A self-doping strategy to improve the photoelectrochemical performance of Cu2ZnSnS4 nanocrystal films for water splitting

2019 ◽  
Vol 55 (82) ◽  
pp. 12396-12399 ◽  
Author(s):  
Xiaoyang Feng ◽  
Lulu Hou ◽  
Zhenxiong Huang ◽  
Rui Li ◽  
Jinwen Shi ◽  
...  
Keyword(s):  
Water Splitting ◽  
Conduction Band ◽  
Defect Level ◽  
Photoelectrochemical Performance ◽  
Band Shift ◽  
Shallow Defect ◽  
Nanocrystal Films

A self-doped CZTS photocathode showed improved PEC activity due to the conduction band shift and the formation of a shallow defect level.

One-Dimensional TiO2@GaON Core-Shell Nanowires with Controlled Shell Thickness from Atomic Layer Deposition for Stable and Efficient Photoelectrochemical Water Splitting

2019 ◽  
Author(s):  
Jiajia Tao ◽  
Hong-Ping Ma ◽  
Kaiping Yuan ◽  
Yang Gu ◽  
Jianwei Lian ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Band Gap ◽  
Water Splitting ◽  
Atomic Layer ◽  
Photoelectrochemical Water Splitting ◽  
Core Shell ◽  
Photoelectrochemical Performance ◽  
Highly Efficient ◽  
Layer Deposition ◽  
Shell Nanowires

<div>As a promising oxygen evolution reaction semiconductor, TiO2 has been extensively investigated for solar photoelectrochemical water splitting. Here, a highly efficient and stable strategy for rationally preparing GaON cocatalysts on TiO2 by atomic layer deposition is demonstrated, which we show significantly enhances the</div><div>photoelectrochemical performance compared to TiO2-based photoanodes. For TiO2@20 nm-GaON core-shell nanowires a photocurrent density up to 1.10 mA cm-2 (1.23 V vs RHE) under AM 1.5 G irradiation (100 mW cm-2) has been achieved, which is 14 times higher than that of TiO2 NWs. Furthermore, the oxygen vacancy formation on GaON as well as the band gap matching with TiO2 not only provides more active sites for water oxidation but also enhances light absorption to promote interfacial charge separation and migration. Density functional theory studies of model systems of GaON-modified TiO2 confirm the band gap reduction, high reducibility and ability to activate water. The highly efficient and stable systems of TiO2@GaON core-shell nanowires provide a deeper understanding and universal strategy for enhancing photoelectrochemical performance of photoanodes now available. </div>

Defective Fe3+ self-doped spinel ZnFe2O4 with oxygen vacancies for highly efficient photoelectrochemical water splitting

2019 ◽  
Vol 48 (31) ◽  
pp. 11934-11940 ◽  
Author(s):  
Jianmin Wang ◽  
Yunan Wang ◽  
Xinchao Xv ◽  
Yan Chen ◽  
Xi Yang ◽  
...  
Keyword(s):  
Water Splitting ◽  
Oxygen Vacancies ◽  
Photoelectrochemical Water Splitting ◽  
Photoelectrochemical Performance ◽  
Highly Efficient

Defective Fe3+ self-doped spinel ZnFe2O4 with abundant oxygen vacancies exhibits largely enhanced photoelectrochemical performance.

Electrospinning to Prepare Nanostructured Photocatalysts and Photoelectrodes

2018 ◽  
Vol MA2018-01 (31) ◽  
pp. 1905-1905
Author(s):  
Marcus Einert ◽  
André Bloesser ◽  
Roland Marschall
Keyword(s):  
Charge Carrier ◽  
Metal Oxide ◽  
Water Splitting ◽  
Indium Tin Oxide ◽  
Layered Perovskite ◽  
Fast Method ◽  
Photoelectrochemical Performance ◽  
Electrospinning Technique ◽  
Solar Water Splitting ◽  
Defect Sites

Electrospinning is a well-known, simple and fast method to prepare polymer fibers with diameters of 100-500 nm and lengths up to several micrometers.[1] Since for many semiconductor materials the charge carrier diffusion length is a critical parameter restricting photocatalytic or photoelectrochemical performance, we use the electrospinning approach to prepare nanostructured metal oxide nanofibers.[2] Directly after electrospinning, such nanofibers still contain spinning polymer, after calcination crystalline metal oxide nanofibers with diameter of 100-200 nm can be prepared.[3] Using the electrospinning technique, it is also possible to prepare fibrous photoelectrodes directly onto conducting substrates in a one step process.[4,5] Nanofibers of the (111)-layered perovskite materials Ba5Ta4O15 are built up from small single crystals, and are able to generate hydrogen without any co-catalyst in photocatalytic reformation of methanol. After photodeposition of Rh-Cr2O3 co-catalysts, the nanofibers show better activity in overall water splitting compared to sol–gel-derived powders.[3] Hollow a-Fe2O3 nanofibers and core–shell-like a-Fe2O3/indium-tin oxide (ITO) nanofiber composites were utilized as a photoanode for solar water splitting, the latter showing a doubled photocurrent compared to the hollow fiber photoanodes. This can be most likely be attributed to fast interfacial charge carrier exchange between the highly conductive ITO nanoparticles and a-Fe2O3, thus inhibiting the recombination of the electron–hole pairs in the semiconductor by spatial separation.[4] CuO photocathodes were directly prepared via electrospinning onto FTO, and calcination studies were performed to systematically characterize their crystallographic and structural evolution.[5] The higher the annealing temperature, the more developed are the crystalline domains of the nanofibers, which results in better conductivity and less defect sites serving as trap states for the photo-excited charge carriers. Hence, the CuO nanofiber photocathodes annealed at 800 °C showed the highest photoresponse and stability. No decrease in the photocurrent density after prolonged operation in aqueous electrolyte was observed. References [1] A. Greiner, J. H. Wendorff, Angew. Chem. Int. Ed. 2007, 46, 5670-5703. [2] R. Ostermann, J. Cravillon, C. Weidmann, M. Wiebcke, B. M. Smarsly, Chem. Commun. 2011, 47, 442-444. [3] N. C. Hildebrandt, J. Soldat, R. Marschall, Small 2015, 11, 2051–2057. [4] M. Einert, R. Ostermann, T. Weller, S. Zellmer, G. Garnweitner, B. M. Smarsly, R. Marschall, J. Mater. Chem. A 2016, 4, 18444-18456. [5] M. Einert, T. Weller, T. Leichtweiss, B. M. Smarsly, R. Marschall, Chem. Photo. Chem. 2017, 1, 326-340. Figure 1

Construction of Ti3+ self-doped TiO2/BCN heterojunction with enhanced photoelectrochemical performance for water splitting

2018 ◽  
Vol 30 (3) ◽  
pp. 2006-2015
Author(s):  
Zheng Liang ◽  
Junqi Li ◽  
Nan Lei ◽  
Liu Guo ◽  
Qianqian Song
Keyword(s):  
Water Splitting ◽  
Photoelectrochemical Performance ◽  
Doped Tio2

Photoelectrochemical water splitting at low applied potential using a NiOOH coated codoped (Sn, Zr) α-Fe2O3 photoanode

2015 ◽  
Vol 3 (11) ◽  
pp. 5949-5961 ◽  
Author(s):  
Andebet Gedamu Tamirat ◽  
Wei-Nien Su ◽  
Amare Aregahegn Dubale ◽  
Hung-Ming Chen ◽  
Bing-Joe Hwang
Keyword(s):  
Water Splitting ◽  
Photoelectrochemical Water Splitting ◽  
Applied Potential ◽  
Photoelectrochemical Performance ◽  
Onset Potential

We synthesized a NiOOH decorated codoped (Sn, Zr) α-Fe2O3 photoanode that results in enhanced photoelectrochemical performance and drastically lower onset potential.

scholarly journals Efficient Photoelectrochemical Performance of γ Irradiated g-C3N4 and Its g-C3N4@BiVO4 Heterojunction for Solar Water Splitting

2019 ◽  
Vol 123 (14) ◽  
pp. 9013-9026 ◽  
Author(s):  
Nurul Aida Mohamed ◽  
Habib Ullah ◽  
Javad Safaei ◽  
Aznan Fazli Ismail ◽  
Mohamad Firdaus Mohamad Noh ◽  
...  
Keyword(s):  
Water Splitting ◽  
Photoelectrochemical Performance ◽  
Solar Water ◽  
Solar Water Splitting

Tunable surface modification of a hematite photoanode by a Co(salen)-based cocatalyst for boosting photoelectrochemical performance

2020 ◽  
Vol 10 (6) ◽  
pp. 1714-1723
Author(s):  
Ruiling Wang ◽  
Yasutaka Kuwahara ◽  
Kohsuke Mori ◽  
Yuyu Bu ◽  
Hiromi Yamashita
Keyword(s):  
Surface Modification ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Photoelectrochemical Performance

A water splitting photoanode composed of hematite (α-Fe2O3) nanorods modified with Co(salen) was proven to exhibit special photoelectrochemical oxygen evolution activity.

Preparation and enhanced photoelectrochemical performance of selenite-sensitized zinc oxide core/shell composite structure

2015 ◽  
Vol 3 (8) ◽  
pp. 4239-4247 ◽  
Author(s):  
Tiantian Hong ◽  
Zhifeng Liu ◽  
Hui Liu ◽  
Junqi Liu ◽  
Xueqi Zhang ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Ion Exchange ◽  
Chemical Synthesis ◽  
Water Splitting ◽  
Low Cost ◽  
Core Shell ◽  
Nanorod Arrays ◽  
Photoelectrochemical Performance ◽  
Vertically Aligned ◽  
Shell Composite

A fast, versatile and low-cost hydrothermal chemical synthesis based on ion-exchange has been used to deposit a shell of cupric selenite onto vertically aligned zinc oxide nanorod arrays with a buffer layer of zinc selenite for photoelectrochemical water splitting.

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