Enhancing Hematite Photoanode Activity for Water O... - BV FAPESP
Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Enhancing Hematite Photoanode Activity for Water Oxidation by Incorporation of Reduced Graphene Oxide

Full text
Author(s):
Carminati, Saulo do Amaral [1] ; Souza, Flavio L. [2] ; Nogueira, Ana F. [1]
Total Authors: 3
Affiliation:
[1] Univ Estadual Campinas, Inst Chem, LNES, Campinas, SP - Brazil
[2] Univ Fed ABC, CCNH, Santo Andre - Brazil
Total Affiliations: 2
Document type: Journal article
Source: ChemPhysChem; v. 17, n. 1, p. 170-177, JAN 4 2016.
Web of Science Citations: 9
Abstract

Two effective methods to prepare reduced graphene oxide (rGO)/hematite nanostructured photoanodes and their photoelectrochemical characterization towards water splitting reactions are presented. First, graphene oxide (GO) is reduced to rGO using hydrazine in a basic solution containing tetrabutylammonium hydroxide (TBAOH), and then deposited over the nanostructured hematite photoanodes previously treated at 750 degrees C for 30min. The second method follows the deposition of a paste containing a mixture of hematite nanoparticles and rGO sheets by the doctor-blade method, varying the rGO concentration. Since hematite suffers from low electron mobility, a low absorption coefficient, high recombination rates and slow reaction kinetics, the incorporation of rGO in the hematite can overcome such limitations due to graphene's exceptional properties. Using the first method, the rGO incorporation results in a photocurrent density increase from 0.56 to 0.82mAcm(-2) at 1.23 V-RHE. Our results indicate that the rGO incorporation in the hematite photoanodes shows a positive effect in the reduction of the electron-hole recombination rate. (AU)

FAPESP's process: 12/24270-4 - Synthesis and characterization of alfa-Fe2O3/reduced graphene oxide in photodegradation of water for hydrogen generation
Grantee:Saulo do Amaral Carminati
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 11/19924-2 - Study and development of advanced novel materials: electronic, magnetic and nanostructured: an interdisciplinary approach
Grantee:Carlos Rettori
Support Opportunities: Research Projects - Thematic Grants