scholarly journals Ag-Functionalized CuWO4/WO3 nanocomposites for solar water splitting

2019 ◽  
Vol 43 (5) ◽  
pp. 2196-2203 ◽  
Author(s):  
R. Salimi ◽  
A. A. Sabbagh Alvani ◽  
B. T. Mei ◽  
N. Naseri ◽  
S. F. Du ◽  
...  
Keyword(s):  
Water Splitting ◽  
Electrophoretic Deposition ◽  
Sol Gel ◽  
Photocurrent Density ◽  
Solar Water ◽  
Solar Water Splitting

A new plasmonic Ag-functionalized CuWO4/WO3 hetero-structured photoanode was successfully prepared via a PVP-assisted sol–gel (PSG) route and electrophoretic deposition which reveals 4 times enhanced photocurrent density compared with pristine WO3.

Solar-Water-Splitting BiVO4 Thin-Film Photoanodes Prepared By Using a Sol-Gel Dip-Coating Technique

ChemPhotoChem ◽  
2017 ◽  
Vol 1 (6) ◽  
pp. 273-280 ◽  
Author(s):  
Samantha Hilliard ◽  
Dennis Friedrich ◽  
Stéphane Kressman ◽  
Henri Strub ◽  
Vincent Artero ◽  
...  
Keyword(s):  
Thin Film ◽  
Water Splitting ◽  
Sol Gel ◽  
Dip Coating ◽  
Solar Water ◽  
Coating Technique ◽  
Solar Water Splitting ◽  
Dip Coating Technique

A Three-Dimensional ZnO/CdS/NiFe Layered Double Hydroxide Photoanode Coupled with a Cu2O Photocathode in a Tandem Cell for Overall Solar Water Splitting

NANO ◽  
2019 ◽  
Vol 14 (11) ◽  
pp. 1950146
Author(s):  
Jia Liu ◽  
Yinghua Zhang ◽  
Zhiming Bai ◽  
Zhian Huang ◽  
Yukun Gao ◽  
...  
Keyword(s):  
Water Splitting ◽  
Layered Double Hydroxide ◽  
Three Dimensional ◽  
Photocurrent Density ◽  
Cds Nanoparticles ◽  
Zero Bias ◽  
Tandem Cell ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Double Hydroxide

An integrated tandem photoelectrochemical (PEC) cell, composed of a three-dimensional (3D) ZnO/CdS/NiFe layered double hydroxide (LDH) core/shell/hierarchical nanowire arrays (NWAs) photoanode and a [Formula: see text]-Cu2O photocathode, was designed for unassisted overall solar water splitting in this study. The optical and photoelectrochemical characteristics of ZnO-based photoanodes and Cu2O photocathode were investigated. The results show that ZnO/CdS/NiFe LDH nanostructures offer significantly enhanced performances with a photocurrent density reaching 5.8[Formula: see text]mA[Formula: see text][Formula: see text][Formula: see text]cm[Formula: see text] at 0.9[Formula: see text]V and an onset potential as early as 0.1[Formula: see text]V (versus RHE). The enhancement can be attributed to the existence of CdS nanoparticles (NPs) which boosts the light absorption in visible region and enhances charge separation. Moreover, the introduction of NiFe LDH nanoplates, with unique hierarchical mesoporous architecture, promotes electrochemical reactions by providing more active sites as co-catalyst. On the above basis, the ZnO/CdS/NiFe LDH–Cu2O two-electrode tandem cell system was established. At zero bias, the device shows a photocurrent density of 0.4[Formula: see text]mA[Formula: see text][Formula: see text][Formula: see text]cm[Formula: see text] along with the corresponding solar-to-hydrogen (STH) conversion efficiency reaching 0.50%. Our results indicate that the tandem PEC cells consisting of metal–oxide–semiconductor photoelectrodes based on Earth-abundant and low-cost materials hold promising application potential for overall solar water splitting.

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.

Large area high-performance bismuth vanadate photoanode for efficient solar water splitting

2020 ◽  
Vol 8 (7) ◽  
pp. 3845-3850 ◽  
Author(s):  
Meirong Huang ◽  
Wenhai Lei ◽  
Min Wang ◽  
Shuji Zhao ◽  
Changli Li ◽  
...  
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
High Performance ◽  
Large Scale ◽  
Photocurrent Density ◽  
Large Area ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Harsh Conditions ◽  
Density Of Water

Large-scale BiVO4 photoanodes were prepared for solar water splitting. A photocurrent density of water oxidation of ∼2.23 mA cm−2 at 1.23 VRHE and ∼0.83% conversion efficiency at 0.65 VRHE were achieved, with <4% decay after 5 h of operation under harsh conditions.

Synthesis of Zinc Oxide Thin Films by Modified Sol-Gel Route for Solar Water Splitting

2016 ◽  
Vol 1133 ◽  
pp. 38-42 ◽  
Author(s):  
Nurulnadia Sarip ◽  
Sharul Ashikin Kamaruddin ◽  
Farhanahani Mahmud ◽  
Siti Nooraya Mohd Tawil ◽  
Mohd Zainizan Sahdan
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Water Splitting ◽  
Sol Gel ◽  
Zno Nanorods ◽  
Zinc Salt ◽  
Homogeneous Surface ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Vertically Aligned

Zinc oxide (ZnO) is one of the promising candidates for solar water splitting application. Due to immerging of nanotechnology, ZnO nanostructures have been extensively studied and the properties are still under debate. Vertically aligned ZnO nanorods (NRs) offer higher surface-to-volume ration compared to other shapes and become the most seeked by researches ever since. The facile growth of vertically aligned ZnO NRs thin films out of two different zinc salt, namely , zinc acetate and zinc nitrate using the modified sol-gel route were performed with the assistant of ultrasonic rinse. Sonication of ZnO NRs thin films has significant improvement on the structural and optical properties. Several sonication periods have been employed to synthesize these ZnO NRs thin films. Deposited ZnO NRs films were characterized under FE-SEM, AFM, XRD and UV-Vis. Comparative investigation performed on acetate and nitrate precursor materials showed a preferable (0 0 2) with homogeneous surface formation single crystal growth, high quality transparent thin film of 3.23 eV in acetate precursor material at 30 seconds sonication were reported in this paper.

Spatial engineering of a Co(OH)x encapsulated p-Cu2S/n-BiVO4 photoanode: simultaneously promoting charge separation and surface reaction kinetics in solar water splitting

2019 ◽  
Vol 7 (12) ◽  
pp. 6747-6752 ◽  
Author(s):  
Bing He ◽  
Yang Wang ◽  
Xueqin Liu ◽  
Yinchang Li ◽  
Xiaoqin Hu ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Water Splitting ◽  
Charge Separation ◽  
Surface Reaction ◽  
Separation Efficiency ◽  
Photocurrent Density ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Charge Separation Efficiency ◽  
Surface Reaction Kinetics

An ultrathin Co(OH)x coated p-Cu2S/n-BiVO4 heterojunction photoanode with improved charge separation efficiency was prepared, showing a photocurrent density of 3.51 mA cm−2.

Fabrication of TiO2/CuO photoelectrode with enhanced solar water splitting activity

2017 ◽  
Vol 10 (06) ◽  
pp. 1750084 ◽  
Author(s):  
Timur Sh. Atabaev ◽  
Dae Hun Lee ◽  
Nguyen Hoa Hong
Keyword(s):  
Water Splitting ◽  
Spin Coating ◽  
Pulsed Laser ◽  
Photocurrent Density ◽  
Laser Deposition ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Density Enhancement ◽  
Bilayered Structure ◽  
Harvesting Efficiency

A bilayered TiO2/CuO photoelectrode was fabricated on a fluorine-doped tin oxide FTO substrate by spin-coating and pulsed laser deposition methods. The prepared bilayered system was assessed as a photoelectrode for solar water splitting. The fabricated TiO2/CuO photoelectrode exhibited a higher photocurrent density (0.022[Formula: see text]mA/cm2 at 1.23[Formula: see text]V vs. RHE) compared to bare TiO2 photoelectrode (0.013[Formula: see text]mA/cm2 at 1.23[Formula: see text]V vs. RHE). This photocurrent density enhancement was attributed to the improved charge separation combined with the improved sunlight harvesting efficiency of a bilayered structure.

Unique 3D heterojunction photoanode design to harness charge transfer for efficient and stable photoelectrochemical water splitting

2015 ◽  
Vol 8 (4) ◽  
pp. 1348-1357 ◽  
Author(s):  
Jungang Hou ◽  
Huijie Cheng ◽  
Osamu Takeda ◽  
Hongmin Zhu
Keyword(s):  
Charge Transfer ◽  
Water Splitting ◽  
Photocurrent Density ◽  
Photoelectrochemical Water Splitting ◽  
Solar Water ◽  
Solar Water Splitting

The hierarchically CoOxdecorated 2D C3N4nanosheet–1D/2D nanorod/nanosheet-assembled barium-doped TaON array as 3D heterojunction photoanode exhibited the enhanced photocurrent density and durable photostability for photoelectrochemical solar water splitting.

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