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Developing efficient approaches for selective oxidation of arene C–H bonds has been a challenging goal. Here we reported a facile and practical strategy to fabricate the N-doped reduced graphene oxide...

Highly efficient platinum-group metal (PGM)free electrocatalysts are essential for the large-scale utilization of Zn-air batteries (ZABs). Herein, we report the simple fabrication of a single atomic PGM-free electrocatalyst, Fe-SA/N-C, via a post-synthetic electrostatic absorption (PSEA) strategy. The single Fe atoms are anchored on the three-dimensiaonal (3D) porous carbon with adjacent N atoms, forming atomic Fe-N 4 active sites. Fe-SA/N-C exhibits excellent ORR activity in 0.1 mol L −1 KOH aqueous solution (E 1/2 = 0.92 V) and 0.5 mol L −1 H 2 SO 4 aqueous solution (E 1/2 = 0.77 V), superior to those of commercial Pt/C (0.85 and 0.79 V, respectively). As a proof of concept, homemade liquid ZAB with Fe-SA/N-C catalyst displays outstanding discharging specific capacity and peak power density, outperforming the commercial Pt/C. According to the density functional theory calculation, the Fe-N 4 sites with graphitic N dopant can improve the activation of intermediates and decrease the energy barrier of the rate-determining step. This work highlights new insights for the experimental and theoretical guidance of PGM-free electrocatalysts and prescribes a general strategy for the rational design of PGM-free electrocatalysts used in ZABs.

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