Publication
Defect engineered nanostructured LaFeO3 photoanodes for improved activity in solar water oxidation
Kevin Sivula, Mounir Driss Mensi, Liang Yao, Nestor Guijarro Carratala, Yongpeng Liu, Xavier Pereira Da Costa
2021
Journal paper
2021
Journal paper
Abstract
LaFeO3 (LFO) is recognized as a candidate material for solar water oxidation, but its photoelectrochemical response remains modest and stagnant. With the aim of advancing LFO photoanodes for the oxygen evolution reaction (OER), here, a nanorod array-type electrode combined with defect and surface engineering protocols has been demonstrated, delivering a benchmark performance of 0.4 mA cm−2 at 1.23 V vs. RHE with an onset potential below 0.55 V vs. RHE. It was found that oxygen defects activated the surface towards OER, while NiFeOx coating suppressed surface recombination. It was discovered, however, that the performance was limited by rapid (nanosecond timescale) bulk recombination, as well as the ultrashort hole diffusion length (
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Related concepts (30)
Oxygen
Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. Oxygen is Earth's most abundant element, and after hydrogen and helium, it is the third-most abundant element in the universe. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula O2.
Chemical reaction
A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Classically, chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can often be described by a chemical equation. Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reactions of unstable and radioactive elements where both electronic and nuclear changes can occur.
Oxygen-18
Oxygen-18 (18O, Ω) is a natural, stable isotope of oxygen and one of the environmental isotopes. 18O is an important precursor for the production of fluorodeoxyglucose (FDG) used in positron emission tomography (PET). Generally, in the radiopharmaceutical industry, enriched water (H218O) is bombarded with hydrogen ions in either a cyclotron or linear accelerator, producing fluorine-18. This is then synthesized into FDG and injected into a patient. It can also be used to make an extremely heavy version of water when combined with tritium (hydrogen-3): 3H218O or T218O.
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