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Accepted Manuscripts

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research-article  
Takahide Haneda and Atsushi Akisawa
J. Electrochem. En. Conv. Stor.   doi: 10.1115/1.4036956
The potential of an energy system that comprises a hydrogen-fueled PEFC, a steam reformer and a hydrogen storage tank, using surplus hydrogen produced from an oil refinery was evaluated using a mathematical model based on linear programming. Based on the optimization results to minimize the system cost by optimizing the capacity of the hydrogen -fueled PEFC, the hydrogen production of steam reformer, the storage and release of hydrogen storage tank and CO2 reduction effect were calculated in relation to the power generation efficiency and the installation cost of the hydrogen -fueled PEFC. As a result, the conditions for the hydrogen-fueled PEFC where a system cost reduction could be achieved in the PEFC power generation system, compared with the conventional system, were clearly shown to be an initial cost lower than 3,000 $/kW for a power generation efficiency of 50 % or an initial cost lower than 5,000 $/kW for a power generation efficiency of 65 %.
TOPICS: Energy / power systems, Hydrogen, Energy generation, Hydrogen storage, Steam, Storage, Linear programming, Hydrogen production, Optimization, Carbon dioxide
research-article  
Yufeng Qiu, Jian Pu, Jian Li, Yihui Liu and Bin Hua
J. Electrochem. En. Conv. Stor.   doi: 10.1115/1.4036812
The chemical stability of La1-xSrxCo0.2Fe0.8O3-d (x=0, 0.4, 0.6, 1) oxides before and after annealing at 750 °C in air is investigated by field emission scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), auger electron spectroscopy (AES) and environmental transmission electron microscopy (TEM). Results indicate that Sr surface segregation has initially occurred at the sintering stage, and then the secondary-phase particles are formed with increasing time during annealing at 750 °C in air. Increasing Sr content accelerates Sr segregation on the surface, because of two driving forces including elastic/electrostatic stresses in the crystal lattice and thermal activation. AES and XPS results reveal that Sr and Co segregations toward the surface have great contributions to the chemical instability of LSCF related to annealing.
TOPICS: Intermediate temperature solid oxide fuel cells, Chemical stability, Annealing, Sintering, Stress, Augers, Crystal lattices, Electron spectroscopy, Photoelectron spectroscopy, Scanning electron microscopy, Electron field emission, Transmission electron microscopy, X-rays, Particulate matter
research-article  
Adriana Marinoiu, Mircea Raceanu, Elena Carcadea, Mihai Varlam, Danut Balan, Daniela Ebrasu, Ioan Stefanescu and Marius Enachescu
J. Electrochem. En. Conv. Stor.   doi: 10.1115/1.4036684
We prepared iodine-doped graphenes by several techniques (electrophilic substitution and nucleophilic substitution methods) in order to incorporate iodine atoms onto the graphene base materials. The physical characterization of prepared samples was performed by using an array of different techniques, such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and electrochemical methods. A series of cathodes using I-doped graphene were prepared and evaluated. Electrochemical performances of the cathodes with and without I-doped graphene indicated an effective improvement, resulting a better mass transport in the catalyst layer.
TOPICS: Graphene, Oxygen, Proton exchange membrane fuel cells, Transmission electron microscopy, X-rays, Atoms, Photoelectron spectroscopy, Scanning electron microscopy, Catalysts

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