Impact of water adsorption on the H2 formation rate and interfacial H-bonds for the brookite TiO2 photocatalyst (TIO19PB). (IMAGE)
Caption
(a) Change in the rate of hydrogen formation through photocatalytic water splitting when the number of water layers (amount of adsorbed water molecules) is systematically changed under various water vapor pressures. (b) The dependency of the O−H stretching band area on the number of water layers (black: total spectrum area, green: spectrum area of interfacial water component, blue: spectrum area of liquid-like water component). The spectrum of the interfacial water component, which shows a spectral shape clearly different from that of bulk liquid water, is nearly saturated in area at two molecular layers, while the liquid-like water component, which shows a spectral shape almost the same as that of bulk liquid water, increases when water molecules are adsorbed in layers thicker than three. (c) Change in the O-H vibration spectrum of the interfacial water component induced by the adsorption of more than three molecular layers of water.
Credit
Zhongqiu LIN, Toshiki Sugimoto
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CC BY