Electrochemical nano-patterning of brass for stable and visible light-induced photoelectrochemical water splitting

Facile Synthesis of Nanostructured Binary Ni–Cu Phosphides as Advanced Battery Materials for Asymmetric Electrochemical Supercapacitors

“…The two peaks observed at 853.1 and 870.4 eV are characteristics of Ni in Ni 2 P, suggesting the existence of Ni δ+ (0 < δ < 2), in agreement with the XRD findings showing diffraction peak characteristics of Ni 2 P. For the Cu 2p XPS spectrum (Figure b), two main peaks can be distinguished at 952.3 and 932.2 eV, corresponding to Cu 2p 1/2 and Cu 2p 3/2 in copper phosphide, indicating the presence of Cu + . The high energy peaks at 954.3 and 934.2 eV as well as the satellite peak at 943.2 eV reveal Cu 2+ oxidation state, which could be formed because of the ambient conditions . The XPS spectrum of P 2p (Figure c) was deconvoluted into two peaks centered at 133.3 and 130.9 eV that can be ascribed to reduced phosphorus in the form of metal phosphides .…”

One-step synthesis of novel Cu2ZnNiO3 complex oxide nanowires with tuned band gap for photoelectrochemical water splitting

“…8(a). The photocurrent intensity reached À2.5 mA cm À2 at À0.8 V, which is higher than the reported values for Cu 2 O, ZnO and NiO oxides under similar conditions (Borkar et al, 2018;Eissa et al, 2019;Li et al, 2019). This is probably the result of the combination of copper, zinc and nickel oxides into one complex oxide and the tuned band gap, which contributed to the photoactivity by achieving better light absorption and charge carrier photogeneration.…”

“…The metal-O bonding of Cu, Zn and Ni with O can be determined from the O 1s XPS high-resolution spectrum indicated in Fig. 6(e), in which one peak is observed at 530.25 eV that corresponds to the oxygen framework (Eissa et al, 2019;Zhou et al, 2020;Wang et al, 2020;Zhan et al, 2020). Therefore, XPS confirmed the formation of metal oxide on the surface of the nanowires in accordance with the Raman and XRD results.…”

“…The highresolution XPS spectrum of Zn 2p depicted in Fig. 6(c) reveals two peaks of Zn 2+ at 1021 and 1045 eV, which are characteristic of Zn 2p 1/2 and Zn 2p 3/2 , respectively (Eissa et al, 2019;Awad, Ashour, Fouda & Allam, 2014;Zhou et al, 2020). The Ni 2p high-resolution spectrum shown in Fig.…”

“…The high-resolution XPS scan of Cu 2p is displayed in Fig. 6(b), in which the two intense peaks at 933.56 and 953.36 eV correspond to Cu 2p 3/2 and Cu 2p 1/2 and suggest the existence of Cu + (Borkar et al, 2018;Eissa et al, 2019;Awad, Ashour, Fouda & Allam, 2014). The two satellite peaks at 940.08 and 943.17 eV probably correspond to Cu 2p 1/2 , which suggests the existence of Cu 2+ (Borkar et al, 2018).…”