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← ScienceWhich outcome occurs when a photoexcited catalyst undergoes rapid electron-hole recombination?
A)Decreased photocatalytic reaction efficiency✓
B)Enhanced charge carrier separation
C)Increased light absorption spectrum
D)Improved quantum yield drastically
💡 Explanation
Electron-hole recombination leads to energy dissipation as heat, rather than promoting chemical reactions, because it involves electrons relaxing back to lower energy orbitals which is the reverse of photoexcitation. Therefore, photocatalytic efficiency decreases rather than enhancing charge separation.
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