hydrogen evolution reaction is valuable water splitting technologies. Hydrogen spillover has emerged as a new strategy in designing binary-component Pt/support electrocatalysts. However, such binary catalysts often suffer from long pathway, undesirable interfacial barrier, and complicated synthetic processes. Here we report single-phase complex oxide La2Sr2PtO7+δ high-performance electrocatalyst acidic media utilizing an atomic-scale effect...
Efficient electrocatalysts for hydrogen evolution reaction are key to realize clean production through water splitting. As an important family of functional materials, transition metal oxides generally believed inactive towards reaction, although many them show high activity oxygen reaction. Here we report the remarkable electrocatalytic a layered oxide, Ruddlesden-Popper-type Sr2RuO4 with alternative perovskite layer and rock-salt SrO layer, in alkaline solution, which is comparable those...
The space charge layer (SCL) is generally considered one of the origins sluggish interfacial lithium-ion transport in all-solid-state batteries (ASSLIBs). However, in-situ visualization SCL effect on sulfide-based ASSLIBs still a great challenge. Here, we directly observe electrode/electrolyte interface accumulation resulting from by investigating net-charge-density distribution across high-voltage LiCoO2/argyrodite Li6PS5Cl using differential phase contrast scanning transmission electron...
Designing active and stable electrocatalysts with economic efficiency for acidic oxygen evolution reaction is essential developing proton exchange membrane water electrolyzers. Herein, we report on a cobalt oxide incorporated iridium single atoms (Ir-Co
Abstract The state-of-the-art active HER catalysts in acid media (e.g., Pt) generally lose considerable catalytic performance alkaline mainly due to the additional water dissociation step. To address this issue, synergistic hybrid are always designed by coupling them with metal (hydro)oxides. However, such systems usually suffer from long reaction path, high cost and complex preparation methods. Here, we discover a single-phase catalyst, SrTi 0.7 Ru 0.3 O 3-δ (STRO) perovskite oxide...
Abstract Single‐phase perovskite oxides that contain nonprecious metals have long been pursued as candidates for catalyzing the oxygen evolution reaction, but their catalytic activity cannot meet requirements practical electrochemical energy conversion technologies. Here a cation deficiency‐promoted phase separation strategy to design perovskite‐based composites with significantly enhanced water oxidation kinetics compared single‐phase counterparts is reported. These composites,...
Abstract LiCoO 2 is used as a cathode material for lithium‐ion batteries, however, cationic/anodic‐redox‐induced unstable phase transitions, oxygen escape, and side reactions with electrolytes always occur when charging to voltages higher than 4.35 V, resulting in severe capacity fade. Reported here Mg‐pillared . Dopant Mg ions, serving pillars the Li‐slab of , prevent slab sliding delithiated state, thereby suppressing unfavorable transitions. Moreover, Li‐Mg mixing structure at surface...
Abstract The ability to determine the electronic structure of catalysts during electrochemical reactions is highly important for identification active sites and reaction mechanism. Here we successfully applied soft X-ray spectroscopy follow in operando valence spin state Co ions Li 2 O 4 under oxygen evolution (OER) conditions. We have observed that a substantial fraction undergo voltage-dependent time-dependent transition from 3+ 4+ accompanied by spontaneous delithiation, whereas...
Abstract Ion leaching from pure-phase oxygen-evolving electrocatalysts generally exists, leading to the collapse and loss of catalyst crystalline matrix. Here, different previous design methodologies perovskites, we introduce soluble BaCl 2 SrCl into perovskites through a self-assembly process aimed at simultaneously tuning dual cation/anion effects optimizing ion match in protect As proof-of-concept, self-assembled hybrid Ba 0.35 Sr 0.65 Co 0.8 Fe 0.2 O 3- δ (BSCF) nanocomposite (with )...
Heterojunction nanostructures usually exhibit enhanced properties in compariosn with their building blocks and are promising catalyst candidates due to combined surface unique interface. Here, for the first time we realized oriented growth of ultrasmall metal nanoparticles (NPs) on metal–organic framework nanosheets (MOF NSs) by precisely regulating reduction kinetics ions solvents. In particular, a rapid leads random distribution NPs MOF NSs, while slow results edge NSs. Impressively,...
Herein, we developed a partially controlled pyrolysis strategy to create evenly distributed NiO nanoparticles within NiFe-MOF nanosheets (MOF NSs) for electrochemical synthesis of H2 O2 by two-electron oxygen reduction reaction (ORR). The elemental Ni can be transformed and uniformly on the surface MOF NSs, which is crucial formation particular structure. optimized NSs-300 exhibits highest activity ORR with near-zero overpotential excellent selectivity (ca. 99 %) in 0.1 m KOH solution. A...
Abstract Two‐dimensional (2D) metal–organic framework nanosheets (MOF NSs) play a vital role in catalysis, but the most preparation is ultrasonication or solvothermal. Herein, liquid–liquid interfacial synthesis method has been developed for efficient fabrication of series 2D Ni MOF NSs. The active sites could be modulated by readily tuning ratios metal precursors and organic linkers (R M/L ). NSs display highly R dependent activities towards 2e oxygen reduction reaction (ORR) to hydrogen...
Abstract Oxygen evolution reaction (OER) is a key half‐reaction in many electrochemical transformations, and efficient electrocatalysts are critical to improve its kinetics which typically sluggish due multielectron‐transfer nature. Perovskite oxides popular category of OER catalysts, while their activity remains insufficient under the conventional adsorbate scheme where scaling relations limit enhancement. The lattice oxygen‐mediated mechanism (LOM) has been recently reported overcome such...
Abstract Exploring an active and cost-effective electrocatalyst alternative to carbon-supported platinum nanoparticles for alkaline hydrogen evolution reaction (HER) have remained elusive date. Here, we report a catalyst based on single atoms (SAs) doped into the hetero-interfaced Ru/RuO 2 support (referred as Pt-Ru/RuO ), which features low HER overpotential, excellent stability distinctly enhanced cost-based activity compared commercial Pt/C Ru/C in 1 M KOH. Advanced physico-chemical...
Exploring effective, facile, and universal tuning strategies to optimize material physicochemical properties catalysis processes is critical for many sustainable energy systems, but still challenging. Herein, we succeed introduce tensile strain into various perovskites via a facile thermochemical reduction method, which can greatly improve performance the bottleneck oxygen-evolving reaction in water electrolysis. As an ideal proof-of-concept, such chemical-induced turns hydrophobic...
Abstract Amorphous materials have attracted increasing attention in diverse fields due to their unique properties, yet controllable fabrications still remain great challenges. Here, we demonstrate a top-down strategy for the of amorphous oxides through amorphization hydroxides. The versatility this has been validated by amorphizations unitary, binary and ternary Detailed characterizations indicate that process is realized variation coordination environment during thermal treatment, where...
Abstract Electrochemical CO 2 reduction (ECR) is highly attractive to curb global warming. The knowledge on the evolution of catalysts and identification active sites during reaction important, but still limited. Here, we report an efficient catalyst (Ag-D) with suitable defect concentration operando formed ECR within several minutes. Utilizing powerful fast X-ray absorption spectroscopy, evolving electronic crystal structures are unraveled under condition. exhibits a ~100% faradaic...
Understanding the catalysis mechanism of sluggish oxygen evolution reaction (OER) involved in water splitting is vital importance for development clean hydrogen energy. Earth-abundant transition-metal (oxy)hydroxide with low cost and high performance one most promising OER catalysts. These catalysts often dynamically heterogeneously transform from inactive pre-catalysts into active phases under operation conditions, thus, operando/in situ method needed direct observation. Herein, using Raman...
Producing indispensable hydrogen and oxygen for social development via water electrolysis shows more prospects than other technologies. Although electrocatalysts have been explored centuries, a universal activity descriptor both hydrogen-evolution reaction (HER) oxygen-evolution (OER) is not yet developed. Moreover, unifying concept established to simultaneously understand HER/OER mechanisms. Here, the relationships between activities in three common electrolytes over ten representative...