A5058833493- Membrane-based Ion Separation Techniques
- Advanced battery technologies research
- Carbon Dioxide Capture Technologies
- Advanced Battery Materials and Technologies
- Fuel Cells and Related Materials
- Membrane Separation Technologies
- Electrocatalysts for Energy Conversion
- Supercapacitor Materials and Fabrication
- Corrosion Behavior and Inhibition
- CO2 Reduction Techniques and Catalysts
- Electrochemical Analysis and Applications
- Catalytic Processes in Materials Science
- Membrane Separation and Gas Transport
- Ammonia Synthesis and Nitrogen Reduction
- Advanced Battery Technologies Research
- Advanced Thermoelectric Materials and Devices
- CO2 Sequestration and Geologic Interactions
- Gas Sensing Nanomaterials and Sensors
- Transition Metal Oxide Nanomaterials
- Crystallization and Solubility Studies
- Microbial Fuel Cells and Bioremediation
- X-ray Diffraction in Crystallography
- Zeolite Catalysis and Synthesis
- Ionic liquids properties and applications
- Thermal Expansion and Ionic Conductivity
University of Kentucky
2013-2022
Carnegie Mellon University
2009-2012
United States Department of Energy
2010
Mixed Fe–Ni oxide electrocatalysts for the oxygen evolution reaction in alkaline electrolytes were synthesized using three different approaches: evaporation induced self-assembly, hard templating, and dip-coating. For each synthesis method, a peak activity was observed near 10 mol % Fe content, where mixed metal substantially more active than parent electrocatalysts. X-ray diffraction (XRD) analysis showed formation of NiO/NiFe2O4 phase at low concentrations, Fe2O3 compositions above 25 Fe....
To enhance performance stability, carbon electrodes with opposite net surface charges were employed to develop the inverted capacitive deionization system.
Long-term performance of capacitive deionization (CDI) and membrane-assisted (MCDI) single cells equipped with the same pristine carbon xerogel (CX) electrodes configured as anode cathode was investigated. Unlike CDI, which subject to degradation in a short period time, MCDI showed preservation during 50 h operation due its ability mitigate charge leakage from parasitic electrochemical reactions that result oxidation. Differential capacitance measurements used CDI revealed shifting potential...
Microporous SpectraCarb carbon cloth was treated using nitric acid to enhance negative surface charges of COO(-) in a neutral solution. This acid-treated further modified by ethylenediamine attach -NH2 functional groups, resulting positive -NH3(+) via pronation Through multiple characterizations, comparison pristine carbon, amine-treated displays decreased potential zero charge but an increased point charge, which is opposed the effect obtained for carbon. An inverted capacitive deionization...
In order to examine the reliability of carbon xerogel (CX) materials for capacitive deionization (CDI), long-term operation a CDI cell with CX electrodes was performed in dilute NaCl solution. During at 1.2/0 V, performance gradually degraded, and growing inversion peak formed beginning each adsorption step. When polarity electrode reversed, use −1.2/0 V significantly boosted performance. However, this enhancement not sustained continued cycling. study, we also reported four-electrode cell,...
Electrochemical impedance spectroscopy and cyclic voltammetry were used to investigate the electrode kinetics of VII-VIII VIV-VV in H2SO4 on glassy carbon, carbon paper, xerogel, fibers. It was shown that, for all materials investigated, is enhanced by anodic, inhibited cathodic, treatment electrode; contrast, treatment. The potential region each these effects varied only slightly with material. Rate constants always greater than except when anodized electrodes compared, which may explain...
Since a capacitive deionization (CDI) cell is type of electrochemical device, its performance will be limited by the electrode with weaker ion-adsorption. A cyclic voltmmogram for freshly prepared carbon xerogel (CX) showed Na+ adsorption at cathodic branch not as favorable Cl− anodic in ∼4 mM (∼233 ppm) NaCl solution. To balance this performance, CX was specifically modified coating SiO2 particles and formation surface –COOH groups from oxidation. It observed that these modifications cannot...
Conductive, monolithic carbon xerogel electrodes have been synthesized using a flexible support and resorcinol-formaldehyde (RF) polycondensation reaction with RF precursor weight percentages of 37, 40, 45, 50 to tailor pore size distributions for electrosorption. Increased produced volumes greater than 0.4 cm3/g. External examined by SEM was shown decrease increasing percent from >300 nm <50 37 wt% RF, respectively. Carbon were used in capacitive deionization cell demonstrating...
Abstract We employ slow cyclic voltammetry to study the quasi‐steady‐state capacitive deionization (CDI) of aerated 10 mM NaCl from V cell =−0.2 2 V. The method allows for deconvolution and faradaic processes, which are significant even at low voltage, in conjunction with pH, conductivity, dissolved oxygen (DO), electrode potential measurements. pH three locations effluent DO data identify asymmetric electrosorption configured pristine activated carbon electrodes, where charge is...
X-ray crystal structures of a phenothiazine posolyte and viologen negolyte cyclic voltammograms solution containing both compounds.
In this paper, we investigate the potential of a High Efficiency Selective Electrochemical Cell (HESEC) to recover copper from variety semiconductor wastewater streams while also achieving EPA discharge compliance. The chemical-mechanical planarization (CuCMP), wet etch, and electroplating processes produce significant levels laden wastewaters with complex matrices that make recovery difficult. Based on our experimental results, HESEC provides insight into how novel electrochemical cell...
Spray-coated multiwalled carbon nanotube/poly(vinylidene fluoride) (MWCNT/PVDF) composite electrodes, scCNTs, with varying CNT compositions (2 to 70 wt %) are presented for use in a simple thermal energy-scavenging cell (thermocell) based on the ferro/ferricyanide redox couple. Their utility direct thermal-to-electrical energy conversion is explored at various temperature differentials and orientations. Performance compared that of buckypaper, 100% sheet material used as benchmark electrode...
Inverted capacitive deionization (i-CDI) is examined using microporous Spectracarb carbon electrodes in 10 mmol L–1 NaCl solution without deaeration. i-CDI testing shows that conventional operational methods, i.e., Vch = 0.8 V and Vdis 0 (0.8/0 V), cannot stabilize salt separation after approximately 409 h with an averaged adsorption capacity (SAC) of 6.0 ± mg g–1. The cycled anode possesses a collapsed cyclic voltammogram due to increase the sheet resistance by formation surface oxide...
The corrosion behavior of A106 carbon steel in piperazine, an advanced alternative postcombustion CO2 capture solvent to monoethanolamine, has been investigated. Electrochemical testing methods such as linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) have used evaluate the 0.43 mol CO2/mol alkalinity (C/N) loaded 30 wt % piperazine at 80 °C for 150 h. In addition, immersion carried out up 1050 h a traditional cell with same solution but 100 110 psi....
Ion exchange membranes provide stabilized local pH in MCDI.