Nitrogen‑Doped Porous Carbon Networks Derived from Graphitic Carbon Nitride for High‑Performance Oxygen Reduction
Oxygen reduction reaction (ORR) underpins the operation of fuel cells and metal‑air batteries. While platinum‑based catalysts deliver high activity, their cost, limited durability, and methanol sensitivity impede commercialization. Here we report a simple, scalable synthesis of nitrogen‑doped porous carbon networks (NC‑T) that combine high surface area, rich nitrogen content, and excellent ORR performance without noble metals. Graphitic carbon nitride (g‑C₃N₄) serves simultaneously as a structural template and nitrogen source, while dopamine (DA) provides the carbon skeleton. After hydrothermal coating at 120–160 °C and a single‑step pyrolysis at 900 °C, the resulting NC‑120 material exhibits a specific surface area of 954 m² g⁻¹ and 5.71 % nitrogen. Electrochemical tests in 0.1 M KOH reveal an onset potential of 0.224 V vs. RHE, a limiting current density comparable to commercial Pt/C, and superior methanol tolerance and cycling stability. This work demonstrates a metal‑free, cost‑effective route to high‑activity ORR catalysts that can be directly integrated into next‑generation fuel cells.
Abstract
Nanomaterials
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