Design of multi-layered TiO2–Fe2O3 photoanodes for photoelectrochemical water splitting: patterning effects on photocurrent density

2016 ◽  
Vol 6 (04) ◽  
pp. 442-448 ◽  
Author(s):  
Myeongwhun Pyeon ◽  
Meng Wang ◽  
Yakup Gönüllü ◽  
Ali Kaouk ◽  
Sara Jäckle ◽  
...  
Keyword(s):  
Water Splitting ◽  
Photocurrent Density ◽  
Photoelectrochemical Water Splitting ◽  
Image Position

Abstract

Enhancing the quasi-theoretical photocurrent density of ZnO nanorods via a lukewarm hydrothermal method

Nanoscale ◽  
2020 ◽  
Vol 12 (23) ◽  
pp. 12292-12299
Author(s):  
Ying-Chu Chen ◽  
Zhi-Jie Wu ◽  
Yu-Kuei Hsu
Keyword(s):  
Hydrothermal Method ◽  
Water Splitting ◽  
Light Harvesting ◽  
Zno Nanorods ◽  
Photocurrent Density ◽  
Photoelectrochemical Water Splitting ◽  
Harvesting Efficiency ◽  
Light Harvesting Efficiency

Anti-reflection enhanced the light harvesting efficiency of a ∼10-μm-long 1D ZnO NRA, which is evidently manifested in the quasi-theoretical photocurrent density that reached ∼0.9 mA cm−2 for solar photoelectrochemical water splitting.

A g-C3N4/WO3 photoanode with exceptional ability for photoelectrochemical water splitting

2017 ◽  
Vol 1 (2) ◽  
pp. 338-342 ◽  
Author(s):  
Haibo Li ◽  
Fengyi Zhao ◽  
Jincheng Zhang ◽  
Lei Luo ◽  
Xujing Xiao ◽  
...  
Keyword(s):  
Water Splitting ◽  
Photocurrent Density ◽  
Photoelectrochemical Water Splitting ◽  
Pec Water Splitting

g-C3N4/WO3 heterojunctions with exceptional ability and stability for photoelectrochemical (PEC) water splitting which achieved a high photocurrent density.

Sandwich structured WO3 nanoplatelets for highly efficient photoelectrochemical water splitting

2019 ◽  
Vol 7 (45) ◽  
pp. 26077-26088 ◽  
Author(s):  
Guangwei Zheng ◽  
Jinshu Wang ◽  
Guannan Zu ◽  
Haibing Che ◽  
Chen Lai ◽  
...  
Keyword(s):  
Water Splitting ◽  
Photocurrent Density ◽  
Photoelectrochemical Water Splitting ◽  
Highly Efficient ◽  
Pec Water Splitting

Promising PEC water splitting activity with a photocurrent density of 3.16 mA cm−2 at 1.23 V vs. RHE was demonstrated in sandwich structured WO3 with exposed highly reactive (002) facet and superior crystallinity of 2-D nanoplatelets.

scholarly journals Effects of flux synthesis on SrNbO2N particles for photoelectrochemical water splitting

2016 ◽  
Vol 4 (20) ◽  
pp. 7658-7664 ◽  
Author(s):  
Masanori Kodera ◽  
Haruki Urabe ◽  
Masao Katayama ◽  
Takashi Hisatomi ◽  
Tsutomu Minegishi ◽  
...  
Keyword(s):  
Water Splitting ◽  
Photocurrent Density ◽  
Photoelectrochemical Water Splitting ◽  
Flux Synthesis ◽  
P Flux

Flux synthesized SrNbO2N photoanode exhibited a photocurrent density of 1.5 mA cm−2 at 1.23 VRHE under AM 1.5G irradiation.

scholarly journals Transferred monolayer MoS2 onto GaN for heterostructure photoanode: Toward stable and efficient photoelectrochemical water splitting

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Mostafa Afifi Hassan ◽  
Min-Woo Kim ◽  
Muhammad Ali Johar ◽  
Aadil Waseem ◽  
Min-Ki Kwon ◽  
...  
Keyword(s):  
Water Splitting ◽  
Alternative Energy ◽  
Chemical Vapor ◽  
Photocurrent Density ◽  
Charge Transfer Resistance ◽  
Photoelectrochemical Water Splitting ◽  
Organic Chemical ◽  
Transfer Resistance ◽  
Alternative Energy Sources ◽  
New Perspective

AbstractSolar-driven photoelectrochemical water splitting (PEC-WS) using semiconductor photoelectrodes is considered a promising solution for sustainable, renewable, clean, safe and alternative energy sources such as hydrogen. Here, we report the synthesis and characterization of a novel heterostructure MoS2/GaN to be used as a photoanode for PEC-WS. The heterostructure was synthesized by metal-organic chemical vapor deposition of single crystalline GaN onto a c-plane sapphire substrate, followed by the deposition of a visible light responding MoS2 monolayer (Eg = 1.9 eV) formed by a Mo-sulfurization technique. Our experimental results reveal that MoS2/GaN photoanode achieved efficient light harvesting with photocurrent density of 5.2 mA cm−2 at 0 V vs Ag/AgCl, which is 2.6 times higher than pristine GaN. Interestingly, MoS2/GaN exhibited a significantly enhanced applied-bias-photon-to-current conversion efficiency of 0.91%, whereas reference GaN yielded an efficiency of 0.32%. The superior PEC performance of the MoS2/GaN photoelectrode is mainly related to the enhanced light absorption due to excellent photocatalytic behavior of MoS2, which reduces charge transfer resistance between the semiconductor and electrolyte interface, and the improvement of charge separation and transport. This result gives a new perspective on the importance of MoS2 as a cocatalyst coated onto GaN to synthesize photoelectrodes for efficient solar energy conversion devices.

Assembling of Bi atoms on TiO2 nanorods boosts photoelectrochemical water splitting of semiconductors

Nanoscale ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 4302-4308 ◽  
Author(s):  
Yajun Pang ◽  
Wenjie Zang ◽  
Zongkui Kou ◽  
Lei Zhang ◽  
Guangqing Xu ◽  
...  
Keyword(s):  
Water Splitting ◽  
Photocurrent Density ◽  
Tio2 Nanorods ◽  
Photoelectrochemical Water Splitting ◽  
Co Catalyst ◽  
Pec Water Splitting

Atom-dispersed Bi metal along the TiO2 nanorods is properly designed as an efficiency co-catalyst to boost the photoelectrochemical (PEC) water splitting with a three-fold enhancement on photocurrent density.

scholarly journals Efficient Photoelectrochemical Water Splitting by Tailoring MoS2/CoTe Heterojunction in a Photoelectrochemical Cell

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2341
Author(s):  
Effat Sitara ◽  
Habib Nasir ◽  
Asad Mumtaz ◽  
Muhammad Fahad Ehsan ◽  
Manzar Sohail ◽  
...  
Keyword(s):  
Water Splitting ◽  
Electrochemical Impedance ◽  
Linear Sweep Voltammetry ◽  
Photocurrent Density ◽  
Photoelectrochemical Water Splitting ◽  
Photoelectrochemical Cell ◽  
Electron Hole ◽  
Pair Separation ◽  
Electron Hole Pair ◽  
Electrochemical Impedance Spectroscopic

Solar energy conversion through photoelectrochemical water splitting (PEC) is an upcoming promising technique. MoS2/CoTe heterostructures were successfully prepared and utilized for PEC studies. MoS2 and CoTe were prepared by a hydrothermal method which were then ultrasonicated with wt. % ratios of 1:3, 1:1 and 3:1 to prepare MoS2/CoTe (1:3), MoS2/CoTe (1:1) and MoS2/CoTe (3:1) heterostructure, respectively. The pure materials and heterostructures were characterized by XRD, UV–vis-DRS, SEM, XPS, PL and Raman spectroscopy. Photoelectrochemical measurements were carried out by linear sweep voltammetry and electrochemical impedance spectroscopic measurements. A maximum photocurrent density of 2.791 mA/cm2 was observed for the MoS2/CoTe (1:1) heterojunction which is about 11 times higher than the pristine MoS2. This current density was obtained at an applied bias of 0.62 V vs. Ag/AgCl (1.23 V vs. RHE) under the light intensity of 100 mW/cm2 of AM 1.5G illumination. The enhanced photocurrent density may be attributed to the efficient electron–hole pair separation. The solar to hydrogen conversion efficiency was found to be 0.84% for 1:1 MoS2/CoTe, signifying the efficient formation of the p-n junction. This study offers a novel heterojunction photocatalyst, for PEC water splitting.

Distinguishing surface effects of gold nanoparticles from plasmonic effect on photoelectrochemical water splitting by hematite

2016 ◽  
Vol 31 (11) ◽  
pp. 1608-1615 ◽  
Author(s):  
Jiangtian Li ◽  
Scott K. Cushing ◽  
Deryn Chu ◽  
Peng Zheng ◽  
Joeseph Bright ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Water Splitting ◽  
Surface Effects ◽  
Photoelectrochemical Water Splitting ◽  
Plasmonic Effect ◽  
Image Position

Abstract

Surface-reduced Si-doped TiO2 nanotubes for high-efficiency photoelectrochemical water splitting

2019 ◽  
Vol 12 (06) ◽  
pp. 1940004
Author(s):  
Dawei Si ◽  
Zhenbiao Dong ◽  
Ting Li ◽  
Dongyan Ding ◽  
Congqin Ning
Keyword(s):  
Water Splitting ◽  
High Efficiency ◽  
Photocurrent Density ◽  
Reduction Reaction ◽  
Photoelectrochemical Water Splitting ◽  
Defect States ◽  
Photogenerated Electrons ◽  
Long Time ◽  
Si Doped

TiO2 is a promising photocatalyst in the reaction of water splitting for hydrogen. Here, we used NaBH4 reduction reaction to introduce [Formula: see text]/VO defect states into Si-doped TiO2 nanotubes and investigated the photoelectrochemical water splitting properties. It was found that the photocatalytic activity was improved through NaBH4 reduction because of the existence of [Formula: see text]/VO. The defect states ([Formula: see text]/VO) could play a role of capture trap and accelerate the separation of photogenerated electrons and holes. The photocurrent density of the Si-doped TiO2 nanotubes reduced for 3[Formula: see text]h was 1.5[Formula: see text]mA/cm2 compared to 0.7[Formula: see text]mA/cm2 of the unreduced nanotubes. The conversion efficiency was 0.7%, which was almost 4 times than that of pure TiO2. On the other hand, reduction for a long time would generate excess defect states and thus cause the decrease of photocurrent density. Excess defect states could act as the recombination centers of photogenerated electrons and holes.

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