Abstract
The development of bifunctional electrochemically-active materials for both hydrogen evolution reaction (HER) and supercapacitors enables the possibility to integrate energy storage and production into one single system. Here, we report a novel bifunctional mesoporous Ni2P nanobelt-like architecture prepared via the hydrothermal synthesis of Ni(SO4)0.3(OH)1.4 nanobelt precursor and subsequent low temperature phosphorization process under Ar atmosphere. Composed of numerous cross-linked Ni2P nanoparticles, the as-obtained Ni2P nanobelts exhibit a two dimensional leaf-like morphology, allowing remarkable enhancement of mesoporosity as well as active surface area. The HER electrocatalytic test in acid medium show a current density of 16 mA cm−2 at an overpotential of 187 mV, Tafel slope of 62 mV dec−1 and long-term durability. Investigation of this Ni2P nanobelts as supercapacitor materials in 2M KOH electrolyte display a high specific capacity ranging from 1074 F g−1 at 0.625 A g−1 to 554 F g−1 at 25 A g−1, and notable cycling life with 86.7% retention after 3000 cycles at 10 A g−1. With the simplicity of the synthetic routine and the outstanding performance as both HER catalysts and supercapacitors, the Ni2P nanobelts provide promising potential for energy devices.
Published Version
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