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Binder-free, graphitic, hierarchically porous carbon nanofiber (CNF) electrodes with in-situ encapsulated Co–Ni catalysts are synthesized with electrospinning as an efficient oxygen electrode for Li–O2 batteries (LOBs). The inherently interconnected, graphitic network makes it unnecessary to include binders and carbon additives, therefore eliminating the possible side reactions from binder and facilitating...