Novel Heteroatom-Doped Fe/N/C Electrocatalysts With Superior Activities for Oxygen Reduction Reaction in Both Acid and Alkaline Solutions

Frontiers in Chemistry
Muhammad RaufYongliang Li

Abstract

The exploration of noble metal-free catalysts with efficient electrochemical performance toward oxygen reduction reaction in the acid electrolyte is very important for the development of fuel cells technology. Novel pyrolyzed heteroatom-doped Fe/N/C catalysts have been regarded as the most efficient electrocatalytic materials for ORR due to their tunable electronic structure, and distinctive chemical and physical properties. Herein, nitrogen- and sulfur-doped (Fe/N/C and Fe/N/C-S) electrocatalysts were synthesized using ferric chloride hexahydrate as the Fe precursor, N-rich polymer as N precursor, and Ketjen Black EC-600 (KJ600) as the carbon supports. Among these electrocatalysts, the as prepared S and N-doped Fe/N/C-S reveals the paramount ORR activity with a positive half-wave potential value (E1/2) 0.82 at 0.80 V vs. RHE in 0.1 mol/L H2SO4 solution, which is comparable to the commercial Pt/C (Pt 20 wt%) electrocatalyst. The mass activity of the Fe/N/C-S catalyst can reach 45% (12.7 A g-1 at 0.8 V) and 70% (5.3 A g-1 at 0.95 V) of the Pt/C electrocatalyst in acidic and alkaline solutions. As result, ORR activity of PGM-free electrocatalysts measured by the rotating-ring disk electrode method increases in the following order...Continue Reading

References

Oct 13, 2009·Journal of the American Chemical Society·Xiaolin LiHongjie Dai
Jul 3, 2013·Accounts of Chemical Research·Gang Wu, Piotr Zelenay
May 13, 2014·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Urszula TylusSanjeev Mukerjee
May 6, 2015·Chemical Reviews·Liming DaiJong-Beom Baek
Feb 1, 2018·Chemical Reviews·Andrew A GewirthAngela M DiAscro
Dec 20, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Xinxin YangYongliang Li

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Citations

Nov 12, 2020·Frontiers in Chemistry·Zexing WuGengtao Fu

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Methods Mentioned

BETA
transmission electron microscopy
X-ray
acid leaching

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