ASSOCIATED CONTENT Supporting Information. Experimental section, ccrystal data and structure refinement parameters, geometric analysis of the NC, XPS spectrum, charge distribution, UV-vis spectrum, XANES spectrum, raw data for electrocatalytic CO2RR and comparison with inert atmosphere, chronoamperometric measurements, TEM images, FT-EXAFS spectra and FT-IR. Materials and methods, "This material is available free of charge via the Internet at ."