Encapsulated NiCo₂S₄‐based straight bamboo‐shaped N‐CNT as efficient and stable oxygen electrocatalysts

Abstract Developing highly effective and stable non‐precious bifunctional oxygen electrocatalysts is crucial challenging. Herein, we report nano‐mediated straight bamboo‐shaped nitrogen‐doped carbon nanotubes modified with encapsulated NiCo 2 S 4 ‐based nanoparticles (E‐NiCo /SBS‐NCNTs) by electrodeposition procedural calcination strategy, in which bamboo shape (SBS‐NCNTs) show more average diameter ) are coated carbon, what makes us even excited that they evenly dispersed on SBS‐NCNTs surface, not just at the tip or inside. When applied for evolution reaction (OER) reduction (ORR), E‐NiCo /SBS‐NCNTs excellent catalytic activity, onset potential (E OER ORR only 1.52 V 0.95 (vs. RHE) 0.1 M KOH, respectively. More importantly, hybrids exhibit good methanol tolerance, almost unchanged performance after adding 0.5 methanol, it has stability, current density dropped 22% 7 h of reaction. The interaction external layer can greatly enhance electrocatalytic activity toward a complete 4e – process ORR. mainly due to synergistic enhancement effect, provide conductivity, expose active sites promotes fast mass transfer; Carbon‐coated improve local work function SBS‐NCNT through electronic interaction, promoting O adsorption, ensure rapid electron transport, enable its activity. Because weakness Ostwald effect enhancement, stability be improved. All these advantages synergistically efficiency make become one most promising electrocatalysts.