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Enhanced stability for oxygen reduction reaction of supported platinum-based catalyst with Fe-N doped activated carbon as carbon support |
Maohui LI1,2, Zhi YANG1, Tingxian PAN1,2, Xin TONG1,2, Changgang HU1,2, Juan TIAN1,2,*( ) |
1 School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, China 2 Key Laboratory of Functional Materials and Chemistry of Guizhou Province, Guiyang 550001, China |
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Abstract Modification and doping of carbon support are the main ways to improve the performance of the platinum-based catalyst for proton exchange membrane fuel cell. FeN-BP.Iron and nitrogen(FeN) co-doped activated carbon (Black Pearl 2000, BP) as a support, was used as the support of platinum-based catalyst for oxygen reduction reaction (ORR). The activity and stability of the catalysts were tested by electrochemical techniques, and the structure of the catalysts were characterized by X-ray diffraction, specific surface area and pore size distribution test, transmission electron microscopy, X-ray photoelectron spectroscopy. The results show that Pt/FeN-BP and commercial Pt/C catalyst have comparable initial ORR activity with onset potential 0.94 V. After accelerated degradation test, the lost of onset potential for Pt/FeN-BP catalyst and commercial Pt/C catalyst are about 10 mV and 30 mV, as well as the lost of half-wave potential are about 5 mV and 60 mV.Pt/FeN-BP catalyst shows obvious improved stability.The high surface area and the moderate pore size distribution of FeN-BP, the small size and well dispersion of Pt nanoparticles on carbon after accelerated degradation test, as well as the interaction between carbon support and Pt nanoparticles may the key reasons for Pt/FeN-BP with improved stability.
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Received: 16 March 2021
Published: 18 April 2022
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Corresponding Authors:
Juan TIAN
E-mail: juan_tian@126.com
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N2 adsorption-desorption isotherms of BP and FeN-BP carbon supports
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Sample | SBET/(m2·g-1) | Pore volume/(cm3·g-1) | Average pore size/nm | BP | 1507.77 | 2.74 | 7.28 | FeN-BP | 979.75 | 2.09 | 8.56 |
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surface area, pore volume and average pore size of BP and FeN-BP carbon supports
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XRD patterns of Pt/BP, Pt/FeN-BP and commercial Pt/C catalysts
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ORR polarization curves of Pt/BP, Pt/FeN-BP and commercial Pt/C catalysts
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ORR polarization curves of Pt/FeN-BP and commercial Pt/C catalysts before and after ADT
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ECSA with cycling numbers of Pt/FeN-BP and commercial Pt/C catalysts
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XPS spectra and deconvolution of Pt4f peak of Pt/FeN-BP and commercial Pt/C catalysts(a), XPS spectra and deconvolution of N1s peak of Pt/FeN-BP catalysts(b)
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TEM images of commercial Pt/C and Pt/FeN-BP catalysts before(1) and after(2) ADT (a)commercial Pt/C; (b)Pt/FeN-BP
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Sample | Particle size/nm | Before ADT | After ADT | Pt/C | 2.80 | 4.02 | Pt/FeN-BP | 1.99 | 3.23 |
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Average particle size of platinum for commercial Pt/C and Pt/FeN-BP catalysts before and after ADT
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