Abstract
High-efficient and low-cost oxygen evolution reaction (OER) electrocatalysts are of considerable significance for large-scale electrocatalytic water splitting to produce hydrogen. In this work, we have introduced O2 plasma to engineer Fe-doped Ni2P (Fe-Ni2P) nanosheets, which is grown on the conductive NiFe foam. Interestingly, this facile and rapid plasma treatment can simultaneously achieve defect engineering (P vacancies) and the formation of new species (phosphate). The P vacancies could modulate the electronic structure of the electrocatalyst for the OER process, while the formed phosphate species could facilitate water adsorption and improve the charge transfer. Consequently, the O2-plasma treated Fe-Ni2P nanosheets with rough surface and nanoholes exhibit low overpotentials of 207 and 218 mV at 50 and 100 mA cm−2, small Tafel slope of 45 mV dec−1 and excellent durability in alkaline electrolyte. Our work reveals the delicate structural transformation of the plasma-engineered material, and provides insights of the structure-property relationship of high-performance OER electrocatalyst.
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