A5086706052- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Advanced battery technologies research
- Advanced Battery Technologies Research
- Conducting polymers and applications
- Metal-Organic Frameworks: Synthesis and Applications
- X-ray Diffraction in Crystallography
- Gold and Silver Nanoparticles Synthesis and Applications
- Nanocluster Synthesis and Applications
- Crystallization and Solubility Studies
- Quantum Dots Synthesis And Properties
- Organic Electronics and Photovoltaics
- Machine Learning in Materials Science
- Nanomaterials for catalytic reactions
- Perovskite Materials and Applications
- Catalysis and Hydrodesulfurization Studies
- Lanthanide and Transition Metal Complexes
- TiO2 Photocatalysis and Solar Cells
- Zeolite Catalysis and Synthesis
- Electrochemical Analysis and Applications
- Supercapacitor Materials and Fabrication
- Advanced Sensor and Energy Harvesting Materials
- Vagus Nerve Stimulation Research
- Inorganic Fluorides and Related Compounds
- Catalysis and Oxidation Reactions
Stanford University
2017-2022
National Formosa University
2021-2022
Stanford Medicine
2018
National Tsing Hua University
2013-2016
ExxonMobil (United States)
1996-1999
Lithium-sulfur (Li-S) batteries are regarded as promising next-generation high energy density storage devices for both portable electronics and electric vehicles due to their density, low cost, environmental friendliness. However, there remain some issues yet be fully addressed with the main challenges stemming from ionically insulating nature of sulfur dissolution polysulfides in electrolyte subsequent parasitic reactions leading utilization poor cycle life. The flammability is another...
Redox mediators (RMs) play a vital role in some liquid electrolyte-based electrochemical energy storage systems. However, the concept of redox mediator solid-state batteries remains unexplored. Here, we selected group RM candidates and investigated their behaviors roles all-solid-state lithium-sulfur (ASSLSBs). The soluble-type quinone-based (AQT) shows most favorable potential best reversibility that functions well for lithium sulfide (Li2S) oxidation solid polymer electrolytes....
In this study, rhombic dodecahedral gold nanocrystals were used as cores for the generation of Au-Ag core-shell with cubic, truncated cuboctahedral, octahedral, and octahedral structures. Gold added to an aqueous mixture cetyltrimethylammonium chloride (CTAC) surfactant, AgNO3, ascorbic acid, NaOH form nanocrystals. The are highly uniform in size shape, can readily self-assemble into ordered packing structures on substrates. Results from observation solution color changes variation reaction...
Three-dimensional hierarchical porous carbon materials with flower-like superstructures are of great interest for energy applications since their unique shape not only provides high accessible surface area and consequently more exposed active sites but also facilitates ion transport high-rate capability. However, finding a controllable way to make carbons such specific shapes has been challenging. Herein, we report tunable simple method one-pot synthesis polyacrylonitrile its copolymer...
Abstract Lithium–sulfur (Li–S) batteries involve a reversible conversion reaction between sulfur and lithium sulfide (Li 2 S) via series of soluble polysulfide intermediates (LiPSs), enabling high theoretical specific capacity 1675 mAh g –1 . However, this process exhibits large polarization low utilization suffers critical fade. The primary approach to tackle the problem has so far been infiltrate into nanostructured carbon. most studies using porous carbon as host materials have tested...
The solid electrolyte interphase (SEI) is an integral part of Li-ion batteries and their performance, representing the key enabler for reversibility also serving as a major source capacity loss dictating cell kinetics. In pervasive LiPF6-containing electrolytes, LiF one SEI's components; however, its formation mechanism remains unclear. Electrochemically, two separate reduction pathways could lead to LiF, either via direct anion or electrocatalytic transformation HF. This work aims shed...
The reaction pathways and kinetics of n-hexadecane hydroisomerization hydrocracking were determined in the presence each three platinum-containing dual-function catalysts: (a) Pt on a proprietary zeolite (Pt/Ζ), (b) silica−alumina (Pt/Si−Al), (c) MCM-41 (Pt/MCM-41). networks used to interpret differences isomerization selectivity. low selectivity observed Pt/Si−Al was shown be consequence changes both relative isomerization/cracking rates pathways. Using classical bifunctional scheme,...
Combined experimental and theoretical insights into electrolyte–electrode interfaces relevant to lithium ion batteries.
Abstract Two seed‐mediated approaches for the growth of silver nanocubes in aqueous solution have been developed. Addition a silver‐seed to mixture cetyltrimethylammonium chloride (CTAC), trifluoroacetate, and ascorbic acid heating at 60 °C 1.5 h produces uniform Ag with tunable sizes from 23 nm by simply adjusting volume introduced. Alternatively, can be injected into bromide (CTAB), nitrate, copper sulfate, heated 80 2 generate 46 nanocubes. Plate‐like nanocrystals exposing {111} surfaces...
The cyclability of silicon anodes in lithium ion batteries (LIBs) is affected by the reduction electrolyte on anode surface to produce a coating layer termed solid interphase (SEI). One key steps for major improvement LIBs unraveling SEI's structure-related diffusion properties as charge and discharge rates are diffusion-limited. To this end, we have combined two sensitive techniques, sum frequency generation (SFG) vibrational spectroscopy, X-ray reflectivity (XRR), explore first monolayer...
Super-concentrated "water-in-salt" electrolytes recently spurred resurgent interest for high energy density aqueous lithium-ion batteries. Thermodynamic stabilization at concentrations and kinetic barriers towards interfacial water electrolysis significantly expand the electrochemical stability window, facilitating voltage cells. Herein we investigated LiTFSI/H2 O electrolyte decomposition pathways in "salt-in-water" regimes using synchrotron X-rays, which produce electrons solid/electrolyte...
Palladium octahedra, truncated cuboctahedra, cubes, and nanocubes with sizes of tens nanometers have been synthesized in an aqueous mixture H2PdCl4 solution, cetyltrimethylammonium chloride (CTAC) surfactant, KBr dilute KI ascorbic acid solution at 35 °C for 30 min. By tuning the amount introduced, particle shape control can be achieved. Adjusting volumes Pd precursor solutions added, smaller larger nanocrystals were obtained excellent control. Extensive structural optical characterization...
Abstract The solid electrolyte interphase (SEI) has been identified as a key challenge for Li metal anodes. brittle and inhomogeneous native SEI generated by parasitic reactions between liquid electrolytes can devastate battery performance; therefore, artificial SEIs (ASEIs) have proposed an effective strategy to replace SEIs. Herein, collaboration academia industrial R&D teams, multifunctional (crystalline, high modulus, robust, + ion conductive, electrolyte‐blocking, solution...
Porous carbons have previously been widely used as host materials for sulfur (S) electrodes because of their high conductivity and surface area. However, they generally lack strong chemical affinity to stabilize polysulfide species. Therefore, conducting polymers employed S electrodes. Integrating with high-surface-area can create a new platform synergize functions. the were often insoluble, coating them uniformly from solution onto nonpolar carbon substrate is challenge. Here, we report...
Abstract Super‐concentrated “water‐in‐salt” electrolytes recently spurred resurgent interest for high energy density aqueous lithium‐ion batteries. Thermodynamic stabilization at concentrations and kinetic barriers towards interfacial water electrolysis significantly expand the electrochemical stability window, facilitating voltage cells. Herein we investigated LiTFSI/H 2 O electrolyte decomposition pathways in “salt‐in‐water” regimes using synchrotron X‐rays, which produce electrons...
Abstract A high performance diketopyrrolopyrrole (DPP)–based semiconducting polymer is modified with ligands to enable metal coordination, and its subsequent effect as field‐effect transistors investigated. In specific, pyridine‐2,6‐dicarboxamide (PDCA) units are incorporated in a DPP–based backbone content from 0 30 mol%, the resulting polymers then mixed Fe(II) ions. The coordination spontaneous oxidation converts Fe(III) ions result Fe(III)‐containing metallopolymers. metallopolymers...
Host-guest interactions govern the chemistry of a broad range functional materials. However, weak bonding between host and guest prevents atomic-resolution studies their structure using transmission electron microscopy (TEM). This problem is exacerbated in metal-organic frameworks (MOF), which framework easily damaged by beam. Here, we use cryogenic-electron (cryo-EM) to simultaneously address these two challenges resolve atomic surface zeolitic imidazolate (ZIF-8) its interaction with CO2...