Climate change mitigation on a global scale will only be possiblethrough the achievement of ambitious decarbonisation goals,requiring an energy transition that involves switching from fossilfuels to clean fuels such as hydrogen. The photocatalytic approachis one of the most studied methods for directly converting sunlightinto hydrogen. In this work, we present the synthesis, character-ization, and application of the PTZ1-HA dye, which was obtainedby replacing the terminal conventional carboxylic anchoringmoieties of a previously studied phenothiazine-based dye (PTZ1)with hydroxamic acid functionalities. The photoinduced perform-ance of the two dyes as photosensitizers was compared in bothdye-sensitized solar cells and dye-sensitized photocatalytic systems.PTZ1-HA-sensitized photocatalysts showed improved stability inhydrogen generation due to the introduction of the hydroxamicacid as an alternative anchor group, which was shown to slowdown hydrolysis in aqueous media. Even though the light harvest-ing ability of PTZ1-HA was lower than that of PTZ1, the higherstability of PTZ1-HA-sensitized devices allowed for improved photo-catalytic generation of H2 over prolonged periods. The superiorlong-term efficiency of the hydroxamic acid based dye is importantin view of potential practical applications.
Enhanced Long‐Term Stability of a Photosensitizer with a Hydroxamic Acid Anchor in Dye‐Sensitized Photocatalytic Hydrogen Generation
Salerno, Giorgia;
2023
Abstract
Climate change mitigation on a global scale will only be possiblethrough the achievement of ambitious decarbonisation goals,requiring an energy transition that involves switching from fossilfuels to clean fuels such as hydrogen. The photocatalytic approachis one of the most studied methods for directly converting sunlightinto hydrogen. In this work, we present the synthesis, character-ization, and application of the PTZ1-HA dye, which was obtainedby replacing the terminal conventional carboxylic anchoringmoieties of a previously studied phenothiazine-based dye (PTZ1)with hydroxamic acid functionalities. The photoinduced perform-ance of the two dyes as photosensitizers was compared in bothdye-sensitized solar cells and dye-sensitized photocatalytic systems.PTZ1-HA-sensitized photocatalysts showed improved stability inhydrogen generation due to the introduction of the hydroxamicacid as an alternative anchor group, which was shown to slowdown hydrolysis in aqueous media. Even though the light harvest-ing ability of PTZ1-HA was lower than that of PTZ1, the higherstability of PTZ1-HA-sensitized devices allowed for improved photo-catalytic generation of H2 over prolonged periods. The superiorlong-term efficiency of the hydroxamic acid based dye is importantin view of potential practical applications.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
