Abstract
Photocatalytic technology for hydrogen evolution and pollutants degradation may bring huge economic benefits due to its resolution for environmental pollution and energy shortage by utilizing natural solar light and thus attract more and more attention to materials researchers. However, up to now, it is still far away from practical application due to low photo quantum efficiency. The fast recombination of the photogenerated electrons and holes are key factors to influence potocatalytic efficiency. The separation and migration efficiency of photocatalysts are commonly characterized by electrochemical impedance spectra (EIS) and transient photocurrent responses. Yet, various plots have been presented especially in transient photocurrent responses spectra, such as spike peaks, negative peaks, exponential type peaks, and so on, which have not been fully explained. In our experiments, by changing the applied potentials, adding different hole scavengers, these phenomena could be avoided.
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