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143 results on '"Pihosh, Yuriy"'

6. The sputter-based synthesis of tantalum oxynitride nanoparticles with architecture and bandgap controlled by design

Author

Pleskunov, Pavel, Košutová, Tereza, Vaidulych, Mykhailo, Nikitin, Daniil, Krtouš, Zdeněk, Ali-Ogly, Suren, Kishenina, Ksenia, Tafiichuk, Renata, Biederman, Hynek, Gordeev, Ivan, Drewes, Jonas, Barg, Igor, Faupel, Franz, Cieslar, Miroslav, Yatskiv, Roman, Pihosh, Yuriy, Nandal, Vikas, Seki, Kazuhiko, Domen, Kazunari, and Choukourov, Andrei

Published
2021
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9. Tantalum Nitride‐Enabled Solar Water Splitting with Efficiency Above 10%

Author

Pihosh, Yuriy, primary, Nandal, Vikas, additional, Higashi, Tomohiro, additional, Shoji, Ryota, additional, Bekarevich, Raman, additional, Nishiyama, Hiroshi, additional, Yamada, Taro, additional, Nicolosi, Valeria, additional, Hisatomi, Takashi, additional, Matsuzaki, Hiroyuki, additional, Seki, Kazuhiko, additional, and Domen, Kazunari, additional

Published
2023
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11. Simple Immersing Method of Nanocoating on Uneven Surfaces Applicable to Highly Durable Ta3N5Nanorod Photoelectrode for Water Splitting

Author

Kawase, Yudai, Higashi, Tomohiro, Obata, Keisuke, Kishimoto, Fuminao, Pihosh, Yuriy, Domen, Kazunari, and Takanabe, Kazuhiro

Abstract

Uniform nanolayer coatings on photoelectrodes for water splitting are effective in improving their durability by isolating the semiconductor from direct contact with liquid electrolytes. Achieving a thin and uniform coating across the entire surface of nanostructured uneven photoelectrodes using wet processes remains a challenge. This study provides a strategy for the spontaneous formation of a uniform nanolayer of NiFeOxelectrocatalyst on Ta3N5nanorods (NRs) photoelectrodes mediated by acetonitrile (CH3CN) solvent and bulky metal ethylhexanoate complexes. Following the NiFeOxdeposition through a spin-coating method on Ta3N5NRs, the sample is immersed in CH3CN solvent for 12 h. This treatment effectively results in complete coverage of the complex structured surface of Ta3N5NRs by the NiFeOxnanolayer. The nanocoating ensures the protection of Ta3N5NRs and contributes to enhanced durability. This distinctive surface modification is applied to semitransparent Ta3N5NRs photoanodes which is applicable to photovoltaic–photoelectrochemical tandem cells. This simple immersion method of bulky metal complexes into a thin and uniform layer on rough surfaces would have potential for various applications including (photo)electrochemical reactions and corrosion inhibitions.

Published
2024
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12. Efficient and stable visible-light-driven Z-scheme overall water splitting using an oxysulfide H2 evolution photocatalyst.

Author

Lin, Lihua, Ma, Yiwen, Vequizo, Junie Jhon M., Nakabayashi, Mamiko, Gu, Chen, Tao, Xiaoping, Yoshida, Hiroaki, Pihosh, Yuriy, Nishina, Yuta, Yamakata, Akira, Shibata, Naoya, Hisatomi, Takashi, Takata, Tsuyoshi, and Domen, Kazunari

Abstract

So-called Z-scheme systems permit overall water splitting using narrow-bandgap photocatalysts. To boost the performance of such systems, it is necessary to enhance the intrinsic activities of the hydrogen evolution photocatalyst and oxygen evolution photocatalyst, promote electron transfer from the oxygen evolution photocatalyst to the hydrogen evolution photocatalyst, and suppress back reactions. The present work develop a high-performance oxysulfide photocatalyst, Sm2Ti2O5S2, as an hydrogen evolution photocatalyst for use in a Z-scheme overall water splitting system in combination with BiVO4 as the oxygen evolution photocatalyst and reduced graphene oxide as the solid-state electron mediator. After surface modifications of the photocatalysts to promote charge separation and redox reactions, this system is able to split water into hydrogen and oxygen for more than 100 hours with a solar-to-hydrogen energy conversion efficiency of 0.22%. In contrast to many existing photocatalytic systems, the water splitting activity of the present system is only minimally reduced by increasing the background pressure to 90 kPa. These results suggest characteristics suitable for applications under practical operating conditions.Photocatalytic water splitting systems using Sm2Ti2O5S2, a visible light-active oxysulfide, exhibited low efficiencies due to low intrinsic photoactivity and rapid back reaction. Here, the efficiency was greatly improved by refining the preparation of photocatalysts and electron mediators [ABSTRACT FROM AUTHOR]

Published
2024
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17. Physicochemical insights into semiconductor properties of a semitransparent tantalum nitride photoanode for solar water splitting.

Author

Higashi, Tomohiro, Nishiyama, Hiroshi, Pihosh, Yuriy, Wakishima, Kaisei, Kawase, Yudai, Sasaki, Yutaka, Nagaoka, Akira, Yoshino, Kenji, Takanabe, Kazuhiro, and Domen, Kazunari

Abstract

The self-conductivity of tantalum nitride (Ta3N5) thin film-based semitransparent photoanodes was found to promote the current originating from the photoelectrochemical oxygen evolution reaction (PEC OER) without a conducting substrate. With surface modification by the NiFeOx-electrocatalyst, an optimized Ta3N5 thin film fabricated directly on a transparent insulating quartz substrate generated a photocurrent density of ∼5.9 ± 0.1 mA cm−2 at 1.23 V vs. the reversible hydrogen electrode under simulated AM 1.5G solar illumination. The correlation between the PEC OER performance of NiFeOx-modified Ta3N5 photoanodes and the electrical properties of Ta3N5 thin films was investigated based on the Hall effect measurements. By changing the nitridation conditions, these properties can be tuned so that the higher the Hall mobility (0.2 to 1.7 cm2 V−1 s−1) and the lower the carrier concentration (1020 to 1019 cm−3). The surface chemical states of Ta3N5 thin films were investigated using X-ray photoelectron spectroscopy as a means of evaluating surface oxygen impurities and nitrogen vacancies, which may correlate with the PEC OER performance and the electrical properties of the material. [ABSTRACT FROM AUTHOR]

Published
2023
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18. Mechanistic Insights into Enhanced Hydrogen Evolution of CrOx/Rh Nanoparticles for Photocatalytic Water Splitting.

Author

Higashi, Tomohiro, Seki, Kazuhiko, Sasaki, Yutaka, Pihosh, Yuriy, Nandal, Vikas, Nakabayashi, Mamiko, Shibata, Naoya, and Domen, Kazunari

Subjects
CHARGE exchange, HYDROGEN evolution reactions, HYDROGEN, NANOPARTICLES, TIN oxides
Abstract

The hydrogen evolution reaction (HER) of Rh nanoparticles (RhNP) coated with an ultrathin layer of Cr‐oxides (CrOx) was investigated as a model electrode for the Cr2O3/Rh‐metal core‐shell‐type cocatalyst system for photocatalytic water splitting. The CrOx layer was electrodeposited over RhNP on a transparent conductive fluorine‐doped tin oxide (FTO) substrate. The CrOx layer on RhNP facilitates the electron transfer process at the CrOx/RhNP interface, leading to the increased current density for the HER. Impedance spectroscopic analysis revealed that the CrOx layer transferred protons via the hopping mechanism to the RhNP surface for HER. In addition, CrOx restricted electron transfer from the FTO to the electrolyte and/or RhNP and suppressed the backward reaction by limiting oxygen migration. This study clarifies the crucial role of the ultrathin CrOx layer on nanoparticulate cocatalysts and provides a cocatalyst design strategy for realizing efficient photocatalytic water splitting. [ABSTRACT FROM AUTHOR]

Published
2023
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20. Design of semitransparent tantalum nitride photoanode for efficient and durable solar water splitting

Author

Higashi, Tomohiro, primary, Nishiyama, Hiroshi, additional, Nandal, Vikas, additional, Pihosh, Yuriy, additional, Kawase, Yudai, additional, Shoji, Ryota, additional, Nakabayashi, Mamiko, additional, Sasaki, Yutaka, additional, Shibata, Naoya, additional, Matsuzaki, Hiroyuki, additional, Seki, Kazuhiko, additional, Takanabe, Kazuhiro, additional, and Domen, Kazunari, additional

Published
2022
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28. Conversion Reaction in the Binder-Free Anode for Fast-Charging Li-Ion Batteries Based on WO3 Nanorods

Author

Bekarevich, Raman, primary, Pihosh, Yuriy, additional, Tanaka, Yoshinori, additional, Nishikawa, Kei, additional, Matsushita, Yoshitaka, additional, Hiroto, Takanobu, additional, Ohata, Hirohito, additional, Ohno, Takahisa, additional, Minegishi, Tsutomu, additional, Sugiyama, Masakazu, additional, Kitamori, Takehiko, additional, Mitsuishi, Kazutaka, additional, and Takada, Kazunori, additional

Published
2020
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30. Ta3N5-Nanorods enabling highly efficient water oxidation via advantageous light harvesting and charge collection

Author

Pihosh, Yuriy, primary, Minegishi, Tsutomu, additional, Nandal, Vikas, additional, Higashi, Tomohiro, additional, Katayama, Masao, additional, Yamada, Taro, additional, Sasaki, Yutaka, additional, Seki, Kazuhiko, additional, Suzuki, Yohichi, additional, Nakabayashi, Mamiko, additional, Sugiyama, Masakazu, additional, and Domen, Kazunari, additional

Published
2020
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37. Highly efficient photocatalytic conversion of solar energy to hydrogen by WO3/BiVO4 core–shell heterojunction nanorods

Author

Kosar, Sonya, primary, Pihosh, Yuriy, additional, Bekarevich, Raman, additional, Mitsuishi, Kazutaka, additional, Mawatari, Kazuma, additional, Kazoe, Yutaka, additional, Kitamori, Takehiko, additional, Tosa, Masahiro, additional, Tarasov, Alexey B., additional, Goodilin, Eugene A., additional, Struk, Yaroslav M., additional, Kondo, Michio, additional, and Turkevych, Ivan, additional

Published
2018
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41. Highly efficient photocatalytic conversion of solar energy to hydrogen by WO3/BiVO4 core–shell heterojunction nanorods.

Author

Kosar, Sonya, Pihosh, Yuriy, Bekarevich, Raman, Mitsuishi, Kazutaka, Mawatari, Kazuma, Kazoe, Yutaka, Kitamori, Takehiko, Tosa, Masahiro, Tarasov, Alexey B., Goodilin, Eugene A., Struk, Yaroslav M., Kondo, Michio, and Turkevych, Ivan

Subjects
HYDROGEN as fuel, ENERGY conversion, CHARGE carrier lifetime, HETEROJUNCTIONS, SOLAR cells, MAXIMUM power point trackers, SOLAR energy
Abstract

Photocatalytic splitting of water under solar light has proved itself to be a promising approach toward the utilization of solar energy and the generation of environmentally friendly fuel in a form of hydrogen. In this work, we demonstrate highly efficient solar-to-hydrogen conversion efficiency of 7.7% by photovoltaic–photoelectrochemical (PV–PEC) device based on hybrid MAPbI3 perovskite PV cell and WO3/BiVO4 core–shell nanorods PEC cell tandem that utilizes spectral splitting approach. Although BiVO4 is characterized by intrinsically high recombination rate of photogenerated carriers, this is not an issue for WO3/BiVO4 core–shell nanorods, where highly conductive WO3 cores are combined with extremely thin absorber BiVO4 shell layer. Since the BiVO4 layer is thinner than the characteristic carrier diffusion length, the photogenerated charge carriers are separated at the WO3/BiVO4 heterojunction before their recombination. Also, such architecture provides sufficient optical thickness even for extremely thin BiVO4 layer due to efficient light trapping in the core–shell WO3/BiVO4 nanorods with high aspect ratio. We also demonstrate that the concept of fill factor can be used to compare I–V characteristics of different photoanodes regarding their optimization for PV/PEC tandem devices. [ABSTRACT FROM AUTHOR]

Published
2019
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42. Understanding the Activation Mechanism of RhCrOxCocatalysts for Hydrogen Evolution with Nanoparticulate Electrodes

Author

Higashi, Tomohiro, Seki, Kazuhiko, Nandal, Vikas, Pihosh, Yuriy, Nakabayashi, Mamiko, Shibata, Naoya, and Domen, Kazunari

Abstract

Mixed oxides of Rh–Cr (RhCrOx), containing Rh3+and Cr3+cations, are commonly used as cocatalysts for the hydrogen evolution reaction (HER) on particulate photocatalysts. The precise physicochemical mechanisms of the HER at the catalytic sites of these oxides are not well understood. In this study, model cocatalyst electrodes, composed of nanoparticulate RhCrOx, were fabricated to investigate the physicochemical mechanisms of the HER. Electroanalytical and X-ray photoelectron spectroscopic measurements revealed that nanoparticulate RhCrOxproduces reduced Rh (Rh0) species by maintaining an electrode potential more negative than 0.03 V versus the reversible hydrogen electrode (VRHE). This results in significant enhancement of the HER activity. The catalytic activity for the HER stems from the reduced Rh species, and the inclusion of Cr3+(CrOx) aided in the electron transfer process at the solid/liquid interface, resulting in a higher current density during the HER. To achieve a solar-to-hydrogen efficiency of over 3%, the conduction band minimum of the particulate photocatalyst should be positioned more negatively than −0.10 VRHE. Moreover, the formation of electron trap states at potentials more positive than 0.03 VRHEshould be avoided. This study highlights the importance of understanding the catalytic sites on metal oxide cocatalysts. Moreover, it offers a design strategy for enhancing the efficiency of photocatalytic water splitting.

Published
2024
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44. Tandem photovoltaic–photoelectrochemical GaAs/InGaAsP–WO3/BiVO4 device for solar hydrogen generation

Author

Kosar, Sonya, primary, Pihosh, Yuriy, additional, Turkevych, Ivan, additional, Mawatari, Kazuma, additional, Uemura, Jin, additional, Kazoe, Yutaka, additional, Makita, Kikuo, additional, Sugaya, Takeyoshi, additional, Matsui, Takuya, additional, Fujita, Daisuke, additional, Tosa, Masahiro, additional, Struk, Yaroslav M., additional, Kondo, Michio, additional, and Kitamori, Takehiko, additional

Published
2016
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45. Photocatalytic generation of hydrogen by core-shell WO3/BiVO4 nanorods with ultimate water splitting efficiency

Author

Pihosh, Yuriy, primary, Turkevych, Ivan, additional, Mawatari, Kazuma, additional, Uemura, Jin, additional, Kazoe, Yutaka, additional, Kosar, Sonya, additional, Makita, Kikuo, additional, Sugaya, Takeyoshi, additional, Matsui, Takuya, additional, Fujita, Daisuke, additional, Tosa, Masahiro, additional, Kondo, Michio, additional, and Kitamori, Takehiko, additional

Published
2015
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