A5105405208- Electrocatalysts for Energy Conversion
- Catalytic Processes in Materials Science
- Advanced battery technologies research
- Aluminum Alloys Composites Properties
- Magnesium Alloys: Properties and Applications
- Advanced Photocatalysis Techniques
- Catalysis and Oxidation Reactions
- Advancements in Battery Materials
- Fuel Cells and Related Materials
- Metal-Organic Frameworks: Synthesis and Applications
- Advanced Welding Techniques Analysis
- Covalent Organic Framework Applications
- Electrochemical Analysis and Applications
- Advanced Battery Materials and Technologies
- High Entropy Alloys Studies
- Electronic and Structural Properties of Oxides
- Nanomaterials for catalytic reactions
- Conducting polymers and applications
- Microstructure and mechanical properties
- Advanced Nanomaterials in Catalysis
- Advanced Sensor and Energy Harvesting Materials
- CO2 Reduction Techniques and Catalysts
- Supercapacitor Materials and Fabrication
- High-Temperature Coating Behaviors
- Aluminum Alloy Microstructure Properties
Stanford University
2019-2025
SLAC National Accelerator Laboratory
2019-2024
Shenyang Aerospace University
2009-2023
Argonne National Laboratory
2018-2023
Stanford Synchrotron Radiation Lightsource
2020-2021
Shanghai Institute of Ceramics
2015-2019
Chinese Academy of Sciences
2015-2019
Menlo School
2019
China Institute of Atomic Energy
2019
University of Chinese Academy of Sciences
2016-2018
It remains highly desired but a great challenge to achieve atomically dispersed metals in high loadings for efficient catalysis. Now porphyrinic metal-organic frameworks (MOFs) have been synthesized based on novel mixed-ligand strategy afford high-content (1.76 wt %) single-atom (SA) iron-implanted N-doped porous carbon (FeSA -N-C) via pyrolysis. Thanks the Fe sites, hierarchical pores, oriented mesochannels and conductivity, optimized FeSA -N-C exhibits excellent oxygen reduction activity...
Abstract The great interest in fuel cells inspires a substantial amount of research on nonprecious metal catalysts as alternatives to Pt‐based oxygen reduction reaction (ORR) electrocatalysts. In this work, bimodal template‐based synthesis strategies are proposed for the scalable preparation hierarchically porous M–N–C (M = Fe or Co) single‐atom electrocatalysts featured with active and robust MN 2 moieties. Multiscale tuning regarding increasing number sites boosting intrinsic activity each...
The tailorable structure and electronic of metal-organic frameworks (MOFs) greatly facilitate their modulated light harvesting, redox power, consequently photocatalysis. Herein, a representative MOF, UiO-66, was furnished by installing Fe3+ onto the Zr-oxo clusters, to give Fe-UiO-66, which features extended visible based on metal-to-cluster charge transfer (MCCT). Fe-UiO-66 with unique strong oxidizing power exhibits light-driven water oxidation, is impossible for pristine UiO-66. More...
Abstract Single-atom catalysts (SACs) have sparked broad interest recently while the low metal loading poses a big challenge for further applications. Herein, dual protection strategy has been developed to give high-content SACs by nanocasting SiO 2 into porphyrinic metal–organic frameworks (MOFs). The pyrolysis of @MOF composite affords single-atom Fe implanted N-doped porous carbon (Fe SA –N–C) with high (3.46 wt%). spatial isolation atoms centered in porphyrin linkers MOF sets first...
Abstract Single‐atom catalysts (SACs) are of great interest because their ultrahigh activity and selectivity. However, it is difficult to construct model SACs according a general synthetic method, therefore, discerning differences in diverse single‐atom not straightforward. Herein, strategy for synthesis metals implanted N‐doped carbon (M 1 ‐N‐C; M=Fe, Co, Ni Cu) has been developed starting from multivariate metal–organic frameworks (MOFs). The M ‐N‐C catalysts, featuring identical chemical...
Metal–organic framework precursors were employed to fabricate single-atom catalysts, where Fe implanted nitrogen-doped carbon (Fe<sub>1</sub>-N-C) exhibits excellent performance for electrocatalytic nitrogen reduction in acidic media.
The transformation from crystalline SrIrO 3 to active amorphous iridium oxide electrocatalyst occurs via the lattice oxygen redox.
Supported precious metals with atomic dispersion are of great interest in catalysis due to their potentials achieving maximum atom efficiency and unique reactivities. Herein, the active sites for low-temperature CO oxidation elucidated over single-atom Pd1/CeO2 catalysts prepared via high-temperature trapping (AT). The increased oxygen vacancies on CeO2 surface induced by 800 °C air calcination result decreased Pd–CeO2 coordinations, i.e., coordination-unsaturated Pd2+ CeO2. Light-off...
Single-atom catalysts (SACs) are witnessing rapid development due to their high activity and selectivity toward diverse reactions. However, it remains a grand challenge in the general synthesis of SACs, particularly featuring an identical chemical microenvironment on same support. Herein, universal synthetic protocol is developed immobilize SACs metal-organic frameworks (MOFs). Significantly, by means SnO2 as mediator or adaptor, not only different single-atom metal sites, such Pt, Cu, Ni,...
Abstract A single‐atom Pt 1 /CeO 2 catalyst formed by atom trapping (AT, 800 °C in air) shows excellent thermal stability but is inactive for CO oxidation at low temperatures owing to over‐stabilization of 2+ a highly symmetric square‐planar O 4 coordination environment. Reductive activation form nanoparticles (NPs) results enhanced activity; however, the NPs are easily oxidized, leading drastic activity loss. Herein we show that tailoring local environment isolated thermal‐shock (TS)...
A trade-off between catalytic activity and structural stability generally exists in oxygen evolution electrocatalysis, especially acidic environment. This dilemma limits the development of higher-performance electrocatalysts that are required by next-generation electrochemical technologies. Here it is demonstrated inverse activity-structural relation can be broken alloying catalytically inert strontium zirconate with other active perovskite, iridate. strategy results an alloyed perovskite...
Abstract It remains highly desired but a great challenge to achieve atomically dispersed metals in high loadings for efficient catalysis. Now porphyrinic metal–organic frameworks (MOFs) have been synthesized based on novel mixed‐ligand strategy afford high‐content (1.76 wt %) single‐atom (SA) iron‐implanted N‐doped porous carbon (Fe SA ‐N‐C) via pyrolysis. Thanks the Fe sites, hierarchical pores, oriented mesochannels and conductivity, optimized ‐N‐C exhibits excellent oxygen reduction...
Ionic substitution forms an essential pathway to manipulate the carrier density and crystalline symmetry of materials via ion-lattice-electron coupling, leading a rich spectrum electronic states in strongly correlated systems. Using ferromagnetic metal SrRuO3 as model system, we demonstrate efficient reversible control both through ionic liquid gating induced protonation. The insertion protons electron-dopes SrRuO3, exotic paramagnetic phase transition along with increase proton...
Abstract The development of cost‐effective catalysts to replace noble metal is attracting increasing interests in many fields catalysis and energy, intensive efforts are focused on the integration transition‐metal sites carbon as noble‐metal‐free candidates. Recently, discovery single‐atom dispersed catalyst (SAC) provides a new frontier heterogeneous catalysis. However, electrocatalytic application SAC still subject several theoretical experimental limitations. Further advances depend...
Identifying positive electrode materials capable of reversible multivalent electrochemistry in electrolytes containing divalent ions such as Mg2+, Ca2+, and Zn2+ at high operating potentials remains an ongoing challenge "beyond lithium-ion" research. Herein, we explore the charge-storage mechanism a vanadium-based Na+ superionic conductor (NASICON), Na3V2(PO4)3. By using X-ray synchrotron techniques to unravel potential-dependent structure–property relationships, ascribe electrochemical...
The concept of water-in-salt electrolytes was introduced recently, and these systems have been successfully applied to yield extended operation voltage hence significantly improved energy density in aqueous Li-ion batteries. In the present work, results X-ray scattering Fourier-transform infrared spectra measurements over a wide range temperatures salt concentrations are reported for LiTFSI (lithium bis(trifluoromethane sulfonyl)imide)-based electrolyte. Classical molecular dynamics...
Applications of aqueous zinc batteries for grid-scale energy storage are limited by their poor reversibility and the competing water splitting reaction. The recent invention a water-in-salt (WIS) electrolyte concept provides new route enabling stable highly reversible battery chemistry. In present work, mixed bis(trifluoromethane sulfonyl)imide (Zn(TFSI)2) LiTFSI WIS was studied using X-ray total scattering, absorption, Fourier transform infrared spectroscopy in conjunction with classical...
Abstract Stretching a coiled carbon nanotube (CNT) yarn can provide large, reversible electrochemical capacitance changes, which convert mechanical energy to electricity. Here, it is shown that the performance of these “twistron” harvesters be increased by optimizing alignment precursor CNT forests, plastically stretching twisted yarn, applying much higher tensile loads during precoiling twist than for coiling, using electrothermal pulse annealing under tension, and incorporating reduced...
Self-discharge and chemically induced mechanical effects degrade calendar cycle life in intercalation-based electrochromic electrochemical energy storage devices. In rechargeable lithium-ion batteries, self-discharge cathodes causes voltage capacity loss over time. The prevailing model centers on the diffusion of lithium ions from electrolyte into cathode. We demonstrate an alternative pathway, where hydrogenation layered transition metal oxide induces through hydrogen transfer carbonate...