Flux method fabrication of potassium rare-earth tantalates for CO2 photoreduction using H2O as an electron donor

摘要: Abstract A facile one-pot flux method was applied to fabricate K2RETa5O15 (RE = rare-earth element) with tetragonal tungsten bronze (TTB) structures. Pure TTB structures of (RE = La, Ce, Pr, Nd, and Sm) rod-like morphologies were obtained using KCl as the potassium source flux. For other rare-earth tantalates, structure dominant, an additional RETaO4 phase present. Among all these K2RETa5O15, K2YTa5O15 gave highest activity for photoreduction CO2 good selectivity toward CO evolution H2O electron donor, even in presence YTaO4 phase. fabricated under same condition inactive H2O. It found that be significantly affected by weight ratio chloride yttrium oxide tantalum (K/YT) fabrication process. The achieved 91.9 μmol h−1 (for 1.0-g catalyst), 84.9%, at K/YT = 1.0. Surface analysis tantalates different K/YT ratios showed a high surface (Y/Ta) important achieve rate.