Minimal Lanthanum-doping triggered enhancement in bifunctional water splitting activity of molybdenum oxide/sulfide heterostructure through structural evolution

Experimental and DFT calculation results show that the presence of oxygen vacancies can decrease the adsorption energy of intermediates at active sites and facilitate their adsorption, thus improving the catalytic properties.

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Spin State as a Marker for the Structural Evolution of Nature’s Water-Splitting Catalyst

Inorganic Chemistry ◽

10.1021/acs.inorgchem.5b02578 ◽

2015 ◽

Vol 55 (2) ◽

pp. 488-501 ◽

Cited By ~ 56

Author(s):

Vera Krewald ◽

Marius Retegan ◽

Frank Neese ◽

Wolfgang Lubitz ◽

Dimitrios A. Pantazis ◽

...

Keyword(s):

Water Splitting ◽

Spin State ◽

Structural Evolution

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Effect of La doping on the structural and electrical properties of SrBi2Ta2O9

MRS Proceedings ◽

10.1557/proc-811-d3.24 ◽

2004 ◽

Vol 811 ◽

Cited By ~ 1

Author(s):

Ortega Nora ◽

S. Bhattacharyya ◽

P. Bhattacharya ◽

R.R. Das ◽

R.S. Katiyar

Keyword(s):

Electrical Properties ◽

Structural Evolution ◽

Phase Segregation ◽

X Ray Diffraction ◽

Lanthanum Doping ◽

X Ray ◽

La Doping ◽

Structural And Electrical Properties ◽

Vibrational Characteristics ◽

La Substitution

ABSTRACTThe effect of anthanum substitution (0-20%) on phase formation, structural evolution and electrical properties of SrBi2Ta2O9 (SBT) ceramics were investigated. X-ray diffraction studies revealed that phase pure SBT bulk samples can be synthesized with lanthanum doping without any phase segregation. Raman spectroscopy was used to understand the lattice vibrational characteristics of La substituted SBT compound. The ferroelectric soft mode at 27 cm−1 was shifted towards the lower frequencies at room temperature with increase in La concentrations. The octahedral stretching mode (O-Ta-O) did not influenced by La substitution in SBT. The x-ray photoemission spectroscopy measurements showed the decrease of binding energy of Bi 4f core levels (5/2 and 7/2) upon La substitution in SBT. The dielectric constant was increased from 120 to 190 up to 10% La doping and decreased with further increase in La concentration.

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High-performance bifunctional Fe-doped molybdenum oxide-based electrocatalysts with in situ grown epitaxial heterojunctions for overall water splitting

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2020.06.283 ◽

2020 ◽

Vol 45 (46) ◽

pp. 24828-24839 ◽

Cited By ~ 2

Author(s):

Jian Chen ◽

Qingle Zeng ◽

Xiaopeng Qi ◽

Bojun Peng ◽

Liang Xu ◽

...

Keyword(s):

Water Splitting ◽

Molybdenum Oxide ◽

High Performance ◽

Overall Water Splitting

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Ceria Based Materials with Enhanced OSC Properties for H2 Production by Water Splitting Reaction

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.93.76 ◽

2014 ◽

Vol 93 ◽

pp. 76-81 ◽

Cited By ~ 5

Author(s):

Alfonsina Pappacena ◽

Marta Boaro ◽

Olga Šolcová ◽

Alessandro Trovarelli

Keyword(s):

Water Splitting ◽

Storage Capacity ◽

Synthesis Method ◽

Structural Evolution ◽

Aging Treatment ◽

Oxygen Storage Capacity ◽

Oxygen Storage ◽

Thermo Stability ◽

Potential Use ◽

Surfactant Assisted

A novel surfactant-assisted synthesis method was developed in our laboratory to enhance the oxygen storage capacity (OSC) and the thermo stability of a TWC catalyst based on zirconia and rare earth oxides. The same procedure was used to prepare ceria-zirconia compositions with different amount of ceria, either undoped or doped with La and Nd. The potential use of these materials in a two steps solar thermochemical water splitting cycle for the production of H2 was investigated. For this proposal the O2 release of the materials was measured through thermogravimetric analysis in N2 at 1573K. Then all prepared compositions were subjected to an aging treatment at temperature above 1573K in air or in N2 flow and their activity in producing H2 via water splitting at 1073K was evaluated with respect their structural evolution. The results obtained highlight that the reactivity depends on the temperature and atmosphere of the treatments and on the composition. The best result was obtained for the ceria rich composition treated at 1573K in N2 and for the corresponding doped composition treated in air.

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