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The reaction pathways of the oxygen reduction reaction on IrN 4 doped divacancy graphene: A theoretical study.
Journal of Molecular Graphics & Modelling 2018 March
The transition metal and nitrogen co-doped graphene as efficient electrocatalysts of oxygen reduction reaction (ORR) is promising to achieve large-scale applications of the full cells. In this work, we investigated the active sites and ORR mechanism on IrN4 doped divacancy graphene (IrN4 -Gra) by using the density functional method. The active sites are identified as the IrN4 moiety and its adjacent ten C atoms. ORR on IrN4 -Gra is a four-electron process. OOH hydrogenated into OH + OH is the kinetically most favorable pathway. The rate-determining step is OOH + H → OH + OH with energy barrier 1.01 eV. The predicted working potential is 0.41 V. Hence, IrN4 -Gra might be a promising ORR catalyst.
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