Center for Clean Energy Engineering

Sun City Center, United States

Center for Clean Energy Engineering

Sun City Center, United States
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Uddin M.A.,Center for Clean Energy Engineering | Aphale A.,Center for Clean Energy Engineering | Aphale A.,University of Connecticut | Hu B.,Center for Clean Energy Engineering | And 4 more authors.
ECS Transactions | Year: 2017

Incorporation of a porous and electrically conducting chromium getter layer, comprising of a mixture of complex metal oxide getter and electrically conducting perovskite phase, has been examined as a cost-effective approach for the capture of gaseous chromium species originating from the metallic interconnect alloys conventionally used in SOFC stacks. Getter layer deposited on the cathode surface or placed away from the cathode, was electrically tested in a half cell configuration (3%H2O-Air/Pt//YSZ//LSM/Getter/3%H2O-Air-CrOx) at 850°C for 100 hours. Post tested cells were analyzed for composition of reaction products and changes in the morphology. Our observations indicate that getter placed away from the cathode and conductive getter paste deposited on cathode surface successfully capture all chromium incoming with air stream thus mitigating the poisoning of the cathode without performance degradation. The gaseous chromium predominantly concentrated at the impinging getter surface and the bulk electrode and electrode-electrolyte interface remained free of chromium. © The Electrochemical Society.

Uddin Md.A.,Center for Clean Energy Engineering | Wang X.,Center for Clean Energy Engineering | Wang X.,University of Connecticut | Qi J.,Center for Clean Energy Engineering | And 5 more authors.
ECS Transactions | Year: 2013

The performance and durability of PEFCs were investigated by introducing HCl and five different chloride salts into the air stream of an operating fuel cell. Under the same operating conditions and at a constant 28.5 mM chloride (Cl-) concentration, cell performance degradation can be ranked as HCl> AlCl3 > FeCl3 > CrCl3 > NiCl2, MgCl2. Water evaporation in the flow field surface was found to be causing precipitation of chloride salts. At lower RH, water content decreased and salt deposits completely blocked some of flow channels and caused death of the fuel cell. Moreover, contaminants crossed the GDL, reached the CCM surface, and caused significant performance drop. © The Electrochemical Society.

News Article | November 7, 2016

EAST HARTFORD, Conn., Nov. 7, 2016 (GLOBE NEWSWIRE) -- The Connecticut Center for Advanced Technology Inc. (CCAT) was named an Environmental Partner Finalist for the 2013-2016 Environmental Leadership Award by the University of Connecticut Environmental Policy Advisory Council at an awards ceremony on October 25, 2016. The award distinguishes CCAT's dedication and contribution to environmental sustainability at UConn. The Environmental Leadership Awards were created by the university as a way to honor individuals as well as UConn-affiliated groups that have truly excelled in their efforts to contribute to environmental awareness and promote progress through their 'green' programs. According to the University of Connecticut Environmental Policy Advisory Council, CCAT was recognized for developing a Preliminary Feasibility Study and Strategic Deployment Plan for Renewable & Sustainable Energy Projects at the UConn campus in Storrs. "We are proud to be recognized by UConn for our work in supporting and expanding the university's renewable and sustainable energy efforts," stated Joel Rinebold, energy director, CCAT. "We look forward to continuing our collaboration with the university to spur the use of new energy technologies that will contribute to increased power and cost savings well into the future." The plan identified and assessed target locations for the development of 12 demonstration-scale renewable and sustainable energy projects for technologies, including solar thermal, solar photovoltaic, wind, fuel cells, geothermal, and biofuels. The deployment of renewable energy systems, as detailed in the plan, could support research efforts for power system planning, and integration of clean and renewable technologies into a smart grid. CCAT also assisted UConn by providing information and coordinating the development of the project feasibility application for the state's Microgrid Grant and Loan Pilot Program. CCAT is working with UConn to identify potential locations for hydrogen refueling stations at or near biomass sites that could potentially be used by state or other public or private-sector vehicle fleets. The potential sources of hydrogen would support zero-emission, fuel cell electric vehicles to increase transportation efficiency, improve environmental performance, increase economic development, and create new jobs. CCAT continues to team with the Center for Clean Energy Engineering (C2E2), the Institute for Materials Science, and others at UConn to consider anaerobic digestion, manufacturing supply chain, hydrogen production, materials/catalysts development, and use of renewables (wind) at UConn facilities. About CCAT Connecticut Center for Advanced Technology Inc. (CCAT) is a nonprofit organization, headquartered in East Hartford, Conn., that creates and executes bold ideas advancing applied technologies, IT strategies, energy solutions, STEM education, and career development. By leading state, regional, and national partnerships, CCAT helps manufacturers, academia, government and nonprofit organizations excel. Learn more at, or follow CCAT on Twitter - @CCATInc.

Kim S.,University of Connecticut | Kim S.,Center for Clean Energy Engineering | Myles T.D.,Center for Clean Energy Engineering | Kunz H.R.,University of Connecticut | And 7 more authors.
Electrochimica Acta | Year: 2015

The effects of polytetrafluoroethylene (PTFE) binder content in the catalyst layer of high temperature polymer electrolyte membrane fuel cells (HT-PEMFCs) utilizing phosphoric acid doped Advent TPS® polymer electrolyte membranes (pyridine bearing aromatic polyethers, TPS) has been investigated in terms of both hydrogen/oxygen and hydrogen/air performance. The anode and cathode gas diffusion electrodes (GDE) were fabricated with different PTFE/carbon weight ratios by a flame based process known as the Reactive Spray Deposition Technology (RSDT) method in order to increase the active platinum (Pt) surface area, with a goal of decreasing overall Pt levels to a total loading of 0.1 mg cm-2. The electrodes, prepared with different amounts of PTFE binder, have been tested in a single cell, with a 25 cm2 geometric area, under an operating temperature range of 160-200 °C. Tests measuring the Pt nanoparticle dispersion on the carbon supports, the pore size distribution, and the electrochemical surface area of the catalyst layer were also performed. The best cell performance was achieved with PTFE/carbon weight ratio of 0.9 over the entire range of operating temperatures. This optimal PTFE binder content resulted in well-developed Pt dispersion on the carbon support and small, uniformly sized pores which develop ideal capillary forces for distributing the phosphoric acid electrolyte evenly throughout the catalyst layer. This led to a high number of triple phase boundaries and maximized Pt utilization. © 2015 Elsevier Ltd.

Koehle M.,University of Connecticut | Koehle M.,Center for Clean Energy Engineering | Moreno A.M.,University of Connecticut | Moreno A.M.,Center for Clean Energy Engineering | And 2 more authors.
ACS National Meeting Book of Abstracts | Year: 2011

Processing of biomass-derived oxygenates, such as ethanol, glycerol, and bio-oil, has tremendous potential to generate H 2 fuel with no net CO 2 emissions, providing a clean, renewable, and sustainable fuel source. While extensive experimental research has been carried out on oxygenates reforming, there still lacks a comprehensive understanding of the underlying surface kinetics on an elementary reaction level due to the complexity of reforming chemistry for such large molecular systems. In this work, we will discuss the development of a comprehensive and predictive microkinetic model for catalytic reforming of ethanol, utilizing a combination of semi-empirical and first-principles methods as well as experiments to estimate the kinetic parameters for species and elementary reactions. Validation of the microkinetic model against experimental data and analysis of reaction pathways will be presented, along with the approaches for extension of this work to model larger oxygenates, such as glycerol and bio-oil.

Sharma H.,University of Connecticut | Sharma H.,Center for Clean Energy Engineering | Moreno A.M.,University of Connecticut | Moreno A.M.,Center for Clean Energy Engineering | And 2 more authors.
ACS National Meeting Book of Abstracts | Year: 2011

The precious metal-based Diesel oxidation catalyst (DOC) plays a fundamental role in reducing diesel fuel particulate matter and other harmful emissions such as hydrocarbons (HC), carbon monoxide (CO) and nitric oxides (NO x), which have adverse impact on human health and environment. Despite the extensive research on these catalysts, comprehensive and predictive kinetic models for simultaneous prediction of multiple emissions oxidation are lacking. In this work, a detailed elementary step microkinetic model for oxidation of CO, NO, other nitrogen containing emissions (NH3 and HCN) as well as toxic aldehydes (CH 2O) is developed. The detailed mechanism development is carried out using several parameter estimation techniques: semi-empirical Unity Bond Index-Quadratic Exponential Potential (UBI-QEP), Transition State Theory (TST), quantum mechanical Density Functional Theory (DFT), and temperature programmed experiments. Model predictions for catalytic oxidation of various emission components will be discussed as a function of operating conditions (see Figure for HCN oxidation).

Hewage N.,University of Connecticut | Yang B.,University of Connecticut | Yang B.,Center for Clean Energy Engineering | Agrios A.G.,University of Connecticut | And 2 more authors.
Dyes and Pigments | Year: 2015

Alkyl- or aryl-carboxylic acid-functionalized porphyrinic dyes are sought after because of their propensity to adhere strongly to many metal oxide surfaces as required for their application as, for instance, sensitizers in dye-sensitized solar cells (DSSCs), in air purification, or chemosensing systems. The SNAr reaction of the pentafluorophenyl group is a versatile method to introduce functionality into meso-pentafluorophenyl-substituted porphyrins. The conditions to introduce one through four alkyl- or aryl-carboxyl functionalities using mercaptopropionate or 3,4-dihydroxybenzoate esters, respectively, are explored, and the regioisomeric products are spectroscopically characterized. Their saponification to the corresponding carboxylic acids was studied. By experimental determination of their optical properties (absorption and emission spectroscopy) and their frontier orbital positions by cyclic voltammetry, we demonstrate the minimal electronic influence this derivatization method has on the chromophore. © 2015 Elsevier Ltd. All rights reserved.

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