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Abstract  

Ca2Fe2O5 was prepared by a sol–gel method and loaded with nickel by an impregnation method. The catalyst NiO/Ca2Fe2O5 was studied in the photocatalytic splitting of water in the presence of carbon dioxide. It is found that the photocatalytic activity increased markedly when CO2 was bubbled into the water. It is believed that CO2 may react with water to form HCO3 and CO3 2−, which promote the scavenging of h+ by HO·, and thus enhance the photocatalytic activity. At the same time, a portion of CO2 is photocatalytically reduced to formic acid.

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dopant concentrations. The deposition of Ni on N–TiO 2 resulted in a substantial improvement in the H 2 evolution. In Fig. 8 , Ni–N–TiO 2 (10, 20, 50, 100 μmol of Ni) samples showed much higher photocatalytic activity compared with undoped N–TiO 2

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energy of light Table 1 The photocatalytic H 2 evolution performance of Cd x Zn 1− x S solid solutions

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of these materials (with the same Pd content) decreases from 111 mV (samples without Pd) to 36 mV (samples with 20% Pd). Table 2 Response potentials ( E st ), H 2 evolution potentials ( E H2 ) and electric

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