The high cost of the platinum-based cathode catalysts for the oxygen reduction reaction (ORR) has impeded the widespread application of polymer electrolyte fuel cells. We report on a new family of non-precious metal catalysts based on ordered mesoporous porphyrinic carbons (M-OMPC; M = Fe, Co, or FeCo) with high surface areas and tunable pore structures, which were prepared by nanocasting mesoporous silica templates with metalloporphyrin precursors. The FeCo-OMPC catalyst exhibited an excellent ORR activity in an acidic medium, higher than other non-precious metal catalysts. It showed higher kinetic current at 0.9â€...V than Pt/C catalysts, as well as superior long-term durability and MeOH-tolerance. Density functional theory calculations in combination with extended X-ray absorption fine structure analysis revealed a weakening of the interaction between oxygen atom and FeCo-OMPC compared to Pt/C. This effect and high surface area of FeCo-OMPC appear responsible for its significantly high ORR activity.
|Original language||English (US)|
|State||Published - 2013|
Bibliographical noteKAUST Repository Item: Exported on 2021-09-21
Acknowledgements: S.H.J. was supported by the Basic Science Research Program through the National Research Foundation (NRF) of Korea, funded by the Ministry of Education (NRF-2013R1A1A2012960) and the TJ Park Junior Faculty Fellowship. G.-G.P. acknowledges the support from Korea Institute of Energy Research (KIER, B3-2415). R.R.A. was supported by U.S. Department of Energy (DOE), Divisions of Chemical and Material Sciences, under the Contract No. DE-AC02-98CH10886. O.T. acknowledges WCU (R-31-2008-000-10035-0, Korea), Berzelii EXSELENT and 3DEM-NATUR (Sweden) for financial support. K.K. was supported by Basic Science Research Program through the NRF funded by the Ministry of Education (NRF-2013R1A1A2010795). Z. Lee was supported by Mid-career Researcher Program through the NRF funded by the Ministry of Science, ICT & Future Planning (NRF-2011-0029412). J.Y.C. and Y.J.S. were supported by the National Junior Research Fellowship (NRF-2013H1A8A1003741) and the Global Ph.D. Fellowship (NRF-2013H1A2A1032644), respectively. The EXAFS experiments performed at Pohang Light Source (PLS) were supported in part by the Ministry of Education and POSTECH. We thank the National Energy Research Scientific Computing Center (NERSC) and KAUST Supercomputing Laboratory (KSL) for computational time and Prof. S. J. Hwang (Ewha Womans Univ.) and Prof. M. Choi (KAIST) for their help in EXAFS experiments.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
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