Metallic cobalt encapsulated in N-doped carbon nanowires: a highly active bifunctional catalyst for oxygen reduction and evolution

摘要

N-doped carbon nanowires encapsulated with cobalt nanoparticles are designed and fabricated through solvothermal and pyrolysis procedures by using cobalt chloride and nitrilotriacetic acid as the precursors. The catalyst (C-NTACo-500) demonstrated great potential as highly active bifunctional catalyst for oxygen reduction and oxygen evolution reactions (ORR and OER), with a half wave potential (E-1/2) of 0.84 V (vs. RHE) for ORR, and a small overpotential of 0.28 V for OER. Notably, it could provide zinc air batteries (ZAB) a maximum power density of 203.4 mW cm(-2), and a high specific capacity of 822.4 mAh g(Zn)(-1), as well as excellent charge-discharge stability.

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