Ultrasmall Co-NiP embedded into lantern shaped composite achieved by coordination confinement phosphorization for overall water splitting
Social Science Research Network(2022)
摘要
Currently, the challenges remain for developing promising water splitting electrocatalyst, and the non-noble metal-based catalytic materials are ideal alternatives. This study reported a hierarchical lantern Ni-doped Co-MOF synthesized by simple stirring at room temperature, which further generated an efficient bifunctional Ni-doped CoP@carbon-nitrogen (Co-NiP@NC) water splitting electrocatalyst using a coordination confinement phosphating approach, and the Co-NiP nanoparticles (ca. 5 nm) were successfully embedded into the NC nanosheets. This catalyst shows excellent catalytic efficiency with 140 mV overpotential for hydrogen evolution reaction (HER) at the current density of 10 mA·cm−2 in 1.0 M KOH. Meanwhile, it can be used as an ideal catalyst for catalyzing oxygen evolution reaction (OER) with the overpotential of 280 mV under the same conditions. Thus, only a voltage of 1.67 V was required to realize the overall water splitting at the current of 10 mA·cm−2 when the Co-NiP@NC catalyst could act as both electrodes. Additionally, the catalyst displays the excellent HER, OER, and over water splitting (OWS) stabilities after 24 h, and the potentials decrease are feeble 2.7%, 2.9%, and 1.7%. Overall, the coordination confinement pyrolysis generated catalyst integrates the advantages of super small nanoparticles and rich hierarchical structure, providing new storage to design efficient electrocatalysts.
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关键词
Metal-organic frameworks derivatives,Electrocatalysis,Overall water splitting,Hydrogen evolution reaction,Oxygen evolution reaction
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