期刊
ACS NANO
卷 7, 期 6, 页码 4919-4923出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn400156y
关键词
block copolymer lithography; micelle encapsulation; rhodium; catalysis; solid-oxide fuel cells; anode
类别
资金
- National Science Foundation through the Caltech Center for the Science and Engineering of Materials, a Materials Research Science and Engineering Center [DMR-0520565]
We present a method for forming ordered rhodium nanostructures on a solid support. The approach makes use of a block copolymer to create and assemble rhodium chloride nanoparticles from solution onto a surface; subsequent plasma and thermal processing are employed to remove the polymer and fully convert the nanostructures to metallic rhodium. Films cast from a solution of the triblock copolymer poly(styrene-b-2-vinyl pyridine-b-ethylene oxide) dissolved in toluene with rhodium(III) chloride hydrate were capable of producing a monolayer of rhodium nanoparticles of uniform size and interparticle spacing. The nanostructures were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, and atomic force microscopy. The electrocatalytic performance of the nanoparticles was investigated with AC impedance spectroscopy. We observed that the addition of the particles to a model solid oxide fuel cell anode provided up to a 14-fold improvement in the anode activity as evidenced by a decrease in the AC impedance resistance. Examination of the anode after electrochemical measurement revealed that the basic morphology and distribution of the particles were preserved.
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