Spontaneously separated intermetallic Co3Mo from nanoporous copper as versatile electrocatalysts for highly efficient water splitting

摘要

Typical cross-sectional SEM image of Co Mo/Cu electrode prepared by chemically dealloying Cu Co Mo Al alloy precursor, displaying a three-dimensional bicontinuous and bimodal nanoporous architecture. Scale bar, 200 nm. High-resolution cross-sectional SEM image of Co Mo/Cu electrodes with a number of intermetallic Co Mo nanoparticles in-situ integrated on Cu ligaments. Scale bar, 100 nm. STEM image and the corresponding STEM-EDS elemental mappings of Cu, Co and Mo, demonstrating the Co Mo nanoparticles grown on Cu ligaments. Scale bar, 10 nm. Atomic resolution HAADF-STEM image of intermetallic Co Mo nanoparticles grown on Cu ligament with a coherent interface structure. Inset: atomic structure of intermetallic Co Mo. Scale bar, 1 nm. , FFT patterns of Co Mo ( ) and Cu ( ) in the selected areas in ( ). XRD patterns of nanoporous Co Mo/Cu hybrid electrode and bare nanoporous Cu electrode. The line patterns show reference cards 04-0836 and 29-0488 for Cu and Co Mo phases according to JCPDS, respectively.