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High Hydrogen Evolution Reaction (HER) and Hydrogen Oxidation Reaction (HOR) Activity Rh x S y Catalyst Synthesized with Na 2 S for Hydrogen-Bromine Fuel Cell

Author

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  • Yuanchao Li

    (Chemical and Petroleum Engineering Department of University of Kansas, University of Kansas, Lawrence, KS 66045, USA)

  • Trung Van Nguyen

    (Chemical and Petroleum Engineering Department of University of Kansas, University of Kansas, Lawrence, KS 66045, USA)

Abstract

A Rh x S y /C catalyst with high mass-specific electrochemical surface area (ECSA/mass), high hydrogen oxidation reaction (HOR)/hydrogen evolution reaction (HER) activity, and high Nafion ® ionomer-affinity was synthesized and evaluated. A new sulfur source, Na 2 S instead of (NH 4 ) 2 S 2 O 3 , was applied to prepare the rhodium sulfide precursor Rh 2 S 3 that resulted in a Rh x S y catalyst with higher HOR/HER catalytic activity after thermal treatment. The higher activity was attributed to the higher quantity formation of the more active phase Rh 3 S 4, in addition to the other active Rh 17 S 15 phase, in the Rh x S y catalyst. Using this new sulfur source, carbon substrate functionalization, and the mass-transfer-controlled nanoparticle growth process, the average particle size of this catalyst was reduced from 13.5 nm to 3.2 nm, and its ECSA/mass was increased from 9.3 m 2 /g-Rh to 43.0 m 2 /g-Rh. Finally, by applying the Baeyer–Villiger and ester hydrolysis process to convert the Nafion ® ionomer-unfriendly ketone group on the carbon support surface to the Nafion ionomer-friendly carboxylic group, which increases the Nafion ® affinity of this catalyst, its use in the hydrogen electrode of an H 2 -Br 2 fuel cell resulted in a performance that is 2.5× higher than that of the fuel cell with a commercial Rh x S y catalyst.

Suggested Citation

  • Yuanchao Li & Trung Van Nguyen, 2020. "High Hydrogen Evolution Reaction (HER) and Hydrogen Oxidation Reaction (HOR) Activity Rh x S y Catalyst Synthesized with Na 2 S for Hydrogen-Bromine Fuel Cell," Energies, MDPI, vol. 13(15), pages 1-17, August.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:15:p:3971-:d:393437
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    References listed on IDEAS

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    1. Hosseini, Seyed Ehsan & Andwari, Amin Mahmoudzadeh & Wahid, Mazlan Abdul & Bagheri, Ghobad, 2013. "A review on green energy potentials in Iran," Renewable and Sustainable Energy Reviews, Elsevier, vol. 27(C), pages 533-545.
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