Photocatalytic performance enhancement of CuO/Cu2O heterostructures for photodegradation of organic dyes: Effects of CuO morphology

Anchoring CuO Nanoparticles On C, N‐Codoped G‐C3N4 Nanosheets from Melamine‐Entrapped MOF Gel for High‐Efficiency Oxygen Evolution

“…The Cu 2p spectrum (Figure c) display a pair of peaks (Cu 2p 3/2 /2p 1/2 ) at 933.7 and 953.5 eV, and their difference of nearly 20 eV between the spin‐orbit energies, prove the product of the CuO crystals . The satellite peak at 962.5 eV (Cu 2p 1/2 ) and the overlapping one at 940.0 eV (Cu 2p 3/2 ) demonstrate the bivalence oxidation state of Cu . The deconvoluted O1s spectra (Figure d) at 531.6 eV and 530.0 eV shows the O atoms in the C=O and CuO, respectively, the one at 531.2 eV is assigned to the hydroxyl group (∫OH) at surface defects, which should enhance the catalytic OER activity of the catalyst.…”

“…The peak at 400.7 eV indicates the presence of graphitic N . The Cu 2p spectrum (Figure c) display a pair of peaks (Cu 2p 3/2 /2p 1/2 ) at 933.7 and 953.5 eV, and their difference of nearly 20 eV between the spin‐orbit energies, prove the product of the CuO crystals . The satellite peak at 962.5 eV (Cu 2p 1/2 ) and the overlapping one at 940.0 eV (Cu 2p 3/2 ) demonstrate the bivalence oxidation state of Cu .…”

“…The satellite peak at 962.5 eV (Cu 2p 1/2 ) and the overlapping one at 940.0 eV (Cu 2p 3/2 ) demonstrate the bivalence oxidation state of Cu . The deconvoluted O1s spectra (Figure d) at 531.6 eV and 530.0 eV shows the O atoms in the C=O and CuO, respectively, the one at 531.2 eV is assigned to the hydroxyl group (∫OH) at surface defects, which should enhance the catalytic OER activity of the catalyst. These prove that CuO/CN−C 3 N 4 is a hierarchical structure, where CuO NPs are embedded on sp 2 ‐hybridized C, N codoped g ‐C 3 N 4 nanosheets.…”

Photodegradation of Stearic Acid Adsorbed on Copper Oxide Heterojunction Thin Films Prepared by Magnetron Sputtering

“…Such pn-junctions are effective for electron-hole pair charge separation and show an enhanced photoconductivity [15]. Li et al [16] and Jiang et al [17] have reported an enhanced photodegradation of dyes in aqueous solutions and attributed their observations to charge separation at the Cu 2 O/CuO interfaces as being due to their different valance and conduction band positions (with the Cu 2 O edges located at lower energy with respect to vacuum compared to CuO). Our results clearly show that the mixed metallic Cu-Cu 2 O is the most active film; much more effective compared with mixed Cu 2 O-Cu 3 O 4 /CuO films.…”

“…While the photocatalytic activity of single phase Cu 2 O (cuprous oxide) and CuO (cupric oxide) have been studied by several groups [9][10][11][12][13][14], and been interpreted in terms of nano-morphology, exposed facets and low-coordinated Cu surface atoms, very few studies on mixed CuO-Cu 2 O or Cu-Cu 2 O/Cu 2 O have been reported [15]. Previously, copper oxide heterojunctions have been prepared for photovoltaic [15] and organic dye degradation in aqueous solutions [16,17]. To the best of our knowledge no reports on the photocatalytic of copper oxide heterojunction thin films have been reported.…”