“…Figure b shows P 2p XPS spectra of NF@CoFeP. The peaks located at 129.3 and 130.1 eV are attributed to metal–P bonds including Fe–P, Co–P, and Ni–P while 134.0 eV originates from P–O bondd in phosphate groups. − The Co 2p XPS spectrum shows six fitting peaks at 782.6, 780.6, 786.0, 795.8, 798.0, and 803.7 eV, respectively ascribed to Co 2+ 2p 3/2 , Co 3+ 2p 3/2 , Co 2p 3/2 satellite, Co 2+ 2p 1/2 , Co 3+ 2p 1/2 , and Co 2p 1/2 satellite (Figure c). − Similarly, Fe 2+ and Fe 3+ are also demonstrated in NF@CoFeP (Figure d). , The Ni 2p XPS spectrum reveals that Ni 0 , Ni 2+ , and Ni 3+ coexist in NF@CoFeP (Figure S7). − The Ni 0 signal should be from the NF substrate, while Ni 2+ and Ni 3+ are due to the presence of Ni 5 P 4 species on NF.…”