Пожалуйста, помогите перевести термин: sacrificial electron donor

Контекст:
The preparation and characterisation of a novel, UV-activated solvent-based, colourimetric indicator for O2 is described, comprising a redox dye (methylene blue, MB), semiconductor photocatalyst (TiO2), and a sacrificial electron donor (SED), all dispersed/dissolved in a polymer medium (sulfonated polystyrene, SPS).

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