scholarly journals Protagonists and spectators during photocatalytic solar water splitting with SrTaOxNy oxynitride

2021 ◽  
Author(s):  
Craig Lawley ◽  
Zahra Pourmand Tehrani ◽  
Adam Hugh Clark ◽  
Olga V. Safonova ◽  
Max Döbeli ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Grazing Incidence ◽  
Operating Conditions ◽  
Photoelectrochemical Cell ◽  
Light Water ◽  
X Ray ◽  
Solar Water ◽  
Solar Water Splitting

Oxynitrides have been shown to be promising visible light water splitting photocatalysts, but rapidly degrade under operating conditions. With a custom designed photoelectrochemical cell, we perform operando grazing incidence X-ray...

scholarly journals Protagonists and spectators during photocatalytic solar water splitting with SrTaOxNy oxynitride

2021 ◽  
Author(s):  
Craig Lawley ◽  
Zahra Pourmand Tehrani ◽  
Adam Clark ◽  
Olga Safonova ◽  
Max Doebeli ◽  
...  
Keyword(s):  
Water Splitting ◽  
Rational Design ◽  
Grazing Incidence ◽  
Operating Conditions ◽  
Photoelectrochemical Cell ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Species Formation ◽  
Invaluable Tool ◽  
A Site

Abstract Oxynitrides have been shown to be promising visible light water splitting photocatalysts, but rapidly degrade under operating conditions. With a custom designed photoelectrochemical cell, we perform operando grazing incidence X-ray absorption spectroscopy measurements on the oxynitride semiconductor SrTaOxNy during photocatalytic solar water splitting. We show that the nature of the A-site (Sr) and its evolution during operation, have large impacts on the overall stability and catalytic acitivity of the material, leading to an enriched BO2 (Ta(OH)/TaO(OH)) like surface. However, this usually beneficial effect with respect to increased surface hydrophilicity has complications for the efficiency of the photocatalytic process, as the OH and O(OH) intermediates formed are in competition between O2 generation and NOx species formation in the initial stages of operation. Operando characterisation of the evolution of the electronic structure of the photocatalyst proves to be an invaluable tool for the rational design and discovery of new and better performing materials.

Carrier Engineering of Zr-mediated Ta3N5 Film as Efficient Photoanode for Solar Water Splitting

2021 ◽  
Author(s):  
Xin Zou ◽  
Xueyang Han ◽  
Chengxiong Wang ◽  
Yunkun Zhao ◽  
Chun Du ◽  
...  
Keyword(s):  
Band Structure ◽  
Visible Light ◽  
Water Splitting ◽  
Light Absorption ◽  
Photoelectrochemical Water Splitting ◽  
Promising Candidate ◽  
Visible Light Absorption ◽  
Solar Water ◽  
Solar Water Splitting

Ta3N5 is regarded as a promising candidate material with adequate visible light absorption and band structure for photoelectrochemical water splitting. However, the performance of Ta3N5 is severely limited by the...

scholarly journals Integrated Membrane-Electrode-Assembly Photoelectrochemical Cell under Various Feed Conditions for Solar Water Splitting

2018 ◽  
Vol 166 (5) ◽  
pp. H3020-H3028 ◽  
Author(s):  
Tobias A. Kistler ◽  
David Larson ◽  
Karl Walczak ◽  
Peter Agbo ◽  
Ian D. Sharp ◽  
...  
Keyword(s):  
Water Splitting ◽  
Membrane Electrode Assembly ◽  
Photoelectrochemical Cell ◽  
Membrane Electrode ◽  
Solar Water ◽  
Solar Water Splitting

Visible light active and noble metal free Nb4N5/TiO2 nanobelt surface heterostructure for plasmonic enhanced solar water splitting

2020 ◽  
Vol 402 ◽  
pp. 126226 ◽  
Author(s):  
Yanchen Ji ◽  
Ruiqi Yang ◽  
Longwei Wang ◽  
Guoxin Song ◽  
Aizhu Wang ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Noble Metal ◽  
Metal Free ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Visible Light Active

Significant Improvements on BiVO4@CoPi Photoanode Solar Water Splitting Performance by Extending Visible-Light Harvesting Capacity and Charge Carrier Transportation

2020 ◽  
Vol 3 (5) ◽  
pp. 4474-4483 ◽  
Author(s):  
D. Amaranatha Reddy ◽  
Yujin Kim ◽  
Hyung Seop Shim ◽  
K. Arun Joshi Reddy ◽  
Madhusudana Gopannagari ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Visible Light ◽  
Water Splitting ◽  
Light Harvesting ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Carrier Transportation

scholarly journals Combinatorial Search for New Solar Water Splitting Photoanode Materials in the Thin-Film System Fe–Ti–W–O

2020 ◽  
Vol 234 (5) ◽  
pp. 867-885 ◽  
Author(s):  
Swati Kumari ◽  
Chinmay Khare ◽  
Fanxing Xi ◽  
Mona Nowak ◽  
Kirill Sliozberg ◽  
...  
Keyword(s):  
Thin Film ◽  
Water Splitting ◽  
Spin Coating ◽  
Photocurrent Density ◽  
Coated Sample ◽  
X Ray Diffraction ◽  
Film Library ◽  
X Ray ◽  
Solar Water ◽  
Solar Water Splitting

AbstractIn order to identify new solar water splitting photoanodes, Fe–Ti–W–O materials libraries were fabricated by combinatorial reactive co-sputtering and investigated by high-throughput characterization methods to elucidate compositional, thickness, and structural properties. In addition, photoelectrochemical measurements such as potentiodynamic photocurrent determination and open circuit potential measurements were performed using an automated scanning droplet cell. In the thin-film library, a quaternary photoactive region Fe30–49Ti29–55W13–22Ox was identified as a hit composition region, comprising binary and ternary phases. The identified region shows a distinct surface morphology with larger grains (∼200 nm) being embedded into a matrix of smaller grains (∼80–100 nm). A maximum photocurrent density of 117 μA/cm2 at a bias potential of 1.45 V vs. RHE in NaClO4 as an electrolyte under standard solar simulating conditions was recorded. Additional samples with compositions from the hit region were fabricated by reactive co-sputtering and spin coating followed by annealing. Synchrotron X-ray diffraction of sputtered Fe32Ti52W16Ox thin-films, annealed in air (600 °C, 700 °C, 800 °C) revealed the presence of the phases FeTiO3 and Ti0.54W0.46O2. The composition Fe48Ti30W22Ox from the hit region was fabricated by spin coating and subsequent annealing for a detailed investigation of its structure and photoactivity. After annealing the spin-coated sample at 650 °C for 6 h, X-ray diffraction results showed a dominant pattern with narrow diffraction lines belonging to a distorted FeWO4 (ferberite) phase along with broad diffraction lines addressed as Fe2TiO5 and in a small fraction also, Fe1.7Ti0.23O3. In hematite, Fe can be substituted by Ti, therefore we suggest that in the newfound ferberite-type phase, Ti partially substitutes for Fe leading to a small lattice distortion and a doubling of the monoclinic unit cell. In addition, Na from the substrate stabilizes the new phase: its tentative chemical formula is NaxFe0.33Ti0.67W2O8. A maximum photocurrent density of around 0.43 mA/cm2 at 1.45 V vs. RHE in 1M NaOH (pH ∼ 13.6) as an electrolyte was measured. Different aspects of the dependence of annealing and precursor solution concentration on phase transformation and photoactivity are discussed.

Visible-light-driven photocatalytic carbon-doped porous ZnO nanoarchitectures for solar water-splitting

Nanoscale ◽  
2012 ◽  
Vol 4 (20) ◽  
pp. 6515 ◽  
Author(s):  
Yan-Gu Lin ◽  
Yu-Kuei Hsu ◽  
Ying-Chu Chen ◽  
Li-Chyong Chen ◽  
San-Yuan Chen ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Carbon Doped ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Visible Light Driven

Fully solution-processable Cu2O–BiVO4 photoelectrochemical cells for bias-free solar water splitting

2018 ◽  
Vol 20 (16) ◽  
pp. 3732-3742 ◽  
Author(s):  
Hyunwoo Kim ◽  
Sanghyun Bae ◽  
Dasom Jeon ◽  
Jungki Ryu
Keyword(s):  
Water Splitting ◽  
Photoelectrochemical Cell ◽  
Simple Solution ◽  
Photoelectrochemical Cells ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Solution Processes ◽  
Solution Processable

An efficient and stable bias-free photoelectrochemical cell was readily fabricated using only simple solution processes.

Sign in / Sign up

Export Citation Format

Share Document