Electrospray ionization mass spectrometric analyses of rhodium tetraphenylporphyrin complexes as electrocatalysts for CO oxidation by tandem mass spectrometry and hyphenated method with capillary electrophoresis

Rapid Communications in Mass Spectrometry : RCM
Sahori Takeda, Shin-ichi Yamazaki

Abstract

Carbon monoxide (CO) poisoning of platinum (Pt)-based electrocatalysts is a huge obstacle in the development of proton-exchange membrane fuel cells. Fuel cell performance can be improved by removing CO through electrolytic oxidation. Yamazaki et al. synthesized several rhodium (Rh) tetraphenylporphyrin complexes as electrocatalysts to reduce CO poisoning. Experimental results showed that these complexes display higher electrochemical CO oxidation activity than previously synthesized Rh octaethylporphyrin complex and that the differences in the structures of p-substituted groups influence their activity. To confirm the formation of these Rh tetraphenylporphyrin complexes, analyses were performed using electrospray ionization mass spectrometry (ESI-MS), electrospray ionization tandem mass spectrometry (ESI-MS/MS), and capillary electrophoresis-electrospray ionization mass spectrometry (CE-ESI-MS). In ESI-MS, peaks other than that of the Rh tetraphenylporphyrin complex were occasionally detected at different m/z values. The ESI-MS/MS and CE-ESI-MS results suggest that these peaks correspond to the complexes coordinating CO or other ions, or to remaining uncoordinated tetraphenylporphyrins. Coordination of CO is supported by the ES...Continue Reading

References

Mar 23, 2007·Journal of Chromatography. a·Maria Rowena N Monton, Tomoyoshi Soga
Mar 18, 2009·Physical Chemistry Chemical Physics : PCCP·Hiroyuki UchidaMasahiro Watanabe
Dec 22, 2009·Physical Chemistry Chemical Physics : PCCP·Matthew P GoslingMartin C R Cockett
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Feb 11, 2010·Physical Chemistry Chemical Physics : PCCP·Tatsuya KameyamaTsukasa Torimoto
Jun 10, 2010·Physical Chemistry Chemical Physics : PCCP·Shin-ichi YamazakiKazuaki Yasuda
Sep 1, 1996·Journal of the American Society for Mass Spectrometry·A Rosell-MeléJ R Maxwell

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Citations

Dec 1, 2011·Electrophoresis·Petr Kubáň, Andrei R Timerbaev

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