Miaofang Chi

Journal Article Nature communications · February 2025 Despite numerous efforts involving surface coating, doping, and alloying, maintaining surface stability of metal at high temperatures without compromising intrinsic properties has remained challenging. Here, we present a pragmatic method to address the acc ... Full text Cite

Advanced Compressive Sensing and Dynamic Sampling for 4D-STEM Imaging of Interfaces.

Journal Article Small methods · January 2025 Interfaces in energy materials and devices often involve beam-sensitive materials such as fast ionic, soft, or liquid phases. 4D scanning transmission electron microscopy (4D-STEM) offers insights into local lattice, strain charge, and field distributions, ... Full text Cite

Flux Synthesis of A-site Disordered Perovskite La0.5M0.5TiO3 (M═Li, Na, K) Nanorods Tailored for Solid Composite Electrolytes.

Journal Article Advanced science (Weinheim, Baden-Wurttemberg, Germany) · January 2025 Inorganic fillers play an important role in improving the ionic conductivity of solid composite electrolytes (SCEs) for Li-ion batteries. Among inorganic fillers, perovskite-type lithium lanthanum titanate (LLTO) stands out for its high bulk Li+ ... Full text Cite

Facile Interfacial Reduction Suppresses Redox Chemical Expansion and Promotes the Polaronic to Ionic Transition in Mixed Conducting (Pr,Ce)O_2-δ Nanoparticles.

Journal Article ACS applied materials & interfaces · January 2025 Mixed ionic/electronic conductors (MIECs) are essential components of solid-state electrochemical devices, such as solid oxide fuel/electrolysis cells. For efficient performance, MIECs are typically nanostructured, to enhance the reaction kinetics. However ... Full text Cite

Materials laboratories of the future for alloys, amorphous, and composite materials

Journal Article MRS Bulletin · January 1, 2025 In alignment with the Materials Genome Initiative and as the product of a workshop sponsored by the US National Science Foundation, we define a vision for materials laboratories of the future in alloys, amorphous materials, and composite materials; chart a ... Full text Cite

Correction: Materials laboratories of the future for alloys, amorphous, and composite materials (MRS Bulletin, (2025), 50, 2, (190-207), 10.1557/s43577-024-00846-y)

Journal Article MRS Bulletin · January 1, 2025 This article was updated to correct Minghao Zhang’s affiliation from “Pritzker School of Molecular Engineering, The University of Chicago, Chicago, USA” to “Pritzker School of Molecular Engineering, The University of Chicago, Chicago, USA; Argonne National ... Full text Cite

A General Approach for Metal Nanoparticle Encapsulation Within Porous Oxides.

Journal Article Advanced materials (Deerfield Beach, Fla.) · December 2024 Encapsulation of metal nanoparticles within oxide materials has been shown as an effective strategy to improve activity, selectivity, and stability in several catalytic applications. Several approaches have been proposed to encapsulate nanoparticles, such ... Full text Cite

The Key Role of Grain Boundary Dynamics in Revolutionizing the Potential of Solid Electrolytes

Journal Article Advanced Functional Materials · November 5, 2024 Solid electrolytes (SEs) have the potential to enhance the safety and performance of Li-metal batteries. However, the existence of grain boundaries in polycrystalline SEs presents a significant challenge for both ionic and electronic migration, promoting t ... Full text Cite

Calibrating cryogenic temperature of TEM specimens using EELS.

Journal Article Ultramicroscopy · November 2024 Cryogenic Scanning/Transmission Electron Microscopy has been established as a leading method to image sensitive biological samples and is now becoming a powerful tool to understand materials' behavior at low temperatures. However, achieving precise local t ... Full text Cite

Achieving the 1D Atomic Chain Limit in Van der Waals Crystals.

Journal Article Advanced materials (Deerfield Beach, Fla.) · November 2024 Experiments with graphene have demonstrated that 2D van der Waals materials can be stable, robust, and efficiently manipulated at the level of individual atomic planes. However, the stability and manipulation of 1D van der Waals materials and individual at ... Full text Cite

Dynamic Behavior of Pt Multimetallic Alloys for Active and Stable Propane Dehydrogenation Catalysts.

Journal Article Journal of the American Chemical Society · November 2024 Improving the use of platinum in propane dehydrogenation catalysts is a crucial aspect to increasing the efficiency and sustainability of propylene production. A known and practiced strategy involves incorporating more abundant metals in supported platinum ... Full text Cite

Eliminating chemo-mechanical degradation of lithium solid-state battery cathodes during >4.5 V cycling using amorphous Nb2O5 coatings.

Journal Article Nature communications · November 2024 Lithium solid-state batteries offer improved safety and energy density. However, the limited stability of solid electrolytes (SEs), as well as irreversible structural and chemical changes in the cathode active material, can result in inferior electrochemic ... Full text Cite

Real-space visualization of atomic displacements in a long-wavelength charge density wave using cryogenic 4D-STEM

Journal Article Physical Review Materials · October 1, 2024 EuAl4, a known skyrmion magnet, represents a class of materials that show complex electronic behaviors involving long-wavelength charge density wave (CDW). Here we realize direct real-space imaging of the concomitant periodic lattice distortion (PLD) with ... Full text Cite

High-speed 4-dimensional scanning transmission electron microscopy using compressive sensing techniques.

Journal Article Journal of microscopy · September 2024 Here we show that compressive sensing allows 4-dimensional (4-D) STEM data to be obtained and accurately reconstructed with both high-speed and reduced electron fluence. The methodology needed to achieve these results compared to conventional 4-D approache ... Full text Cite

Atomic Scale Responses of High Entropy Oxides to Redox Environments.

Journal Article Nano letters · September 2024 The potential of high entropy oxides (HEOs) as high-performance energy storage materials and catalysts has been mainly understood through their bulk structures. However, the importance of their surfaces, which may play an even more critical role, remains l ... Full text Cite

Percolating Interfacial Layers Enhance Conductivity in Polymer-Composite Electrolytes

Journal Article Macromolecules · August 13, 2024 This study investigates the impact of the ceramic particle size on the bulk and interfacial ion transport properties of composite polymer electrolytes. The ceramic particles used for this study are micrometer-sized commercial lithium lanthanum titanate (LL ... Full text Cite

Sintering Mechanism of Pt/Al2O3 in Complex Emission Gases Elucidated via In Situ Environmental STEM

Journal Article ACS Materials Letters · August 5, 2024 Emission control catalysts are crucial for protecting human health by preventing the release of harmful gases and unburnt fuel into the atmosphere. These catalysts often face deactivation through sintering processes in high-temperature, chemically reactive ... Full text Cite

Unveiling the Stability of Encapsulated Pt Catalysts Using Nanocrystals and Atomic Layer Deposition.

Journal Article Journal of the American Chemical Society · August 2024 Platinum exhibits desirable catalytic properties, but it is scarce and expensive. Optimizing its use in key applications such as emission control catalysis is important to reduce our reliance on such a rare element. Supported Pt nanoparticles (NPs) used in ... Full text Cite