Preparation and photoelectrocatalysis performance of Pt doped mesoporous TiO₂/conductive carbon felt photoelectrode

Based on employing the TiCl₄, cetyltrimethyl ammonium bromide, chloroplatinic acid and conductive carbon felt as titanium source, template agent, doping-ion and carrier, respectively, the precursor solution of liquid crystal-Pt ion-inorganic titanium was prepared by hydrothermal synthesis method. The photoelectrode of Pt doped mesoporous TiO₂/conductive carbon felt (TiO₂-Pt/CCF) was obtained by the dip-coating method with the aid of ultrasonic system under nitrogen protection. The obtained TiO₂-Pt/CCF was characterized by modern analytical tools. The photoelectrocatalytic performance of material was analyzed by degradation of benzaldehyde, and the photoelectrocatalytic synergistic mechanism was analyzed. The results show that the mesoporous processing can increase the specific surface area of TiO₂-Pt/CCF, enlarge the degradation reaction area, and increase the concentration of catalyst surface degradation product; the metal ion doping can bring impurity level, reduce the band gap of TiO₂, at the same time, Pt acts as a photo-electron and hole trap, and inhibits the electron and hole recombine, improves the photoelectrocatalytic activity of TiO₂-Pt/CCF; the TiO₂ loading can enhance the absorption and the surface electron transfer of target degradation product. Under the multilateral collaborative modified, TiO₂-Pt/CCF has higher catalytic activity than noporous TiO₂/CCF and mesoporous TiO₂/CCF.