Highly exposed surface pore-edge FeNx sites for enhanced oxygen reduction performance in Zn-air batteries

Atomically dispersed pore-edge FeNx sites anchored on porous carbon exhibit excellent activity and stability towards ORR. The assembled Zn-air battery presents a high peak power density (150 mW cm−2) and long-cycle stability (450 h).

A facile synthesis of an Fe/N-doped ultrathin carbon sheet for highly efficient oxygen reduction reaction

Fe/N-Doped ultrathin carbon sheet was synthesized. Fe₃C/NC-800 exhibited an outstanding behavior toward ORR catalysis with a catalyst loading of 150 μg cm⁻², which surpassed most of the non-precious metal electrocatalysts reported.

Co/Co9S8 nanoparticles coupled with N,S-doped graphene-based mixed-dimensional heterostructures as bifunctional electrocatalysts for the overall oxygen electrode

A Co/Co₉S₈/rGO/MWCNT composite catalyst was designed and fabricated via a combined hydrothermal reaction with a calcination method for the ORR/OER.

Fine Co nanoparticles encapsulated in N-doped porous carbon for efficient oxygen reduction

Through the acid pickling of Co@NPC, which was obtained by one-step calcination of ZIF-67 in N₂ and condition optimization of Co nanoparticle sizes, a catalyst of fine Co nanoparticles encapsulated in N-doped porous carbon with excellent ORR performance was prepared.

Ultrasound-Assisted Removal of Tetracycline by a Fe/N-C Hybrids/H2O2 Fenton-like System

In this work, the degradation of tetracycline (TC) in water by the integrated ultrasound (US)-Fenton process was investigated. For this, a new composite Fe/N-C-x (x is the molar ratio of iron salt Fe(NO₃)₃·9H₂O) catalyst was synthesized through simple carbonization of the mixture of glucose and iron salt Fe(NO₃)₃·9H₂O in the presence of ammonium chloride as the nitrogen source. The resultant catalysts were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, vibrating sample magnetometer, and N₂ adsorption-desorption, showing a typical graphite porous structure and good magnetic properties. The results indicated that the optimized Fe/N-C-2 catalyst prepared with a mole ratio of glucose/Fe(NO₃)₃·9H₂O/NH₄Cl of 5:2:16.8 exhibited the highest TC removal in the Fe/N-C-2/H₂O₂/US system at a wide pH range from 3.0 to 11.0. At an initial pH of 7.0, TC removal in the Fe/N-C-2/H₂O₂/TC/US system was 1.83, 18.69, and 28.75 times of that in Fe/N-C-2/TC/H₂O₂, H₂O₂/TC/US, and TC/H₂O₂ systems, showing a positive synergistic action between US and Fe/N-C-2. The effects of catalyst dosage, H₂O₂ concentration, ultrasonic power, humic acid, and coexisting anions on TC removal were investigated. The preliminary analysis suggested that the Fe-N species and the graphite N dispersed in the carbon matrix are responsible for the efficient catalytic activity. By a simple magnetic separation, the Fe/N-C-2 catalyst was easily recovered and used for the next degradation experiment. Above 88% catalytic ability of Fe/N-C-2 was retained even after six successive runs, suggesting its good reusability. The simple preparation strategy, good magnetic property, and good catalytic ability of the Fe/N-C-2 materials make them promising alternative Fenton-like catalysts for the antibiotics abatement in water.