Bridging interfacial water structure and reactivity in photocatalytic hydrogen evolution at TiO₂ interfaces
Hydrogen (H2) evolution via photocatalytic water splitting is an environmentally friendly and sustainable technology for solar-to-chemical energy conversion. Although interfacial interactions are recognized as key determinants of photocatalytic performance, systematic experimental studies explicitly targeting the structure and reactivity of the water-catalyst interface remain limited. A major…
A new study published in The Journal of Physical Chemistry Letters has shed light on the relationship between the structure and reactivity of interfacial water at TiO2 photocatalyst interfaces. Contrary to previous beliefs, weaker interactions between water and TiO2 surfaces may actually enhance photocatalytic activity rather than suppress it.
This finding challenges the conventional wisdom that strong water-TiO2 interactions are favorable for photocatalysis. The research team discovered that more flexible hydrogen-bond networks within interfacial water also contribute to higher reactivity. These insights provide a molecular understanding of the initial water oxidation step, which is critical for photocatalytic hydrogen evolution.
The study suggests that photocatalyst design should consider controlling the molecular structure and dynamics of interfacial water to optimize its reactivity.
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