Ultrapure Graphene Is a Poor Electrocatalyst: Definitive Proof of the Key Role of Metallic Impurities in Graphene-Based Electrocatalysis Vlastimil Mazánek, Jan Luxa, Stanislava Matejkova, Jan Kucera, David Sedmidubský, Martin Pumera, Zdeněk Sofer* ACS Nano 2019, 13(2), 1574-1582
