Investigation of bulk carrier diffusion dynamics using β-Mn2V2−xMoxO7 photoanodes in solar water splitting

2021 ◽  
Vol 540 ◽  
pp. 148376
Author(s):  
Selvaraj Seenivasan ◽  
Hee Moon ◽  
Do-Heyoung Kim
Keyword(s):  
Water Splitting ◽  
Bulk Carrier ◽  
Carrier Diffusion ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Diffusion Dynamics

scholarly journals Electrochemical Fabrication of Cu2O-Nanowires-based Photo-cathodes for Enhanced Solar Water Splitting

2018 ◽  
Author(s):  
Iqra Reyaz Hamdani ◽  
Ashok N. Bhaskarwar
Keyword(s):  
Charge Carrier ◽  
Water Splitting ◽  
Light Harvesting ◽  
Radial Distance ◽  
Nanowire Arrays ◽  
Carrier Diffusion ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Charge Carrier Diffusion ◽  
Cu Foil

Solar-power driven photoelectrochemical (PEC) water splitting using semiconductor photoelectrodes is one of the most promising approaches for energy conversion, in terms of production of renewable hydrogen with a minimum carbon footprint. There are, however, enormous challenges to be overcome to obtain sufficient solar water-splitting efficiency, such as over-potential losses due to fast recombination rates of charge carriers, electrode photo-degradation, limited light-harvesting capacities, to name a few. In this work, we report an extensive study on Cu2O based photocathode for hydrogen evolution reaction (HER) in terms of enhancing its solar-to-hydrogen (STH) conversion efficiency, while using low-cost fabrication methods. We have addressed the inefficiency of Cu2O which mainly arises due to incompatible light absorption and charge carrier diffusion lengths, by fabricating highly reproducible Cu2O-nanowire arrays on Cu substrate. The reported optimal thickness of Cu2O for efficient absorption of sunlight is around 2-4 µm, while the minority charge carrier diffusion length is limited to 200-250 nm only. The nanostructured Cu2O, especially in the form of nanowire arrays, improves its performance through morphology control, by improving the light-harvesting capacity along the full length of wire and providing a shorter diffusion path length corresponding to the radial distance in the wire, towards the electrolyte. We prepared the photocathode by anodizing Cu foil to Cu(OH)2 nanowires at 10 mA/cm2, followed by oxidation to Cu2O nanowires in an inert atmosphere. Experimental measurements showed that the process was highly reproducible and resulted in an increased current density from -0.5 mA/cm2 for planar Cu2O to -82.3 mA/cm2 for Cu2O nanowires, both at 0.9 V cathodic bias. The photocurrent density was enhanced from -0.15 mA/cm2 for planar Cu2O to -5.54 mA/cm2 for the nanowire morphology, while using visible light source in all cases. All the photoelectrodes were reproducible in the regime of 4 µm thicknesses of Cu2O nanowires, oxidized over Cu-foil substrates. The STH efficiency calculated for all the fabricated photoelectrodes was as high as 3.54% ± 0.21%, in comparison to 0.24% for the planar Cu2O photoelectrodes.

Combinatorial Fabrication and High-Throughput Characterization of Thin Film Metal Oxide Libraries for Solar water Splitting

2018 ◽  
Author(s):  
Alfred Ludwig ◽  
Mona Nowak ◽  
Swati Kumari ◽  
Helge S. Stein ◽  
Ramona Gutkowski ◽  
...  
Keyword(s):  
Thin Film ◽  
Metal Oxide ◽  
Water Splitting ◽  
High Throughput ◽  
Solar Water ◽  
Solar Water Splitting

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 Kesterite Cu2ZnSnS4 thin-film solar water-splitting photovoltaics for solar seawater desalination

2021 ◽  
Vol 2 (6) ◽  
pp. 100468
Author(s):  
Lintao Li ◽  
Chenyang Wang ◽  
Kuang Feng ◽  
Dingwang Huang ◽  
Kang Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Water Splitting ◽  
Seawater Desalination ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Cu2znsns4 Thin Film

3.17% efficient Cu2ZnSnS4–BiVO4 integrated tandem cell for standalone overall solar water splitting

2021 ◽  
Author(s):  
Dingwang Huang ◽  
Kang Wang ◽  
Lintao Li ◽  
Kuang Feng ◽  
Na An ◽  
...  
Keyword(s):  
Water Splitting ◽  
Large Scale ◽  
Tandem Cell ◽  
Solar Water ◽  
Solar Water Splitting ◽  
First Time

3.17% efficient Cu2ZnSnS4–BiVO4 integrated tandem cell and a large scale 5 × 5 cm integrated CZTS–BiVO4 tandem device for standalone overall solar water splitting was assembled for the first time.

scholarly journals Plasmonic Metal Nanostructures as Efficient Light Absorbers for Solar Water Splitting

2021 ◽  
pp. 2100092
Author(s):  
Yawen Wang ◽  
Junchang Zhang ◽  
Wenkai Liang ◽  
Wei Qin ◽  
Yinghui Sun ◽  
...  
Keyword(s):  
Water Splitting ◽  
Metal Nanostructures ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Light Absorbers
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