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Among the plentiful semiconductor catalysts,TiO2 photocatalysts are one type of attractive and promising materials due to their excellent properties such as a high photocatalytic activity,stability,and non-toxicity.The newly developed TiO2 nanotube arrays show great advantages in comparison to a particulate film when preparing an immobilized photocatalytic electrode.TiO2 nanotube arrays possess larger surface area,faster electron transport and lower recombination rate,enabling us to achieve a higher photocatalytic activity and efficiency.