Intracell Hydrogen Adsorption–Transmission in a Co2P Solid Hydrogen-Storage Material

Co₂P nanoparticles, obtained by a simple mechanical ball-milling treatment, have been shown to undergo a new hydrogen adsorption–transmission process called intracell Kubas-enhanced adsorption, which results in an improved hydrogen-storage capacity. It is found that in this intracell Kubas-enhanced adsorption process hydrogen is firstly adsorbed by the Co atoms in Co₂P through a Co···H interaction and activated. It is then spilt over to the P atoms in Co₂P accompanied by the formation of a P–H bond, which has a lower bonding energy. This adsorption–transmission process is unambiguously proved by a detailed analysis of X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), cyclic voltammetry (CV), and quantum chemical calculation results.

An intracell Kubas-enhanced adsorption mechanism for improving the hydrogen-storage capacity of Co₂P has been described for the first time.

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