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(A) Surface charge density and (B) structural stability of various metal-absorbed graphenes at positive and negative biases. These panels were reproduced with permission from ref (67). Copyright 2021 Elsevier, Ltd. Supercapacitive performance of the Ni nanoparticle-decorated CNT network (C) at a different potential window and (D) in different aqueous electrolytes. These panels were reproduced with permission from ref (71). Copyright 2017 Elsevier B.V.
