Sequentially surface modified hematite enables lower applied bias photoelectrochemical water splitting

2017 ◽  
Vol 19 (31) ◽  
pp. 20881-20890 ◽  
Author(s):  
Andebet Gedamu Tamirat ◽  
Amare Aregahegn Dubale ◽  
Wei-Nien Su ◽  
Hung-Ming Chen ◽  
Bing-Joe Hwang
Keyword(s):  
Water Splitting ◽  
Surface Passivation ◽  
Surface Treatments ◽  
Passivation Layer ◽  
Photoelectrochemical Water Splitting ◽  
Applied Bias ◽  
Onset Potential ◽  
Heavily Doped ◽  
Surface Modified

We achieve a low onset potential of 0.49 V using heavily doped Fe2−xSnxO3surface passivation layer and NiOOH dual surface treatments.

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 Activating the surface and bulk of hematite photoanodes to improve solar water splitting

2019 ◽  
Vol 10 (44) ◽  
pp. 10436-10444 ◽  
Author(s):  
Hemin Zhang ◽  
Jong Hyun Park ◽  
Woo Jin Byun ◽  
Myoung Hoon Song ◽  
Jae Sung Lee
Keyword(s):  
Water Splitting ◽  
Oxygen Vacancies ◽  
Surface Passivation ◽  
Photoelectrochemical Water Splitting ◽  
Electrochemical Activation ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Waking Up

Waking up the hematite lion: a simple electrochemical activation treatment leads to surface passivation outside and generation of oxygen vacancies inside, which greatly enhances photoelectrochemical water splitting.

scholarly journals A significant cathodic shift in the onset potential of photoelectrochemical water splitting for hematite nanostructures grown from Fe–Si alloys

2014 ◽  
Vol 1 (3) ◽  
pp. 344-347 ◽  
Author(s):  
Lei Wang ◽  
Chong-Yong Lee ◽  
Robin Kirchgeorg ◽  
Helga Hildebrand ◽  
Julian Müller ◽  
...  
Keyword(s):  
Thermal Oxidation ◽  
Water Splitting ◽  
Photoelectrochemical Water Splitting ◽  
Onset Potential

Thermal oxidation of Fe to nanostructured hematite (wires, flakes) is currently widely investigated to produce efficient photoanodes for photoelectrochemical water splitting.

Mg–Zr Cosubstituted Ta3N5 Photoanode for Lower-Onset-Potential Solar-Driven Photoelectrochemical Water Splitting

2015 ◽  
Vol 137 (40) ◽  
pp. 12780-12783 ◽  
Author(s):  
Jeongsuk Seo ◽  
Tsuyoshi Takata ◽  
Mamiko Nakabayashi ◽  
Takashi Hisatomi ◽  
Naoya Shibata ◽  
...  
Keyword(s):  
Water Splitting ◽  
Photoelectrochemical Water Splitting ◽  
Onset Potential

scholarly journals A nanostructured NiO/cubic SiC p–n heterojunction photoanode for enhanced solar water splitting

2019 ◽  
Vol 7 (9) ◽  
pp. 4721-4728 ◽  
Author(s):  
Jingxin Jian ◽  
Yuchen Shi ◽  
Sebastian Ekeroth ◽  
Julien Keraudy ◽  
Mikael Syväjärvi ◽  
...  
Keyword(s):  
Water Splitting ◽  
Fill Factor ◽  
Photoelectrochemical Water Splitting ◽  
Onset Potential ◽  
Solar Water ◽  
Solar Water Splitting

A 3C-SiC/NiO p–n heterojunction photoanode exhibits a substantially improved photoelectrochemical water-splitting performance in terms of photocurrent, onset potential and fill-factor.

scholarly journals Photoelectrochemical water-splitting over a surface modified p-type Cr2O3 photocathode

2020 ◽  
Vol 49 (3) ◽  
pp. 659-666 ◽  
Author(s):  
Keita Sekizawa ◽  
Keiichiro Oh-ishi ◽  
Takeshi Morikawa
Keyword(s):  
Surface Modification ◽  
Water Splitting ◽  
Photoelectrochemical Water Splitting ◽  
Surface Modified ◽  
P Type

H2 generation via solar photoelectrochemical water-splitting by Cr2O3 was successfully realized by surface modification with TiO2 and the following Pt deposition.

Characteristics of crystalline sputtered LaFeO3 thin films as photoelectrochemical water splitting photocathodes

Nanoscale ◽  
2020 ◽  
Vol 12 (17) ◽  
pp. 9653-9660 ◽  
Author(s):  
Min-Kyu Son ◽  
Hyunwoong Seo ◽  
Motonori Watanabe ◽  
Masaharu Shiratani ◽  
Tatsumi Ishihara
Keyword(s):  
Thin Films ◽  
Water Splitting ◽  
Early Onset ◽  
Photoelectrochemical Water Splitting ◽  
Onset Potential

A transparent crystalline sputtered LaFeO3 photocathode with an early onset potential for stable photoelectrochemical water splitting.

scholarly journals Surface Modification of Hematite Photoanodes for Improvement of Photoelectrochemical Performance

Catalysts ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 497 ◽  
Author(s):  
Lifei Xi ◽  
Kathrin Lange
Keyword(s):  
Surface Modification ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Surface Passivation ◽  
Earth Metal ◽  
Photoelectrochemical Performance ◽  
Onset Potential ◽  
Solar Water Splitting

Solar water splitting is a promising method for producing renewable fuels. Thermodynamically, the overall water splitting reaction is an uphill reaction involving a multiple electron transfer process. The oxygen evolution reaction (OER) has been identified as the bottleneck process. Hematite (α-Fe2O3) is one of the best photoanode material candidates due to its band gap properties and stability in aqueous solution. However, the reported efficiencies of hematite are notoriously lower than the theoretically predicted value mainly due to poor charge transfer and separation ability, short hole diffusion length as well as slow water oxidation kinetics. In this Review Article, several emerging surface modification strategies to reduce the oxygen evolution overpotential and thus to enhance the water oxidation reaction kinetics will be presented. These strategies include co-catalysts loading, photoabsorption enhancing (surface plasmonic metal and rare earth metal decoration), surface passivation layer deposition, surface chemical etching and surface doping. These methods are found to reduce charge recombination happening at surface trapping states, promote charge separation and diffusion, and accelerate water oxidation kinetics. The detailed surface modification methods, surface layer materials, the photoelectrochemical (PEC) performances including photocurrent and onset potential shift as well as the related proposed mechanisms will be reviewed.

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