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In this paper, gadolinia-doped ceria (GDC), which is a highly catalyzed oxide ionic conductor, was explored to further improve oxygen surface reaction rates using a grain-controlled layer (GCL) concept. Typically, GDC materials have been used as a cathode functional layer by coating the GDC between the electrode and electrolyte to accelerate the oxygen reduction reaction (ORR). To further improve the oxygen surface kinetics of the GDC cathodic layer, we modified the grain boundary density and crystallinity developed in the GDC layer by controlling RF power conditions during the sputtering process. This approach revealed that engineered nano-grains of GDC thin films directly affected ORR kinetics by catalyzing the oxygen surface reaction rate, significantly enhancing the fuel cell performance. Using this innovative concept, the fuel cells fabricated with a GDC GCL demonstrated a peak power density of 240 mW/cm2 at 450oC.
This article was published in the following journal.
Name: ACS applied materials & interfaces
Iridates are of considerable current interest because of the strong spin-orbit coupling that leads to a variety of new phenomena. %The strong spin-orbit coupled iridates are of cons...
The technological feasibility of electrophoretic deposition (EPD) of gadolinium doped ceria (GDC) on polypyrrole (PPy) coated yttrium stabilized zirconia (YSZ) has been reported. To enhance the EPD te...
This study examined the relationship between surface oxygen vacancies (OVs) and ceria-based heterogeneous Fenton catalytic activity. Compared with pure iron oxide and ceria, iron-doped ceria with abun...
The mobility of oxygen ions at surfaces and interfaces in solid oxide fuel materials is controversial. Experiments are complex and conflicting results for grain boundary and surface O2- diffusion have...
Platinum atomic layers grown on graphene were investigated by atomic resolution transmission electron microscopy (TEM). These TEM images reveal the epitaxial relationship between the atomically thin p...
The primary objective of this study is to identify markers of daily whole grain oat and whole grain wheat intake in humans.
The primary objective of this study is to identify markers of a single meal of whole grain oat and whole grain wheat intake in humans.
A diet rich in whole grain is inversely associated with cardiovascular disease risk and this benefit could be partly attributed to the phenolic acid content of whole grains. The exact abso...
The purpose of the study is to investigate, in healthy middle age subjects, effects of whole grain rye on cognitive functions, mood, and cardiovasculair risk markers
This study investigates the health benefits of whole grain wheat on cardiovascular/ cardio-metabolic health, including glucose metabolism, by means of applying a mixed meal challenge. This...
Cells lining the outside of the BLASTOCYST. After binding to the ENDOMETRIUM, trophoblasts develop into two distinct layers, an inner layer of mononuclear cytotrophoblasts and an outer layer of continuous multinuclear cytoplasm, the syncytiotrophoblasts, which form the early fetal-maternal interface (PLACENTA).
A 3D printing technology where a computer-controlled moving laser beam is used to build up the required structure, layer by layer, from liquid POLYMERS that harden on contact with laser light (photopolymerization).
SEEDS used as a major nutritional source, most often the grain from the POACEAE family.
Reducing the SURFACE TENSION at a liquid/solid interface by the application of an electric current across the interface thereby enhancing the WETTABILITY of the surface.
The external, nonvascular layer of the skin. It is made up, from within outward, of five layers of EPITHELIUM: (1) basal layer (stratum basale epidermidis); (2) spinous layer (stratum spinosum epidermidis); (3) granular layer (stratum granulosum epidermidis); (4) clear layer (stratum lucidum epidermidis); and (5) horny layer (stratum corneum epidermidis).