Investigation of p-CuNb2O6 for use as photocathodes for photoelectrochemical water splitting

Enhanced Photoelectrocatalytic Activity of CuO/CuNb2O6 Heterojunction Photocathodes for Efficient Solar Water Splitting

“…The direct bandgaps of CuO, CNO, and the CuO/CNO heterojunction were 1.53, 1.41, and 1.24 eV, respectively, as depicted in Figure 4b. These values aligned with the findings reported in the literature [36] . The indirect bandgaps of CuO, CNO, and the CuO/CNO heterojunction were 1.98, 1.94, and 1.85 eV, respectively, as indicated in Figure S4.…”

“…The X‐ray diffraction patterns of the films are consistent with those of CuO and CNO. CNO is consistent with PDF # 83‐0369, and the first peak is located at 29.9°, corresponding to the ($${\bar{1}}$$ 31) plane, which is consistent with our previous preparation [36] . The XRD pattern of the CuO film corresponds to PDF # 45‐0937 and displayed a pronounced (002) orientation, aligning with the results reported by Feng et al [37] .…”

“…CNO is consistent with PDF # 83-0369, and the first peak is located at 29.9°, corresponding to the (131) plane, which is consistent with our previous preparation. [36] The XRD pattern of the CuO film corresponds to PDF # 45-0937 and displayed a pronounced (002) orientation, aligning with the results reported by Feng et al [37] for a similarly prepared film. The XRD analysis of the CuO/CNO heterojunction revealed the crystal phase composition, confirming a mixture of CuO and CNO without any detectable peaks of impurities such as Nb 2 O 5 .…”

“…Corrosion occurred in both stability tests, probably because the electrons after irradiation were excited to the copper system, which caused a large area of corrosion in the reduction of copper. [36,70] As shown in Figure S10, the stability of CuO and CNO photocathodes under 0.4 V vs. RHE backlight was compared. It can be seen from the figure that the photocurrent of CuO and CNO tends to dark current after 70 min and 95 min, respectively.…”

Metal-doped niobate pyrochlores and double-perovskites for glycerol valorization: structural and electronic properties and DFT calculations

“…The peaks are accompanied by two satellites at 936.3 and 940.6 eV, matching well with those of Cu 2+ ions in both CuNb 2 O 6 and Cu 3 Nb 2 O 8 materials. 29,49–52 This result agrees with the XRD and Raman measurements that suggest the existence of the aforesaid phases. As with most of the observed surface properties of Cu-based materials, 51,52 the Cu LMM Auger line also appears as a broad peak in the 578–574 eV range, which is readily attributable to the divalent and monovalent copper species.…”