Fabrication of graphene oxide wrapped Ti/Co₃O₄ nanowire photoanode and its superior photoelectrocatalytic performance

Abstract

Here, we successfully fabricated graphene oxide (GO) wrapped Ti/Co 3 O 4 nanowires (NWs) by electrophoretic deposition based on the good dispersibility of GO in an aqueous solution. Interestingly, GO can adhere to the surface of Co 3 O 4 NWs via an ultrathin gossamer-like sheet, and the coverage and wrapping of GO on the surface of Co 3 O 4 NWs can be controlled by tuning the electrochemical deposition time and voltage. Our results also demonstrate that GO wrapped Co 3 O 4 NWs had superior photoelectrochemical activity for the decolorization of dye (reactive brilliant blue KN-R) in wastewater, mainly because the introduction of GO can tune the oxygen evolution behavior, the transportation of reactant and induced carriers, electrochemical active areas, and the light-harvesting capability of Co 3 O 4 NWs. Therefore, we anticipate that GO wrapped Ti/Co 3 O 4 NWs could be considered as a promising photoanode for the treatment of organic pollutants in wastewater.

Hydrothermal Microwave Synthesis of Co3O4/In2O3 Nanostructures for Photoelectrocatalytic Reduction of Cr(VI)

“…The chemical composition and elemental valence states of the catalysts were investigated through X-ray photoelectron spectroscopy (XPS) measurements . The XPS full survey spectrum of CI-5%–400 is shown in Figure A, which shows the presence of Co, In, and O elements . The O 1s spectra (Figure B) exhibit three peaks at 529.78, 531.1, and 533.7 eV, which can be attributed to the lattice oxygen (O 2– ), oxygen vacancy (OH – ), and molecular water (H 2 O) species, respectively. , For Co 2p spectra (Figure C), two peaks at 780.2 and 795.3 eV belong to Co 2p 3/2 and Co 2p 1/2 , respectively .…”

“…38 The O 1s spectra (Figure 4B) exhibit three peaks at 529.78, 531.1, and 533.7 eV, which can be attributed to the lattice oxygen (O 2− ), oxygen vacancy (OH − ), and molecular water (H 2 O) species, respectively. 38,39 For Co 2p spectra (Figure 4C), two peaks at 780.2 and 795.3 eV belong to Co 2p 3/2 and Co 2p 1/2 , respectively. 40 Furthermore, the difference in binding energy between the Co 2p 3/2 and Co 2p 1/2 orbitals (15.1 eV) suggests the co-existence of cobalt(II) and cobalt(III) species.…”

Effects of Graphene Oxide on Endophytic Bacteria Population Characteristics in Plants from Soils Contaminated by Polycyclic Aromatic Hydrocarbons

“…Due to its unique physicochemical properties and structure, GO has significant applications in the fields of medicine, environmental science, and material research [20]. For instance, GO can be used to synthesize a novel adsorbent (MS@RGO) that has demonstrated remarkable performance in removing marine pollution [21]; GO can also effectively treat organic pollutants in wastewater [22]. Moreover, the oxygen atoms on GO can form complexes with metal ions, which endows GO with the ability to adsorb different kinds of heavy metal ions and play a vital role in the removal of heavy metals [23].…”

A novel carbon‐fiber geopolymer composite‐coated electrodes for photoelectrocatalysis: Fabrication and application

“…Zhang et al 21 assembled graphene into geopolymers to enhance the electroconductivity and photocatalytic activity. Compared to conventional PEC photoanode materials (such as TiO 2 , 22 Co 3 O 4 , 23 ZnO, 24 BiVO 4 , 25 and g-C 3 N 4 26 ), geopolymers are cost-effective and environment-friendly because they can be synthesized using a simple, lowenergy, and low-carbon dioxide emission process. 27,28 Moreover, the electroconductivity of the photoanodes could be easily improved by introducing carbon materials, such as graphene or carbon fiber.…”