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Low‐cost heteroatom‐doped carbon nanomaterials have been widely studied for efficient oxygen reduction reaction and energy storage and conversion in metal‐air batteries. A Masson pine twigs‐like 3‐dimensional network construction of carbon nanofibers (CNFs) with abundant straight long Co, N, and S‐doped carbon nanotubes (CNTs) is developed by thermal treatment of Co‐based polymer coated onto polyacrylonitrile...
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