TY - JOUR
T1 - Influence of the Solvent Used for Microwave-Assisted Synthesis of W−BiVO4 on Properties and Photoelectroactivity of W−BiVO4/WO3
AU - Scola Rodrigues, Barbara
AU - Branco, Carolyne M.
AU - Vicente, Marcos R.S.
AU - Rodríguez-López, Joaquín
AU - dos Santos de Souza, Juliana
N1 - This work was supported by FAPESP (grants 2017/11395‐7, 2019/00904‐3, and 2019/26010‐9) and by the Lemann Center for Brazilian Studies of the University of Illinois at Urbana‐Champaign through a Lemann Collaborative Research Grant. This study was also financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001 and by the CAPES‐Print Project “Optimization of transformation processes aiming technological advances in analysis methodologies and on the preparation of nanoparticles and electrocatalysts” (grant 88881.310334/2018‐01). The authors also acknowledge Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). Finally, we are thankful to LNNano‐CNPEM for using the SEM facility, to LNLS‐CNPEM for the XRD experiments, and to the Multi‐users platform (CEM) at UFABC for instrumental facilities.
This work was supported by FAPESP (grants 2017/11395-7, 2019/00904-3, and 2019/26010-9) and by the Lemann Center for Brazilian Studies of the University of Illinois at Urbana-Champaign through a Lemann Collaborative Research Grant. This study was also financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001 and by the CAPES-Print Project “Optimization of transformation processes aiming technological advances in analysis methodologies and on the preparation of nanoparticles and electrocatalysts” (grant 88881.310334/2018-01). The authors also acknowledge Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). Finally, we are thankful to LNNano-CNPEM for using the SEM facility, to LNLS-CNPEM for the XRD experiments, and to the Multi-users platform (CEM) at UFABC for instrumental facilities.
PY - 2022/8/26
Y1 - 2022/8/26
N2 - W−BiVO4 and WO3 are promising photoanodes for the oxygen evolution reaction (OER). The synthesis procedure determines morphology, composition, and consequently, the photo(electro)chemical performance. W−BiVO4 was produced through a microwave-assisted hydrothermal method, using ethanol (EtOH) or ethylene glycol (EG) as solvents, resulting in the materials W−BiVO4(EtOH) and (BiVO4(EG), respectively. WO3 films were grown onto a conductor substrate under microwave-assisted hydrothermal conditions. W−BiVO4/WO3 was prepared through drop-casting and applied as photoanodes for OER. Morphology, crystalline structure, chemical composition, and band gap energy were evaluated. Also, the electrochemical behavior and interfacial properties were investigated via surface interrogation (SI-SECM). It has been observed that the photoelectroactivity of W−BiVO4(EG)/WO3 is 16 times higher than W−BiVO4(EtOH)/WO3 due to its favorable band edge alignment toward OER. SI-SECM showed that W−BiVO4(EtOH)/WO3 exhibited a surface coverage of reactive oxygen species four times higher than W−BiVO4(EG)/WO3. The contrasting reactivity was ascribed to differences in morphology and crystalline structure of W−BiVO4.
AB - W−BiVO4 and WO3 are promising photoanodes for the oxygen evolution reaction (OER). The synthesis procedure determines morphology, composition, and consequently, the photo(electro)chemical performance. W−BiVO4 was produced through a microwave-assisted hydrothermal method, using ethanol (EtOH) or ethylene glycol (EG) as solvents, resulting in the materials W−BiVO4(EtOH) and (BiVO4(EG), respectively. WO3 films were grown onto a conductor substrate under microwave-assisted hydrothermal conditions. W−BiVO4/WO3 was prepared through drop-casting and applied as photoanodes for OER. Morphology, crystalline structure, chemical composition, and band gap energy were evaluated. Also, the electrochemical behavior and interfacial properties were investigated via surface interrogation (SI-SECM). It has been observed that the photoelectroactivity of W−BiVO4(EG)/WO3 is 16 times higher than W−BiVO4(EtOH)/WO3 due to its favorable band edge alignment toward OER. SI-SECM showed that W−BiVO4(EtOH)/WO3 exhibited a surface coverage of reactive oxygen species four times higher than W−BiVO4(EG)/WO3. The contrasting reactivity was ascribed to differences in morphology and crystalline structure of W−BiVO4.
KW - Metal oxides
KW - Microwave-assisted synthesis
KW - Photo(electro)catalytic properties
KW - Scanning electrochemical microscopy
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U2 - 10.1002/celc.202200098
DO - 10.1002/celc.202200098
M3 - Article
AN - SCOPUS:85137122434
SN - 2196-0216
VL - 9
JO - ChemElectroChem
JF - ChemElectroChem
IS - 16
M1 - e202200098
ER -