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E-Mail IMAGE: ORNL researchers used electron beam powder bed fusion to produce refractory metal molybdenum, which remained crack free and dense, proving its viability for additive manufacturing applications. view more Credit: ORNL/U.S. Dept. of Energy Manufacturing - Mighty Mo Oak Ridge National Laboratory scientists proved molybdenum titanium carbide, a refractory metal alloy that can withstand extreme temperature environments, can also be crack free and dense when produced with electron beam powder bed fusion. Their finding indicates the material s viability in additive manufacturing. Molybdenum, or Mo, as well as associated alloys, are difficult to process through traditional manufacturing because of their high melting temperature, reactivity with oxygen and brittleness. ....
Reading time ( words) Oak Ridge National Laboratory scientists demonstrated that an electron microscope can be used to selectively remove carbon atoms from graphene’s atomically thin lattice and stitch transition-metal dopant atoms in their place. This method could open the door to making quantum building blocks that can interact to produce exotic electronic, magnetic and topological properties. This is the first precision positioning of transition-metal dopants in graphene. The produced graphene-dopant complexes can exhibit atomic-like behavior, inducing desired properties in the graphene. “What could you build if you could put any atoms exactly where you want? Just about anything,” ORNL’s Ondrej Dyck said. He co-led the study with Stephen Jesse at ORNL’s Center for Nanophase Materials Sciences. ....
E-Mail IMAGE: Transition metals stitched into graphene with an electron beam form promising quantum building blocks. view more Credit: Ondrej Dyck, Andrew Lupini and Jacob Swett/ORNL, U.S. Dept. of Energy Materials - Quantum building blocks Oak Ridge National Laboratory scientists demonstrated that an electron microscope can be used to selectively remove carbon atoms from graphene s atomically thin lattice and stitch transition-metal dopant atoms in their place. This method could open the door to making quantum building blocks that can interact to produce exotic electronic, magnetic and topological properties. This is the first precision positioning of transition-metal dopants in graphene. The produced graphene-dopant complexes can exhibit atomic-like behavior, inducing desired properties in the graphene. ....
PNNL-led team designs highly active cobalt-based PGM-free catalyst for fuel cells A multi-institutional research team led by materials scientists from Pacific Northwest National Laboratory (PNNL) has designed a highly active and durable catalyst that doesn’t rely on costly platinum group metals (PGM) to spur the necessary chemical reaction. The new catalyst contains cobalt interspersed with nitrogen and carbon. When compared to a similarly structured catalyst made from iron another promising, well-studied platinum substitute the team found that the cobalt catalyst achieved a similar reaction but with four times the durability. The research is published in Nature Catalysis. The development of catalysts free of platinum-group metals and with both a high activity and durability for the oxygen reduction reaction in proton exchange membrane fuel cells is a grand challenge. Here we report an atomically dispersed Co and N co-doped carbon (Co–N–C) catalyst with a hi ....
Stronger cobalt for fuel cells PNNL leads effort to improve reaction activity, increase durability of cobalt as a fuel cell catalyst DOE/Pacific Northwest National Laboratory By Mary Ann Showalter A multi-institutional research team led by materials scientists from Pacific Northwest National Laboratory (PNNL) has designed a highly active and durable catalyst that doesn t rely on costly platinum to spur the necessary chemical reaction. The new catalyst contains cobalt interspersed with nitrogen and carbon. When compared to a similarly structured catalyst made from iron another promising, well-studied platinum substitute, the team found that the cobalt catalyst achieved a similar reaction but with four times the durability. ....