A5025264570- CO2 Reduction Techniques and Catalysts
- Advanced battery technologies research
- Fuel Cells and Related Materials
- Membrane-based Ion Separation Techniques
- Electrocatalysts for Energy Conversion
- Ionic liquids properties and applications
- Hybrid Renewable Energy Systems
- Advanced Thermoelectric Materials and Devices
- Carbon Dioxide Capture Technologies
- Software Reliability and Analysis Research
- Electrochemical Analysis and Applications
- Software Engineering Research
- Software Engineering Techniques and Practices
- Advanced Photocatalysis Techniques
- Advancements in Solid Oxide Fuel Cells
- Ammonia Synthesis and Nitrogen Reduction
- Medical Imaging Techniques and Applications
- Advanced Battery Technologies Research
- Various Chemistry Research Topics
- 3D Printing in Biomedical Research
- Cellular Mechanics and Interactions
- Mechanical Circulatory Support Devices
- Machine Learning in Materials Science
- Conducting polymers and applications
- Molten salt chemistry and electrochemical processes
Royal Perth Hospital
2025
University of California, Berkeley
2019-2024
Lawrence Berkeley National Laboratory
2020-2024
nLIGHT (United States)
2021-2024
Digital Research Alliance of Canada
2021-2023
Joint Center for Artificial Photosynthesis
2020-2022
Sir Charles Gairdner Hospital
2022
Texas College
2020
Columbia University
2017-2019
Texas A&M University
2019
ConspectusThe electrochemical reduction of carbon dioxide (CO2R) driven by renewably generated electricity (e.g., solar and wind) offers a promising means for reusing the CO2 released during production cement, steel, aluminum as well ammonia methanol. If could be removed from atmosphere at acceptable costs (i.e., <$100/t CO2), then CO2R used to produce carbon-containing chemicals fuels in fully sustainable manner. Economic considerations dictate that current densities must range 0.1 1 A/cm2...
Bipolar membranes (BPMs) enable control of ion concentrations and fluxes in electrochemical cells suitable for a wide range applications. Here we present the multi-scale physics BPMs an engineering context articulate design principles to drive development advanced BPMs. The chemistry, structure, are illustrated related thermodynamics, transport phenomena, chemical kinetics that dictate species selectivity. These interactions give rise emergent structure–property–performance relationships...
We demonstrate pOH imaging with confocal microscopy to probe the microenvironment of an operating CO 2 reduction gas diffusion electrode. find that micrometer-scale morphology plays important role in defining performance.
Pulsed electrolysis has been demonstrated to improve the faradaic efficiency (FE) C2+ products during electrochemical reduction of CO2 over a Cu catalyst, but nature this enhancement is poorly understood. Herein, we developed time-dependent continuum model pulsed on in 0.1 M CsHCO3 that faithfully represents experimentally observed effects electrolysis. This work shows pulsing results dynamic changes pH and concentration near surface, which lead an enhanced FE as consequence repeatedly...
Bipolar membranes (BPMs) have the potential to become critical components in electrochemical devices for a variety of electrolysis and electrosynthesis applications. Because they can operate under large pH gradients, BPMs enable favorable environments electrocatalysis at individual electrodes. Critical implementation these is understanding kinetics water dissociation that occurs within BPM as well co- counter-ion crossover through BPM, which both present significant obstacles developing...
Bicarbonate electrolyzers are devices designed to convert CO2 captured from point sources or the atmosphere into chemicals and fuels without needing first isolate pure gas. We report here an experimentally validated model that quantifies reaction chemistry mass transfer processes within catalyst layer cation exchange membrane of a bicarbonate electrolyzer. Our results demonstrate two distinct chemical microenvironments key forming CO at high rates: acidic promotes in situ formation basic...
We report an electrochemical reactor that converts 3.0 M KHCO3 into methane at the cathode, and oxidizes water anode. The molar ratio of product to unreacted CO2 gas (defined herein as "methane yield") was measured be 34% a partial current density 120 mA cm–2. highest previously reported CO2-to-methane yield is 3%. Our achieved this improvement in because it fed with KHCO3, type reactive carbon solution, rather than gaseous CO2. uses H+ delivered by bipolar membrane form cathode. This...
Continuum modeling elucidates non-equilibrium behavior in bipolar membranes (BPMs) used for carbon capture. The model resolves contributions to applied voltage, identifying CO 2 bubble removal and water dissociation catalysis as the dominant energy losses.
Integrated solar fuels devices for CO 2 reduction (CO R) are a promising technology class towards reducing emissions.
This work describes a membraneless electrolyzer in which all key components are fabricated by 3D-printing processes.
In electrocatalysis, the rate of a reaction as function applied potential is governed by Tafel equation, which depends on two parameters: slope and exchange current density (i0). However, methods to determine these parameters involve subjective removal data due convoluted effects mass transfer competitive surface or bulk reactions, resulting in unquantifiable uncertainty. To overcome this challenge, we couple covariance matrix adaptation with continuum model CO2 reduction (CO2R) that...
Many electrochemical energy-conversion systems are evaluated by polarization curves, which report the cell voltage across a range of current densities and global measure operation state health. Mathematical models can be used to deconstruct measured overall identify quantify voltage-loss sources, such as kinetic, ohmic, mass-transport effects. These results elucidate best pathways for improved performance. In this work, we discuss several voltage-breakdown methods provide examples different...
Bipolar membranes (BPMs) possess the potential to optimize pH environments for electrochemical synthesis applications when employed in reverse bias. Unfortunately, performance of BPMs bias has long been limited by rate water dissociation (WD) occurring at interface BPM. Herein, we develop a continuum model BPM that agrees with experiment understand and enhance WD catalyst considering multiple kinetic pathways junction layer. The reveals catalysts more highly alkaline or acidic point zero...
Bipolar membranes (BPMs) enable isolated acidic/alkaline regions in electrochemical devices, facilitating optimized environments for separations and catalysis. For economic viability, BPMs must attain stable, high current density operation with low overpotentials a freestanding configuration. We report an asymmetric, graphene oxide (GrOx)-catalyzed BPM capable of electrodialysis at 1 A cm–2 <250 mV. Use thin anion-exchange layer improves water transport while maintaining near unity Faradaic...
There is increasing interest in the possibility of photoelectrochemical (PEC) reduction CO2 to C2+ products; however, criteria for maximizing PEC solar-to-C2+ (STC2+) rates are not well understood. We report here a continuum-scale model (CO2R) on Cu 0.1 M CsHCO3 and use it optimize design operating conditions generating products. demonstrate that potential-dependent product distribution CO2R requires near potential maximizes generation (Vid), unlike water splitting, which desires operation...
Bipolar membranes (BPMs) enable isolated acidic/alkaline regions in electrochemical devices, facilitating optimized catalytic environments for water electrolysis, CO2 reduction, and electrodialysis. For economic feasibility, BPMs must achieve stable, high current density operation with low overpotentials. We report a graphene oxide (GrOx) catalyzed, asymmetric BPM capable of electrodialysis at 1 A cm-2 overpotentials < 250 mV. Experiments continuum modeling demonstrate that the...
We present GaSpCT, a novel view synthesis and 3D scene representation method used to generate projection views for Computer Tomography (CT) scans. adapt the Gaussian Splatting framework enable in CT based on limited sets of 2D image projections without need Structure from Motion (SfM) methodologies. Therefore, we reduce total scanning duration amount radiation dose patient receives during scan. adapted loss function our use-case by encouraging stronger background foreground distinction using...