Highly active iron-nitrogen-boron-carbon bifunctional electrocatalytic platform for hydrogen peroxide sensing and oxygen reduction
2021
Cao, Yue | Zhang, Wei | Sun, Yegeng | Jiang, Yuhang | Han, Ning | Zou, Jiexin | Si, Weimeng | Wang, Fagang | Núñez Delgado, Avelino | Lau, R. S. M. (Ronald S. M.)
An iron-nitrogen-boron-carbon (Fe–N–B–C) bifunctional electrocatalyst was prepared by means of a facile one-step hydrothermal reduction of graphene oxide using dimethylamine borane as doping agent. In addition, hemins were efficiently anchored during doping/reducing process on this modified graphene. The as-prepared Fe–N–B–C electro-catalyst showed enhanced response as regards its potential for reduction of H₂O₂ and O₂. In view of its catalytic activity, this Fe–N–B–C material was tested for the determination of H₂O₂ with a chronoamperometry method, obtaining a detection limit as low as 0.055 μM, which is better than that of some Hemin-N-C materials. Regarding O₂ reduction reaction, a study performed using a rotating disk electrode indicated that this material exhibits a positive onset potential (0.90V vs. RHE), high selectivity (4e⁻ process), high limiting-current density (4.75 mA cm⁻²) and strong resistance against the crossover-effect from methanol in alkaline medium, making it to be the promising candidate as alternative for commercial Pt/C catalysts. These results could have commercial and environmental relevance and would deserve further complementary investigation.
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