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Article Dans Une Revue Electrocatalysis Année : 2020

Oxygen Reduction Reaction on Metal and Nitrogen-Doped Carbon Electrocatalysts in the Presence of Sodium Borohydride

Résumé

Metal and nitrogen-doped carbons electrocatalysts (M-N-C, where M is Fe or Co) are investigated for the oxygen reduction reaction (ORR) in alkaline conditions in the presence of borohydride ions (BH4-). The electrochemical properties of the Fe-N-C and Co-N-C catalysts were investigated by cyclic voltammetry and rotating disk electrode techniques: their ORR electrocatalytic activity was bridged to their physico-chemical properties, mainly type of metallic center (Fe vs. Co), structure (atomic dispersion vs. nanoparticles) and BET surface area. It is found that Fe-N-C catalysts have the best performances for the ORR electrocatalysis, even in presence of BH4- anions. The atomically-dispersed Fe- and Co-containing electrocatalysts reach better BH4--tolerance than their counterparts baring nanoparticles. For the atomically dispersed Fe-N-C electrocatalysts, the lowest BET surface area material generates a slight advantage of ORR mass activity and a poor (and desired) activity for borohydride oxidation reaction (BOR).

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Catalyse Matériaux
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Dates et versions

hal-02931375 , version 1 (08-09-2020)

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Ricardo Sgarbi, Edson Ticianelli, Frédéric Maillard, Frederic Jaouen, Marian Chatenet. Oxygen Reduction Reaction on Metal and Nitrogen-Doped Carbon Electrocatalysts in the Presence of Sodium Borohydride. Electrocatalysis, 2020, 11 (4), pp.365-373. ⟨10.1007/s12678-020-00602-1⟩. ⟨hal-02931375⟩
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