Carbon nanotube/S–N–C nanohybrids as high performance bifunctional electrocatalysts for both oxygen reduction and evolution reactions

摘要: Exploring high performance bifunctional electrocatalysts for efficient oxygen reduction and evolution reactions is of crucial importance sustainable energy conversion storage devices including rechargeable metal–air batteries fuel cells. In this work, one-dimensional (1D) cable-like multiwall carbon nanotube/S, N co-doped nanodot (MWCNT@S–N–C) hybrids were synthesized by annealing nanotubes/polythiophene (MWCNT@Pth) in the NH3 atmosphere. The as-prepared catalysts exhibit an outstanding reaction (ORR) activity (an unusual limiting current density 7.62 mA cm−2), strong immunity towards methanol crossover long-term stability. Moreover, obtained also display a higher toward (OER) compared to state-of-the-art IrO2 catalyst, demonstrating excellent overall bi-catalytic performance. This superior electrocatalytic arises from synergistic chemical coupling effects between S N, reactant transport provided mesoporous structures charge transfer rate driven 1D MWCNTs, thereby generating bi-functional electrocatalyst both ORR OER. first time that S, materials have been investigated as effective catalysts, which not only provides further insight into mechanism, but new approach design fabrication metal-free with low cost efficiencies electrochemical conversion.