In situ synthesis of NiP nanostructures on Ni foam for high-performance supercapacitors

In this paper, the NiP nanostructures were grown on the surface of Ni foam (NF) via a phosphorization reaction of Ni(OH) nanostructures that were synthesized by a facile, low-cost hydrothermal reaction of NF in 15 mM urea solution without nickel salt. Others, the obtained NF loaded by NiP nanostructures (NiP-NF) can be used as a binder-free electrode. Electrochemical testing was used to research the electrochemical performances of the NiP-NF as supercapacitors electrode. Results showed that the NiP-NF electrode displays remarkable specific capacitance of 2031 mF cm (2539 F g) at the current density of 1 mA cm (2859 mF cm (3574 F g) at the potential scan rate of 5 mV s), good rate capability, and prominent cycle stability (the capacitance retention is 89.3% after 2500 cycles). Therefore, the self-supported NiP-NF is an excellent electrode for high-performance supercapacitors.