Synergistic coupling of heterogeneous VN/WN nanoparticles embedded in N-doped carbon matrix for efficient hydrogen evolution reaction

Synthesis of vanadium nitride from vanadium spinel by synchronous reduction and nitridation with ammonia energy

“…The V 2p (Figure 5B) spectra can be deconvoluted into three main peaks: 513.8, 515.0, and 517.2 eV, corresponding to the V‐N, V‐N‐O, and V‐O bonds, respectively 30,31 . The binding energies of these bonds for at 700°C 1 and 2 h were almost identical.…”

“…The V 2p (Figure 5B) spectra can be deconvoluted into three main peaks: 513.8, 515.0, and 517.2 eV, corresponding to the V-N, V-N-O, and V-O bonds, respectively. 30,31 The binding energies of these bonds for at 700 C 1 and 2 h were almost identical. However, all of these peaks shifted to the lower binding energy by about 0.3 eV due to the increased N content in the sample.…”

Vanadium Nitride/Carbon Nanotube Vertical Nanoarrays on Iron Foam for Oxygen Evolution Reaction

“…The V 2p XPS of VN/CNT/IF shows four main fitting peaks. The peaks at 513.3 and 521.0 eV belong to the V–N bond of VN, and the peaks at 515.8 and 523.5 eV are assigned to VNO and V–O on the sample surface, respectively. , At the same time, due to the inevitable surface oxidation process in the preparation of the catalyst, the high-resolution Fe 2p spectra of VOOH/IF (Figure b) shows that the surface oxide was formed on the surface of IF. The peak values of the binding energy at 725.3 and 711.7 eV were detected, corresponding to Fe 2p 1/2 and Fe 2p 2/3 , respectively .…”

“…Figure a shows the high-resolution XPS of the O 1s–V 2p region; the peaks at 531 eV are ascribed to O 1s, and the range from 510 to 527 eV is ascribed to V 2p. The high-resolution V 2p spectra of VOOH/IF can be decomposed into the V 2p 3/2 and V 2p 1/2 core-level spectra, in which the peaks at 517.8 and 525.0 eV are identified as vanadium oxy/hydroxide. , …”

Heterogeneous Ni3P/Ni nanoparticles with optimized Ni active sites anchored in N-doped mesoporous nanofibers for boosting pH-universal hydrogen evolution

“…4b was fitted to four chemically bound N species, corresponding to pyridinic N (398.46 eV), pyrrolic N (399.54 eV), graphitic N (400.79 eV), and oxidized N (402.27 eV). 48,49 Owing to the higher electronegativity of the heteroatom N than that of the C atom, the N species including graphitic N, pyridinic N and pyrrolic N can affect the charge delocalization of C, improving the electrical conductivity of the material and facilitating the electron transfer during the HER. 50 Furthermore, the pyridinic N with lonepair electrons could facilitate electron transfer and the pyrrolic N with electron-rich groups would provide electrons for the HER, thus enhancing the HER activity.…”