Performance of enhanced DuBois type water reduction catalysts (WRC) in artificial photosynthesis – effects of various proton relays during catalysis

2019 ◽  
Vol 215 ◽  
pp. 141-161 ◽  
Author(s):  
Wolfgang Viertl ◽  
Johann Pann ◽  
Richard Pehn ◽  
Helena Roithmeyer ◽  
Marvin Bendig ◽  
...  
Keyword(s):  
Oxidation State ◽  
Artificial Photosynthesis ◽  
Metal Oxidation ◽  
Water Reduction ◽  
Coordination Site ◽  
Proton Relay ◽  
Additional Coordination ◽  
Type Water ◽  
Reduction Catalysts

A pincer type ligand provides an additional coordination site or a proton relay depending on the metal oxidation state.

Phosphines in artificial photosynthesis: considering different aspects such as chromophores, water reduction catalysts (WRCs), water oxidation catalysts (WOCs), and dyads

2019 ◽  
Vol 3 (11) ◽  
pp. 2926-2953 ◽  
Author(s):  
J. Pann ◽  
H. Roithmeyer ◽  
W. Viertl ◽  
R. Pehn ◽  
M. Bendig ◽  
...  
Keyword(s):  
Complex Systems ◽  
Water Oxidation ◽  
Artificial Photosynthesis ◽  
Phosphine Ligands ◽  
Coordination Complex ◽  
Oxidation Catalysts ◽  
Water Reduction ◽  
Stereoelectronic Properties ◽  
Reduction Catalysts

Coordination complex systems containing phosphine ligands are used in artificial photosynthesis utilizing their unique stereoelectronic properties. Mono-, di- and tetraphosphines act as optimized ligand systems for complexation.

scholarly journals Two-Dimensional, Hierarchical Ag-Doped TiO2 Nanocatalysts: Effect of the Metal Oxidation State on the Photocatalytic Properties

ACS Omega ◽  
2018 ◽  
Vol 3 (3) ◽  
pp. 2579-2587 ◽  
Author(s):  
Siti Khatijah Md Saad ◽  
Akrajas Ali Umar ◽  
Marjoni Imamora Ali Umar ◽  
Masahiko Tomitori ◽  
Mohd. Yusri Abd. Rahman ◽  
...  
Keyword(s):  
Oxidation State ◽  
Photocatalytic Properties ◽  
Two Dimensional ◽  
Metal Oxidation ◽  
Doped Tio2

Synthesis and characterisation of transition metal substituted barium hollandite ceramics

2006 ◽  
Vol 932 ◽  
Author(s):  
Neil C. Hyatt ◽  
Martin C. Stennett ◽  
Steven G. Fiddy ◽  
Jayne S. Wellings ◽  
Sian S. Dutton ◽  
...  
Keyword(s):  
Transition Metal ◽  
Oxidation State ◽  
Powder Diffraction ◽  
Single Phase ◽  
Maximum Density ◽  
Processing Conditions ◽  
Metal Oxidation ◽  
Exafs Data ◽  
X Ray ◽  
Oxygen Atoms

ABSTRACTA range of transition metal bearing hollandite phases, formulated Ba1.2B1.2Ti6.8O16 (B2+ = Mg, Co, Ni, Zn, Mn) and Ba1.2B2.4Ti5.6O16 (B3+ = Al, Cr, Fe) were prepared using an alkoxide - nitrate route. X-ray powder diffraction demonstrated the synthesis of single phase materials for all compositions except B = Mn. The processing conditions required to produce > 95 % dense ceramics were determined for all compositions, except B = Mg for which the maximum density obtained was > 93 %. Analysis of transition metal K-edge XANES data confirmed the presence of the targeted transition metal oxidation state for all compositions except B = Mn, where the overall oxidation state was found to be Mn3+. The K-edge EXAFS data of Ba1.2B1.2Ti6.8O16 (B = Ni and Co) were successfully analysed using a crystallographic model of the hollandite structure, with six oxygen atoms present in the first co-ordination shell at a distance of ca. 2.02Å. Analysis of Fe K-edge EXAFS data of Ba1.2B2.4Ti5.4O16 revealed a reduced co-ordination shell of five oxygens at ca. 1.99Å.

Mechanistic Study of Photocatalytic Hydrogen Generation with Simple Iron Carbonyls as Water Reduction Catalysts

ChemCatChem ◽  
2015 ◽  
Vol 8 (2) ◽  
pp. 404-411 ◽  
Author(s):  
Steffen Fischer ◽  
Olga S. Bokareva ◽  
Enrico Barsch ◽  
Sergey I. Bokarev ◽  
Oliver Kühn ◽  
...  
Keyword(s):  
Hydrogen Generation ◽  
Mechanistic Study ◽  
Water Reduction ◽  
Iron Carbonyls ◽  
Photocatalytic Hydrogen Generation ◽  
Reduction Catalysts

X-ray absorption to determine the metal oxidation state of transition metal compounds

2013 ◽  
Author(s):  
J. Jiménez-Mier ◽  
P. Olalde-Velasco ◽  
G. Carabalí-Sandoval ◽  
G. Herrera-Pérez ◽  
E. Chavira ◽  
...  
Keyword(s):  
Transition Metal ◽  
Oxidation State ◽  
Transition Metal Compounds ◽  
Metal Oxidation ◽  
Metal Compounds ◽  
X Ray ◽  
X Ray Absorption
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