Stable Cu/Cu 2 O/CuN 3 @NC Catalysts for Aqueous Phase Reforming of Methanol.

Aqueous-phase reforming of methanol represents a promising avenue for hydrogen (H 2 ) production. However, developing highly efficient and low-cost nonprecious catalysts remains challenging. Here, we report the synthesis of Cu-based catalysts with Cu, Cu 2 O, and CuN 3 nanoparticles anchored on the nitrogen-doped carbon, forming Cu 0 /Cu + /Cu-N 3 active sites. This catalyst achieves a H 2 production rate of 140.1 μmol/g cat /s at 210 °C, which is several times to 2 orders of magnitude higher than that of Cu-, Ni-, even Pt-based catalysts, demonstrating excellent long-term stability over 350 h at 210 °C. A mechanism investigation reveals that the Cu-N 3 site facilitates water dissociation into *OH and improves *CO and *OH conversion, leading to enhanced CO conversion and H 2 production kinetics.