Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 14, Pages 7653-7660Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b00440
Keywords
hematite; solar energy; photoelectrocatalysis; water oxidation; methanol oxidation; electrochemical impedance spectroscopy
Funding
- National Science Foundation [CHE-1150378]
- Ministerio de Ciencia e Innovacion (MICINN) of Spain (Consolider HOPE) [CSD2007-00007]
- Generalitat Valenciana [PROMETEO/2009/058]
- Generalitat Valenciana (Institute of Nanotechnologies for Clean Energies)) [ISIC/2012/008]
- University Jaume I- Bancaixa [P1.1B2011-50]
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Photocatalytic water and methanol oxidation were studied at thin film hematite electrodes synthesized by atomic layer deposition (ALD). Systematic photoelectrochemical characterization along with O-2 evolution measurements were carried out in order to better understand the mechanisms of both water and methanol oxidation at hematite electrodes. When both water and methanol are present in the solution, they are oxidized competitively with each other, allowing the detection and assignment of distinct surface states characteristic to each process. The measurement of different surface states for methanol and water oxidation, along with the absence of measurable surface states in an inert acetonitrile electrolyte, clearly shows that the detected surface states are chemically distinct reaction intermediates of water or methanol oxidation.
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