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Designing Better Electrocatalysts for Fuel Cells

Both the soaring price of gasoline and concerns about global warming make research on improving electrocatalysts for use in fuel cells for electric vehicles especially relevant today.

Radoslav Adzic, a senior chemist in the Chemistry Department, is currently host to two visitors who are performing basic research in this area: Yuji Ando, research scientist from the National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan; and Wei-Fu Chen, a graduate student from National Cheng Kung University, Tainan City, Taiwan.

Photo of Ando, Chen and Adzic

BNL visitors Yuji Ando (left) and Wei-Fu Chen with the Chemistry Department's Radoslav Adzic (right).

Ando is investigating new syntheses of carbon-supported platinum on ruthenium for use as an electrocatalyst to speed up oxidation of methanol in fuel cells. A methanol fuel cell may be used to power portable electronics, such as computers and cell phones, in the near future. Such technology would provide power continuously with a simple change of a methanol cartridge, and it would be more efficient and lightweight than the batteries now used in such devices. The ultimate goal of Ando's basic research, however, is to find the most efficient and inexpensive electrocatalyst for fuel cells.

While platinum is the most efficient electocatalyst for accelerating oxygen reduction at the fuel cell cathode to be used in electric cars, it is expensive, and still not stable or efficient enough to be used during stop-and-go driving, a major impediment. Chen is investigating the efficiency of a platinum monolayer by placing it on a stable metal or alloy clusters. His goal is to develop improved electrocatalysts that will facilitate the application of platinum in fuel-cell cathode electrocatalysts.

Adzic designed the first platinum monolayer fuel-cell anode electrocatalyst, which consists of ruthenium nanoparticles with a sub-monolayer of platinum. He then used this same concept to design a platinum monolayer cathode electrocatalyst, which contains several times less platinum than commercial electrocatalysts, thus making it less costly. Chen is investigating new nanoparticle supports for the platinum monolayer that will produce less costly and more stable electrocatalysts.

Ando will be working at BNL until December, and Chen will be on site until November, completing his thesis for his Ph.D. Currently working in the Chemistry Department, both researchers also use facilities at the Center for Functional Nanomaterials and the National Synchrotron Light Source for their work.

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