fuel cells tagged posts

Using Nanotechnology to give Fuel Cells more Oomph

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Nanofiber mat electrode (John Russell / Vanderbilt)

The project is part of a $13 million Department of Energy program to advance fuel cell performance and durability and hydrogen storage technologies announced last month. The $4.5 million collaboration is based on a new nanofiber mat technology developed by Peter Pintauro, the H. Eugene McBrayer Professor of Chemical Engineering at Vanderbilt, that replaces the conventional electrodes used in fuel cells. The nanofiber electrodes boost the power output of fuel cells by 30% while being less expensive and more durable than conventional catalyst layers...

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Making Nail Polish while Powering Fuel Cells

Researchers have found a way to make the valuable chemical ethyl acetate while generating H2 gas to power fuel cells. CREDIT Nanfeng Zheng

Researchers have found a way to make the valuable chemical ethyl acetate while generating H2 gas to power fuel cells.
CREDIT
Nanfeng Zheng

Hydrogen is widely regarded as a promising and clean alternative energy source. The traditional source of hydrogen (H2) for fuel cell use is water, which is split into H2 and oxygen (O2). But O2 is a low-value product. So, this week in ACS Central Science, researchers report a new approach and a new catalyst that can produce not just hydrogen but also valuable chemicals, including the most common ingredient in nail polish.

Nanfeng Zheng and colleagues recognized that to produce H2, it is necessary to have a source that contains both hydrogen and oxygen. Although water is the typical source, other substances could also fit the bill...

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Alternative to Platinum: Iron-Nitrogen compounds as Catalysts in Graphene

Today, most metal and nitrogen doped carbon catalysts for ORR reveal a heterogeneous composition. This can be reasoned by a nonoptimized precursor composition and various steps in the preparation process to get the required active material. The significant presence of inorganic metal species interferes with the assignment of descriptors related to the ORR activity and stability. In this work we present a simple and feasible way to reduce the contribution of inorganic metal species in some cases even down to zero. Such catalysts reveal the desired homogeneous composition of MeN4 (Me = metal) sites in the carbon that is accompanied by a significant enhancement in ORR activity. Among the work of other international groups, our iron-based catalyst comprises the highest density of FeN4 sites ever reported without interference of inorganic metal sites.

Today, most metal and nitrogen doped carbon catalysts for ORR reveal a heterogeneous composition. This can be reasoned by a nonoptimized precursor composition and various steps in the preparation process to get the required active material. The significant presence of inorganic metal species interferes with the assignment of descriptors related to the ORR activity and stability. In this work we present a simple and feasible way to reduce the contribution of inorganic metal species in some cases even down to zero. Such catalysts reveal the desired homogeneous composition of MeN4 (Me = metal) sites in the carbon that is accompanied by a significant enhancement in ORR activity...

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