Enhanced photocatalytic CO2 reduction via the synergistic effect between Ag and activated carbon in TiO2 /AC-Ag ternary composite


Scientific Achievement

 The activated carbon not only leads to enhanced CO2 adsorption capacity due to its properties and high surface area but also makes the electron transfer to its surface due to similar conductivity to metals derived from diverse electronic structures of activated carbon, thereby suppressing the recombination of photo-generated electron and hole pairs. (2) The oxidation reaction sites of H2O are located on the surface of TiO2 and the reduction reaction sites of CO2 are on the surface of activated carbon; the effective separation of two reaction sites remarkably inhibited the reverse reaction during CO generation. (3) The surface plasmon resonance (SPR) of Ag enables the materials to absorb light in a broader spectrum. 

Significance and Impact

  We assembled TiO2/AC-Ag ternary composite structure to simultaneously increase CO2 uptake, extend the light absorption edge, and reduce the recombination of electrons and holes via synergistic effect of AC and metal Ag. This design explored a new approach for the application of biomass carbon and is very valuable for further practical application of photocatalytic CO2 reduction.

Research Details

  The TiO2/AC-5-Ag composite photocatalyst was prepared via using ultrasonic and situ photodeposition methods;

  The prepared samples were characterized by SEM, TEM, DSR, BET, PL and so on;

  The CO2 photo-reduction activities of samples were performed via the photocatalytic system.


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研究方向:纳米材料; 光催化产氢;人工光合作用(催化CO2转化为有机能源; 生物基碳材料在光催化CO2转化, 锂/钠电池中的应用; 预水解液中木质素的分离及利用; 木质素的光催化转化。


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