Figure 6.

HER volcano curve of the exchange current density (i0) as a function of MM′-NPG (in-plane dual-metal atom in nitrogen-doped porous graphene). Reproduced with permission from ref (176). Copyright 2021 Elsevier.

HER volcano curve of the exchange current density (i0) as a function of MM′-NPG (in-plane dual-metal atom in nitrogen-doped porous graphene). Reproduced with permission from ref (176). Copyright 2021 Elsevier.