Ag-doped ZnO nanorods embedded reduced graphene oxide nanocomposite for photo-electrochemical applications

In this paper, the Ag-doped zinc oxide nanorods embedded reduced graphene oxide (ZnO:Ag/rGO) nanocomposite was synthesized for photocatalytic degradation of methyl orange (MO) in the water. The microstructural results confirmed the successful decoration of Ag-doped ZnO nanorods on rGO matrix. The photocatalytic properties, including photocatalytic degradation, charge transfer kinetics and photocurrent generation, are systematically investigated using electrochemical impedance spectroscopy (EIS), photocurrent transient response (PCTR) and open circuit voltage decay (OCVD). The results of photocatalytic dye degradation measurements indicated that ZnO:Ag/rGO nanocomposite is more effective than pristine ZnO to degrade the MO dye, and the degradation rate reached 40.6% in 30 min. The decomposition of MO with ZnO:Ag/rGO nanostructure followed first-order reaction kinetics with a reaction rate constant ( K a ) of 0.01746 min −1 . The EIS, PCTR and OCVD measurements revealed that the Ag doping and incorporation of rGO could suppress the recombination probability in ZnO by the separation of photo-generated electron–hole pairs, which leads to the enhanced photocurrent generation and photocatalytic activity. The photocurrent density of ZnO:Ag/rGO, ZnO/rGO and pristine ZnO are 206, 121.4 and 88.8 nA cm −2 , respectively.

Download Full-text

Efficient Photocatalytic Degradation of Malachite Green in Seawater by the Hybrid of Zinc-Oxide Nanorods Grown on Three-Dimensional (3D) Reduced Graphene Oxide(RGO)/Ni Foam

Materials ◽

10.3390/ma11061004 ◽

2018 ◽

Vol 11 (6) ◽

pp. 1004 ◽

Cited By ~ 6

Author(s):

Qing Wang ◽

Chaoyue Cai ◽

Mingyan Wang ◽

Qian Guo ◽

Biao Wang ◽

...

Keyword(s):

Zinc Oxide ◽

Graphene Oxide ◽

Photocatalytic Degradation ◽

Reduced Graphene Oxide ◽

Malachite Green ◽

Three Dimensional ◽

Zinc Oxide Nanorods ◽

Ni Foam ◽

Oxide Nanorods ◽

Reduced Graphene

Download Full-text

Silver-doped ZnO embedded reduced graphene oxide hybrid nanostructured composites for superior photocatalytic hydrogen generation, dye degradation, nitrite sensing and antioxidant activities

Inorganic Chemistry Communications ◽

10.1016/j.inoche.2021.109051 ◽

2021 ◽

pp. 109051

Author(s):

P.C. Nethravathi ◽

D. Suresh

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Hydrogen Generation ◽

Antioxidant Activities ◽

Dye Degradation ◽

Nanostructured Composites ◽

Photocatalytic Hydrogen Generation ◽

Reduced Graphene ◽

Doped Zno

Download Full-text

A Facile and Green Synthesis of a MoO2-Reduced Graphene Oxide Aerogel for Energy Storage Devices

Materials ◽

10.3390/ma13030594 ◽

2020 ◽

Vol 13 (3) ◽

pp. 594 ◽

Cited By ~ 3

Author(s):

Mara Serrapede ◽

Marco Fontana ◽

Arnaud Gigot ◽

Marco Armandi ◽

Glenda Biasotto ◽

...

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Photoelectron Spectroscopy ◽

Electrochemical Impedance ◽

Chemical Reduction ◽

Low Cost ◽

Xps Analysis ◽

3D Scaffold ◽

Energy Storage Devices ◽

Reduced Graphene

A simple, low cost, and “green” method of hydrothermal synthesis, based on the addition of l-ascorbic acid (l-AA) as a reducing agent, is presented in order to obtain reduced graphene oxide (rGO) and hybrid rGO-MoO2 aerogels for the fabrication of supercapacitors. The resulting high degree of chemical reduction of graphene oxide (GO), confirmed by X-Ray Photoelectron Spectroscopy (XPS) analysis, is shown to produce a better electrical double layer (EDL) capacitance, as shown by cyclic voltammetric (CV) measurements. Moreover, a good reduction yield of the carbonaceous 3D-scaffold seems to be achievable even when the precursor of molybdenum oxide is added to the pristine slurry in order to get the hybrid rGO-MoO2 compound. The pseudocapacitance contribution from the resulting embedded MoO2 microstructures, was then studied by means of CV and electrochemical impedance spectroscopy (EIS). The oxidation state of the molybdenum in the MoO2 particles embedded in the rGO aerogel was deeply studied by means of XPS analysis and valuable information on the electrochemical behavior, according to the involved redox reactions, was obtained. Finally, the increased stability of the aerogels prepared with l-AA, after charge-discharge cycling, was demonstrated and confirmed by means of Field Emission Scanning Electron Microscopy (FESEM) characterization.

Download Full-text

Magnetically separable reduced graphene oxide/iron oxide nanocomposite materials for environmental remediation

Catalysis Science & Technology ◽

10.1039/c4cy00806e ◽

2014 ◽

Vol 4 (12) ◽

pp. 4396-4405 ◽

Cited By ~ 85

Author(s):

Teo Peik-See ◽

Alagarsamy Pandikumar ◽

Lim Hong Ngee ◽

Huang Nay Ming ◽

Chia Chin Hua

Keyword(s):

Methylene Blue ◽

Graphene Oxide ◽

Iron Oxide ◽

Photocatalytic Degradation ◽

Reduced Graphene Oxide ◽

Environmental Remediation ◽

Nanocomposite Materials ◽

Reduced Graphene ◽

Magnetically Separable

Synthesis of magnetically separable rGO/Fe3O4nanocomposite materials for environmental remediationviathe photocatalytic degradation of methylene blue.

Download Full-text