Fig. 6
From: Noble metal-free two dimensional carbon-based electrocatalysts for water splitting
a Representation of the synthetic procedure of the porous carbon and corresponding. b LSV curves. a, b Reproduced with permission from Ref. [105]. Copyright 2015, Royal Society of Chemistry. c Structural models and charge density of H adsorbed on the surface of carbon. d Corresponding Tafel plots of N, S-doped porous carbons. c, d Reproduced with permission from Ref. [106]. Copyright 2016, Elsevier. e Schematic of the synthetic route of Ni–N–C. Reproduced with permission from Ref. [108]. Copyright 2018, Wiley-VCH