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Abstract New narrow band gap semiconductor cobalt titanate (CoTiO 3 ) nanorods are fabricated via an ethylene glycol‐mediated route and further calcination in air. The glycolate precursors and porous CoTiO 3 nanorods are investigated in detail by using SEM, TEM, XRD, thermogravimetric, FTIR, and UV/Vis spectroscopy and N 2 adsorption–desorption isotherm. The effect of calcining temperature is also studied, and 700 °C is found to be the optimal calcining temperature used to prepare porous CoTiO 3 nanorods with high crystallinity and porosity as well as excellent photocatalytic performance in water oxidation under visible light irradiation. The highest oxygen production yield is up to 64.6 μmol h −1 without co‐catalysts. The high photocatalytic activity for oxygen production is ascribed to the following reasons: 1) the large surface area, which favors absorption and offers more active sites, 2) the suitable narrow band gap, which can use more solar energy, and 3) the 1 D structure, which leads to good electron transport.
Qu et al. (Mon,) studied this question.