Photocatalysis, converting solar energy into chemical energy, has been recognized to be a very promising solution to current energy and environmental issues. The performance of the photocatalytic system depends largely on the surface charge state of active sites (usually co-catalysts), as the Schottky junction between photosensitizer and co-catalyst facilitates charge transfer between them and finally to reactant molecules, promoting the adsorption and activation of the latter.
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Source: Phys.org