Discovering a selective semimetal element to increase hematite photoanode charge separation efficiency

This work describes a colloidal deposition process that exploits the thermal spreading ability of Sb over a hematite surface to obtain a mesoporous film with extensive open porosity and high degree of Sb 5+ dispersion. The addition of Sb increased the efficiency of water oxidation by a factor of 4.5...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (28), p.16992-16998
Main Authors: Nogueira, André Esteves, Santos Soares, Mario Rodrigo, Souza Junior, João Batista, Ospina Ramirez, Carlos Alberto, Souza, Flavio Leandro, Leite, Edson Roberto
Format: Article
Language:English
Subjects:
Antimony
Charge efficiency
Colloiding
Dispersion
Efficiency
Hematite
Oxidation
Photoanodes
Photoelectric effect
Photoelectric emission
Porosity
Separation
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Summary:This work describes a colloidal deposition process that exploits the thermal spreading ability of Sb over a hematite surface to obtain a mesoporous film with extensive open porosity and high degree of Sb 5+ dispersion. The addition of Sb increased the efficiency of water oxidation by a factor of 4.5 and photocurrent at 1.23 V RHE by a factor of 6.5 compared to those of an unmodified hematite film prepared under the same conditions. The overall efficiency increase for water oxidation is attributed to more efficient charge separation. Sb was found to be an excellent selective semimetal modifier with high dispersion over the material. A colloidal deposition process combined with the thermal spreading ability of Sb over hematite surface is used to obtain a mesoporous photoanode for water oxidation.
ISSN:2050-7488
2050-7496
DOI:10.1039/c9ta05452a