Photocatalytic reduction of graphene oxide with cuprous oxide film under UV-vis irradiation

Abstract

<jats:title>Abstract</jats:title><jats:p>We have grown Cu<jats:sub>2</jats:sub>O films by different routes including self-oxidation and metal-organic deposition (MOD). The reduction efficiency of Cu<jats:sub>2</jats:sub>O films on graphene oxide (GO) synthesized by modified Hummer’s method has been studied. Surface morphology and chemical state of as-prepared Cu<jats:sub>2</jats:sub>O film and GO sheets reduced at different conditions have also been investigated using atomic force microscopy (AFM) and x-ray photoelectron spectroscopy (XPS). Results show that self-oxidation Cu<jats:sub>2</jats:sub>O film is more effective on phtocatalytic reduction of GO than MOD-Cu<jats:sub>2</jats:sub>O film. Moreover, reduction effect of self-oxidation Cu<jats:sub>2</jats:sub>O film to GO is comparable to that of environmental-friendly reducing agent of vitamin C. The present results offer a potentially eco-friendly and low-cost approach for the manufacture of reduced graphene oxide (RGO) by photocatalytic reduction.</jats:p>

Acoustotemplating: rapid synthesis of freestanding quasi-2D MOF/graphene oxide heterostructures for supercapacitor applications

“…73 We attribute the effective loss of this peak in the q-2D-MOF/rGO sample to the coordinated Cu 2+ ions, which act as electron acceptors in the photocatalytic reduction of GO under UV. 95,96 The significance of the Cu coordination in the reduction process is further evidenced by the C/O ratio, which increases by almost 70% from 1.96 (HKUST-1/rGO) to 2.92 (q-2D-MOF/rGO), as reported in Table S2 †. While harsh reduction techniques such as laser-scribing have been reported for the successful removal of the CO groups, the MOF crystal structure is often sacrificed during the process.…”

Electrochemical tuning of a Cu3P/Ni2P hybrid for a promoted hydrogen evolution reaction

“…The peaks with lower binding energies at 931.46 eV and 951.33 eV corresponded to 2p3/2 and 2p1/2 of Cu 0 , respectively, peaks at 933.85 eV and 953.85 eV were attributed to Cu 2p in Cu 3 P, respectively, and satellite peaks were observed at the binding energies of 941.30 eV, 943.12 eV, and 961.71 eV. 16,41,42 The high-resolution XPS spectrum of P 2p in Fig. 2d showed a weak peak at 129.00 eV 43,44 and a strong peak at 132.23 eV which were associated with P 2p3/2 in the metal-P bond and oxidized P, respectively.…”

Theoretical calculation of a TiO2-based photocatalyst in the field of water splitting: A review

“…As shown in Figure 1, based on the solid energy band theory, the energy band structure of semiconductor TiO 2 is very different from that of metals or insulators, as it contains a valence band (VB), a conduction band (CB), and a region between the CB and the VB called the band gap. The formula used to calculate the band gap (E g ) is E g = E VB − E CB , where E CB corresponds to the bottom potential of the CB, and E VB corresponds to the top potential of the VB [79,80]. When the energy of the incident photon is equal to or greater than the E g of TiO 2 , the electrons in the VB will shift to the CB, and the holes will be generated in the VB, thus forming a photogenerated electron (e − )-hole (h + ) pair [81,82].…”