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a) Photographs of graphene hydrogels with tunable height. b) SEM image of the interior microstructures of freeze‐dried graphene hydrogel. Reproduced with permission.132 Copyright 2010, ACS. c,d) Photographs of a piece of Ni foam before and after coating of graphene gel. e,f) SEM images of Ni foam before and after coating of graphene gel. Reproduced with permission.134
