A5086768856- Advanced battery technologies research
- Ionic liquids properties and applications
- Conducting polymers and applications
- Advanced Battery Materials and Technologies
- Electrochemical Analysis and Applications
- CO2 Reduction Techniques and Catalysts
- Material Dynamics and Properties
- Polymer Nanocomposites and Properties
- Membrane Separation and Gas Transport
- Covalent Organic Framework Applications
- Carbon Dioxide Capture Technologies
- Fuel Cells and Related Materials
- Advanced Battery Technologies Research
- Carbon Nanotubes in Composites
- Analytical Chemistry and Sensors
- Molecular Junctions and Nanostructures
- Mesoporous Materials and Catalysis
- Electronic and Structural Properties of Oxides
- Supercapacitor Materials and Fabrication
- Silicone and Siloxane Chemistry
- Vibration Control and Rheological Fluids
- Synthesis and properties of polymers
Columbia University
2020-2024
Earth Island Institute
2021-2024
Abstract Coupling renewable energy with the electrochemical conversion of CO 2 to chemicals and fuels has been proposed as a strategy achieve new circular carbon economy help mitigate effects anthropogenic emissions. Liquid‐like Nanoparticle Organic Hybrid Materials (NOHMs) are composed polymers tethered nanoparticles previously explored capture materials electrolyte additives. In this study, two types aqueous NOHM‐based electrolytes prepared explore effect binding (i.e., chemisorption...
Nanoparticle organic hybrid materials (NOHMs) have been proposed as excellent electrolytes for combined CO 2 capture and electrochemical conversion due to their conductive nature chemical tunability. However, behavior transport properties of these after not yet studied. Here, we use a variety nuclear magnetic resonance (NMR) techniques explore the carbon speciation branched polyethylenimine (PEI) PEI-grafted silica nanoparticles (denoted NOHM-I-PEI) capture. Quantitative 13 C NMR spectra...
Integrating CO2 capture and electrochemical conversion has been proposed as a strategy to reduce the net energy required for regeneration in traditional schemes can be coupled with carbon-free renewable electricity. Polyethylenimine (PEI)-based materials have previously studied integrated these reactive processes. PEI-based electrolytes found significantly increase loading, impact selectivity rate of product formation when compared conventional aqueous electrolytes. However, influence at...
Broadband dielectric spectroscopy, rheology, and nuclear magnetic resonance spectroscopy are employed to study molecular dynamics in a nanoparticle organic hybrid material (NOHMs) system comprising 20 wt % silica nanoparticles ionically bonded polyethylenimine canopy. By comparing the neat polymer (used as canopy) derivative NOHMs, we find that timescales characterizing segmental NOHM identical those for polymer. Detailed analysis of carbon-spin lattice relaxation times yields mechanistic...
Liquid-like Nanoscale Organic Hybrid Materials or NOHMs consisting of polymer grafted nanoparticles have shown great promise in applications, such as electrochemistry and gas separation, due to their enhanced conductivity, tunability, negligible vapor pressure. Recently, are considered be used novel electrolytes Redox Flow Batteries (RFBs). However, employ redox flow batteries electrolytes, it is important understand the conformation dispersion electrochemical milieu. Here, we report use...
Nanoscale Organic Hybrid Materials (NOHMs) have unique properties that show potential for their use as novel electrolytes can interact with redox active species. In this work, we probe the effects of adding poly(ethyleneimine)-based NOHMs (NOHM-I-PEI) on copper ion electrochemical reactions. As NOHM-I-PEI is added to a solution containing Cu(II), voltammetric peak current decreases. This likely caused by strong complex formation between PEI nitrogen and copper, similar complexation observed...
As renewable energy is rapidly integrated into the grid, challenge has become storing intermittent electricity. Technologies including flow batteries and CO2 conversion to dense carriers are promising storage options for To achieve this technological advancement, development of next generation electrolyte materials that can increase density combine capture desired. Liquid-like nanoparticle organic hybrid (NOHMs) composed an inorganic core with a tethered polymeric canopy (e.g.,...
Abstract Nanoscale Organic Hybrid Materials (NOHMs) consist of polymers tethered to a nanoparticle surface, and NOHMs formed with an ionic bond between the polymer have been proposed for electrochemical applications. exhibit negligible vapor pressure, chemical tunability, oxidative thermal stability, high conductivity making them attractive in reactive separation systems. In this study, are synthesized by tethering Jeffamine M2070 (HPE) SiO 2 nanocores via (NOHM‐I‐HPE) covalent (NOHM‐C‐HPE)...
An emerging area of sustainable energy and environmental research is focused on the development novel electrolytes that can increase solubility target species improve subsequent reaction performance. Electrolytes with chemical structural tunability have allowed for significant advancements in flow batteries CO2 conversion integrated capture. Liquid-like nanoparticle organic hybrid materials (NOHMs) are nanoscale fluids composed inorganic nanocores an ionically tethered polymeric canopy....
Nanoparticle organic hybrid materials (NOHMs) are liquid-like composed of an inorganic core to which a polymeric canopy is ionically tethered. NOHMs have unique properties including negligible vapor pressure, high oxidative thermal stability, and the ability bind reactive species interest due tunability their canopy. This makes them promising multifunctional for wide range energy environmental technologies, electrolyte additives electrochemical storage (e.g., flow batteries) conversion CO2...
Schematic showing the ordering of free HPE polymer in D 2 O (left), static NOHM-I-HPE (middle), and a negative potential (right) near gold electrode.
As a result of the growing need for direct air capture (DAC) and integrated carbon conversion technologies, CO2 materials that can withstand wide range environmental conditions, including fluctuating ambient temperatures high concentrations oxidizing agents (i.e., oxygen moisture), are critically needed. Liquid-like nanoparticle organic hybrid (NOHMs) have been proposed as candidates DAC electrolyte additives, enabling sustainable energy storage flow batteries). NOHMs functionalized with an...
Recently, nanoparticle organic hybrid materials (NOHMs) have been considered promising electrolytes for energy storage applications due to their unique combination of properties, which include high thermal stability, negligible vapor pressure, and easy synthesis. However, the structural features NOHMs in electrochemical systems are not well understood. Hence, we investigate impact grafting type (ionic vs covalent) on structure performance that consist a silica core grafted HPE polymer...
The electrode-electrolyte interface is perhaps the most important of an electrochemical device. At this interface, reactions interest occur, and local microenvironment (e.g. pH, reactant concentrations, water activity) can differ significantly from bulk electrolyte conditions due to double layer formation, migration, mass transport effects, catalyst restructuring, more. In addition, common electrode materials such as polycrystalline metal foils nanoparticle layers are heterogeneous with...
Broadband dielectric spectroscopy (BDS), differential scanning calorimetry (DSC) and Raman are employed to study a series of nanoscale organic-inorganic hybrid materials (NOHMs) comprising 20 wt% silica nanoparticles either covalently or ionically-bonded polymer canopies. By comparing the NOHMs neat polymers used as canopies in their synthesis, we find that timescales characterizing molecular dynamics largely depend on interaction between inorganic cores organic Interestingly, NOHM retain...
The potential use of nanoparticle organic hybrid materials (NOHM) as electrolytes in redox flow batteries is being explored. NOHMs are composite particles formed by polymers grafted (either ionically or covalently) onto surface-modified inorganic nanoparticles. Such structure has great to capture and carry nonpolar electroactive species. 1 In this work, the protonation behavior, effect NOHM structures have on metal cation uptake evaluated. Both considered analysis comprise silica cores with...
Nanoparticle organic hybrid materials, also known as NOHMs, are composite particles formed by polymers grafted (either ionically or covalently) onto surface-modified inorganic nanoparticles. The unique structure and liquid-like properties of such material have promoted the interest on its application an electrolyte with potential to capture carry nonpolar electroactive species. In this work two types NOHMs considered. Both systems comprise silica cores polymer tails. tails correspond...