Zn1-xCoxO vs Ag-ZnO photoanodes design via combustion: Characterization and application in photoelectrocatalysis

Autor(es)

Lucilha, Adriana Campano ^[1] ; Camargo, Luan Pereira ^[1] ; Liberatti, Vanessa Rocha ^[1] ; Melo Barbosa, Eduardo Cesar ^[1] ; Dall'Antonia, Luiz Henrique ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Londrina, Lab Eletroquim & Mat, Dept Quim, Ctr Ciencias Exatas, CP 6001, BR-86051990 Londrina, Parana - Brazil

• Tipo de documento: Artigo Científico
• Fonte: COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS; v. 638, APR 5 2022.
• Citações Web of Science: 0

Resumo

In this work, different synthetic conditions were analyzed to prepare modified ZnO photoelectrodes, in order to prevent the recombination of their photogenerated charge carriers and thus allow the continuous formation of electrons and holes on photoelectrocatalytic reactions. Thus, an investigation was carried out by the chemical modification using cobalt and surface modification using silver, as well as the final heat treatment temperature, to monitor its effects onto the properties of this semiconductor oxide. In this context, Zn1-xCoxO and Ag-ZnO photoelectrodes were produced from combustion synthesis and prepared simply and efficiently, directly on the indium tin oxide (ITO) surface. These material modifications were efficient to improve the properties of pure ZnO, and the presence of silver on the ZnO surface provided significantly superior photoelectrochemical and photoelectrocatalytic responses for methylene blue discoloration. Zn1-xCoxO presented a current density of 132 mu A cm(-2 )and kinetic discoloration constant of 9.05 x 10(-3) min(-1), and Ag-ZnO displayed a current density of 162 mu A cm(-2) and kinetic discoloration constant of 15.0 x 10(-3) min(-1). Among the ZnO modification conditions, the addition of 2.0% (mol L-1) of a metal nitrate precursor (either Co or Ag) and thermal treatment at 600 degrees C provided the best responses to the photoelectrodes. (AU)

• Processo FAPESP: 14/50867-3 - INCT 2014: Instituto Nacional de Ciência e Tecnologia de Bioanalítica
• Beneficiário: Marco Aurelio Zezzi Arruda
• Modalidade de apoio: Auxílio à Pesquisa - Temático