A5011667479- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Electrochemical sensors and biosensors
- Electrochemical Analysis and Applications
- Membrane-based Ion Separation Techniques
- Microbial Fuel Cells and Bioremediation
- Supercapacitor Materials and Fabrication
- Electric and Hybrid Vehicle Technologies
- Advancements in Solid Oxide Fuel Cells
- Advanced Nanomaterials in Catalysis
- Hybrid Renewable Energy Systems
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Scientific and Engineering Research Topics
- Asymmetric Hydrogenation and Catalysis
- Nanomaterials for catalytic reactions
- Conducting polymers and applications
- Advanced biosensing and bioanalysis techniques
- Smart Grid Security and Resilience
- Chemical Synthesis and Characterization
- Synthetic Organic Chemistry Methods
- Pulsed Power Technology Applications
- CO2 Reduction Techniques and Catalysts
- IoT Networks and Protocols
University of Delaware
2018-2023
Wilmington University
2020
University of New Mexico
2014-2019
Development and optimization of non-platinum group metal (non-PGM) electrocatalysts for oxygen reduction reaction (ORR), consisting transition metal–nitrogen–carbon (M–N–C) framework, is hindered by the partial understanding mechanisms precise chemistry active site or sites. In this study, we have analyzed more than 45 M–N–C synthesized from three different families precursors, such as polymer-based, macrocycles, small organic molecules. Catalysts were electrochemically tested structurally...
A new anion exchange membrane (PiperION) in conjunction with a tailored zero-gap electrolyzer cell allows unprecedented partial current densities.
The impact of the electrolyte's pH on catalytic activity platinum group metal-free (PGM-free) catalysts toward oxygen reduction reaction (ORR) was studied. results indicate that ORR mechanism is determined by affinity protons and hydroxyls multiple functional groups present surface PGM-free catalyst. It shown limited proton-coupled electron transfer at values below 10.5. At higher (>10.5), occurs in outer Helmholtz plane (OHP), favoring hydrogen peroxide production. Using a novel approach,...
Different iron-based cathode catalysts have been studied for oxygen reduction reaction (ORR) in neutral media and then applied into microbial fuel cells (MFC). The synthesized using sacrificial support method (SSM) eight different organic precursors named Niclosamide, Ricobendazole, Guanosine, Succinylsulfathiazole, Sulfacetamide, Quinine, Sulfadiazine Pyrazinamide. Linear Sweep Voltammetry (LSV) curves were obtained the a O2 saturated 0.1 M potassium phosphate buffer KCl solution Rotating...
Platinum group metal-free (PGM-free) catalysts based on M-N-C types of materials with M as Mn, Fe, Co and Ni aminoantipyrine (AAPyr) N-C precursors were synthesized using sacrificial support method. Catalysts kinetics oxygen reduction reaction (ORR) was studied rotating ring disk electrode (RRDE) in neutral pH. Results showed that performances distributed among the as: Fe-AAPyr > Co-AAPyr Mn-AAPyr Ni-AAPyr. had highest onset potential half-wave potential. All similar limiting current. an...
Platinum group metal-free (PGM-free) ORR catalysts from the Fe-N-C family were synthesized using sacrificial support method (SSM) technique. Six experimental steps used during synthesis: 1) mixing precursor, metal salt, and silica template; 2) first pyrolysis in hydrogen rich atmosphere; 3) ball milling; 4) etching template harsh acids environment; 5) second ammonia 6) final milling. Three independent batches fabricated following same procedure. The effect of each synthetic parameters on...
Hydroxide exchange membrane fuel cells (HEMFC) are a promising power source for automobiles due to their low cost. Here we focus on improving the beginning-of-life performance of HEMFCs higher level with poly(aryl piperidinium) (PAP) membranes and ionomers. We find that lower RH backpressure in anode than cathode can eliminate flooding dryout so balanced water management be achieved. also PtRu/C is better catalyst Pt/Ketjen Black presence Ru Pt/Vulcan XC-72 its mass transport properties....
A comparison between different carbon-based gas-diffusion air-breathing cathodes for microbial fuel cells (MFCs) is presented in this work. micro-porous layer (MPL) based on carbon black (CB) and an activated (AC) were used as catalysts applied supporting materials, including cloth (CC), felt (CF), stainless steel (SS) forming cathode electrodes MFCs treating urine. Rotating ring disk electrode (RRDE) analyses done CB AC to: (i) understand the kinetics of carbonaceous catalysts; (ii)...
The effects of the synthesis steps a platinum group metal-free (PGM-free) catalyst on surface chemistry, morphology, and electrochemical activity in acidic alkaline media toward oxygen reduction reaction (ORR) were studied. Each step exhibits positive impact activity. In acid media, etching silica template is major contributor to enhancement half-wave potential, as ORR active sites formed during first pyrolysis become more accessible. Further processing result even higher accessibility...
The effect of tris(hydroxymethyl)aminomethane (Tris) on the activity metal–nitrogen–carbon (M–N–C) platinum metal group-free (PGM-free) catalysts for oxygen reduction reaction (ORR) is studied. Electrochemical tests performed in acidic and alkaline electrolyte comparison between electrochemical observations metal-free metal-containing along with density functional calculations showed multiplex mechanism which numerous species perform partial full to peroxide or water, respectively. important...
Ni-La electrocatalytic systems have been synthesized via spray pyrolysis and studied for the electrooxidation of hydrazine hydrate in alkaline media. Characterization phase compositions, crystal structures, morphologies, surface compositions electrocatalysts performed XRD, SEM, HRTEM, XPS combination with situ IRRAS spectroelectrochemistry permitted further understanding high electrochemical activity obtained from (lanthanum hydroxide) catalytic systems. Ni0.90La0.10 Ni0.95La0.05 identified...
Ion-exchange capacity (IEC) is the measure of a material’s capability to displace ions formerly incorporated within its structure. IEC key feature anion-exchange membranes (AEM), as it determines AEM’s ability conduct required sustain electrochemical reactions where they are utilized. As an intrinsic property, measuring accurately essential study AEMs and understand their performance devices. In this method article, facile accurate standard operating procedure (SOP) proposed. When compared...
Abstract Catalytic activity toward the oxygen reduction reaction (ORR) of platinum group metal‐free (PGM‐free) electrocatalysts integrated with an enzyme (bilirubin oxidase, BOx) in neutral media was studied. The effects chemical and morphological characteristics PGM‐free materials on enhancement overall ORR kinetics investigated. surface chemistry catalyst studied using X‐ray Photoelectron Spectroscopy. Catalyst morphology characterized two independent methods: length‐scale specific image...
Bioelectrochemical systems (BESs) are novel that utilize biological reactions coupled with electrochemical for organics removal [1], electricity production [1,2] or product/nutrients recovery [2]. Specific attention was dedicated to the electrodes materials improvements. The anode material selected is usually based on three-dimensional conductive carbonaceous in order respond necessary features needs optimum oxidation reaction. Particularly, has be: i) electrically conductive, ii)...
The first commercial sales of fuel cell automobiles based on high-performance proton exchange membrane cells (PEMFCs) mark an important milestone for the field, bringing to market a zero-emission vehicle with advantages long driving range and short refuelling time. 1 Chiefly due use Pt electrocatalysts in PEMFCs, they are not yet cost competitive gasoline engines. Thus, further reductions needed facilitate PEMFCs’ wider adoption. Current efforts have been focused reduction loading electrode...
Reversible fuel cells have advantages over rechargeable batteries due to their high energy density, minimal self-discharge, and low cost. hydroxide exchange membrane (HEMFCs) are attractive ability work with platinum-group-metal (PGM)-free catalysts. HEMFCs electrolyzers (HEMELs) been separately studied. However, it remains a challenge integrate the two into single reversible cell. The major factors that limit development of unitized performance bifunctional oxygen catalysts, stability, ion...
The fuel cell technology has the capabilities to satisfy high-energy demand that our modern lifestyle requires. Fuel cells have been used for transportation, stationary power systems and electronic devices among others. One of main concerns regarding this promising is high cost low availability some materials are their constituents, specifically catalysts. Looking forward solve problem, several groups developed alternative Non-platinum metal group catalystsare a novel type materials, which...