Highly Active NaTaO3 -Based Photocatalysts for CO2 Reduction to Form CO Using Water as the Electron Donor.

Doped NaTaO3 (NaTaO3 :A, where A=Mg, Ca, Sr, Ba, or La) has arisen as a highly active photocatalyst for CO2 reduction to simultaneously form CO, H2 , and O2 using water as the electron donor when used with an Ag cocatalyst, under UV irradiation, and with 1 atm (0.1 MPa) of CO2 . The ratio of the number of reacted electrons/holes was almost unity, indicating that water was consumed as the electron donor. A liquid-phase reduction method for loading of the Ag cocatalyst was superior to photodeposition and impregnation methods. The Ag cocatalyst-loaded NaTaO3 :Ba was the most active photocatalyst in water with no required additives. The addition of bases, such as hydrogencarbonate, was effective to enhance the CO formation for Mg-, Ca-, Sr-, Ba-, and La-doped NaTaO3 photocatalysts with an Ag cocatalyst. Ca- and Sr-doped NaTaO3 photocatalysts showed especially high activity along with the Ba-doped photocatalyst in the aqueous NaHCO3 solution. The selectivity for the CO formation [CO/(CO+H2 )] on Ca-, Sr-, and Ba-doped NaTaO3 photocatalysts with Ag cocatalyst reached around 90 %.

[1]  D. Serrano,et al.  CO_2 reduction over NaNbO_3 and NaTaO_3 perovskite photocatalysts , 2017, Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology.

[2]  R. Amal,et al.  Water Splitting and CO2 Reduction under Visible Light Irradiation Using Z-Scheme Systems Consisting of Metal Sulfides, CoOx-Loaded BiVO4, and a Reduced Graphene Oxide Electron Mediator. , 2016, Journal of the American Chemical Society.

[3]  Tsunehiro Tanaka,et al.  A ZnTa2O6 photocatalyst synthesized via solid state reaction for conversion of CO2 into CO in water , 2016 .

[4]  B. Viswanathan,et al.  Photocatalytic reduction of carbon dioxide in alkaline medium on La modified sodium tantalate with different co-catalysts under UV–Visible radiation , 2016 .

[5]  Tsunehiro Tanaka,et al.  Tuning the selectivity toward CO evolution in the photocatalytic conversion of CO2 with H2O through the modification of Ag-loaded Ga2O3 with a ZnGa2O4 layer , 2016 .

[6]  Maor F. Baruch,et al.  Light-Driven Heterogeneous Reduction of Carbon Dioxide: Photocatalysts and Photoelectrodes. , 2015, Chemical reviews.

[7]  T. Kajino,et al.  Calcium titanate photocatalyst prepared by a flux method for reduction of carbon dioxide with water , 2015 .

[8]  Tsunehiro Tanaka,et al.  Highly efficient photocatalytic conversion of CO2 into solid CO using H2O as a reductant over Ag-modified ZnGa2O4 , 2015 .

[9]  Jinhua Ye,et al.  Highly efficient and stable photocatalytic reduction of CO2 to CH4 over Ru loaded NaTaO3. , 2015, Chemical communications.

[10]  Tsunehiro Tanaka,et al.  Photocatalytic conversion of CO2 in water over Ag-modified La2Ti2O7 , 2015 .

[11]  A. Kudo,et al.  Photocatalytic Water Splitting and CO2 Reduction over KCaSrTa5O15 Nanorod Prepared by a Polymerized Complex Method , 2015 .

[12]  Z. Wang,et al.  Photocatalytic Conversion of CO2 by H2O over Ag-Loaded SrO-Modified Ta2O5 , 2015 .

[13]  Y. Nakano,et al.  Effect of CO2 Bubbling into Aqueous Solutions Used for Electrochemical Reduction of CO2 for Energy Conversion and Storage , 2015 .

[14]  A. Kudo,et al.  The KCaSrTa5O15 photocatalyst with tungsten bronze structure for water splitting and CO2 reduction. , 2014, Physical chemistry chemical physics : PCCP.

[15]  Z. Wang,et al.  A doping technique that suppresses undesirable H2 evolution derived from overall water splitting in the highly selective photocatalytic conversion of CO2 in and by water. , 2014, Chemistry.

[16]  Etosha R. Cave,et al.  Insights into the electrocatalytic reduction of CO₂ on metallic silver surfaces. , 2014, Physical chemistry chemical physics : PCCP.

[17]  Muhammad Tahir,et al.  Advances in visible light responsive titanium oxide-based photocatalysts for CO2 conversion to hydrocarbon fuels , 2013 .

[18]  Can Li,et al.  Effects of Zn2+ and Pb2+ dopants on the activity of Ga2O3-based photocatalysts for water splitting. , 2013, Physical chemistry chemical physics : PCCP.

[19]  T. Peng,et al.  Recent advances in the photocatalytic CO2 reduction over semiconductors , 2013 .

[20]  Akihiko Kudo,et al.  Enhanced photocatalytic water splitting by BaLa4Ti4O15 loaded with ∼1 nm gold nanoclusters using glutathione-protected Au25 clusters. , 2013, Nanoscale.

[21]  Jacek K. Stolarczyk,et al.  Photocatalytic reduction of CO2 on TiO2 and other semiconductors. , 2013, Angewandte Chemie.

[22]  L. Schmidt-Mende,et al.  Photokatalytische Reduktion von CO 2 an TiO 2 und anderen Halbleitern , 2013 .

[23]  A. Kudo,et al.  The effect of Au cocatalyst loaded on La-doped NaTaO3 on photocatalytic water splitting and O2 photoreduction , 2013 .

[24]  Can Li,et al.  Photocatalytic overall water splitting promoted by an α-β phase junction on Ga2O3. , 2012, Angewandte Chemie.

[25]  A. Kudo,et al.  Photocatalytic reduction of carbon dioxide over Ag cocatalyst-loaded ALa4Ti4O15 (A = Ca, Sr, and Ba) using water as a reducing reagent. , 2011, Journal of the American Chemical Society.

[26]  Somnath C. Roy,et al.  Toward solar fuels: photocatalytic conversion of carbon dioxide to hydrocarbons. , 2010, ACS nano.

[27]  A. Kudo,et al.  The effect of alkaline earth metal ion dopants on photocatalytic water splitting by NaTaO(3) powder. , 2009, ChemSusChem.

[28]  A. Kudo,et al.  Water splitting into H2 and O2 over niobate and titanate photocatalysts with (111) plane-type layered perovskite structure , 2009 .

[29]  A. Kudo,et al.  Formation of Surface Nano-step Structures and Improvement of Photocatalytic Activities of NaTaO3 by Doping of Alkaline Earth Metal Ions , 2004 .

[30]  Hideki Kato,et al.  Highly efficient water splitting into H2 and O2 over lanthanum-doped NaTaO3 photocatalysts with high crystallinity and surface nanostructure. , 2003, Journal of the American Chemical Society.

[31]  A. Kudo,et al.  Effect of lanthanide-doping into NaTaO3 photocatalysts for efficient water splitting , 2000 .

[32]  Toshio Tsukamoto,et al.  Electrocatalytic process of CO selectivity in electrochemical reduction of CO2 at metal electrodes in aqueous media , 1994 .

[33]  H. Arakawa,et al.  Effect of Na2CO3 addition on photocatalytic decomposition of liquid water over various semiconductor catalysis , 1994 .

[34]  Katsuhei Kikuchi,et al.  Production of CO and CH4 in electrochemical reduction of CO2 at metal electrodes in aqueous hydrogencarbonate solution. , 1985 .

[35]  A. Kudo,et al.  Heterogeneous photocatalyst materials for water splitting. , 2009, Chemical Society reviews.

[36]  H. Arakawa,et al.  Photocatalytic decomposition of water and photocatalytic reduction of carbon dioxide over zirconia catalyst , 1993 .