Cobalt Single-Atom Catalysts with High Stability for Selective Dehydrogenation of Formic Acid

Abstract

Metal-organic framework (MOF)-derived Co-N-C catalysts with isolated single cobalt atoms have been synthesized and compared with cobalt nanoparticles for formic acid dehydrogenation. The atomically dispersed Co-N-C catalyst achieves superior activity, better acid resistance, and improved long-term stability compared with nanoparticles synthesized by a similar route. High-angle annular dark-field-scanning transmission electron microscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance, and X-ray absorption fine structure characterizations reveal the formation of Co^II N_x centers as active sites. The optimal low-cost catalyst is a promising candidate for liquid H₂ generation.

Keywords: cobalt; dehydrogenation; energy; nanoparticles; single-atom catalysts.