Boosting the performance of TiO2 nanotubes with ecofriendly AgIn5Se8 quantum dots for photoelectrochemical hydrogen generation

Velásquez, Danilo A.P.; Sousa, Felipe L.N.; Soares, Thiago André Salgueiro; Caires, Anderson J.; Freitas, Denilson V.; Navarro, Marcelo; Machado, Giovanna

doi:10.1016/j.jpowsour.2021.230165

Cited by 20 publications

(12 citation statements)

References 78 publications

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“…19 Applications of AISe NCs have started to emerge as well, including demonstrations of biomedical optical imaging, 13,14,16 light harvesting, 9,17 and hydrogen generation. 20 On the basis of such reports, interest in AISe NCs for photonics and other applications has been revived. However, their application potential is dependent upon a thorough understanding of their optoelectronic properties.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Successful fabrication methodologies of robust AISe nanomaterials date back as early as 2006, followed by further progress that includes development of modular hot injection synthesis, ligand control of the precursor reactivity, amide-promoted synthetic routes, , thermolysis-based NC growth, stochiometric control of the crystal structure, demonstration of Zn-AISe , and AISe-S alloys and core–shell ZnS/ZnSe-AISe NCs, ,, ligand-mediated control of the NC crystal phase, and direct aqueous synthesis of ultrasmall NCs . Applications of AISe NCs have started to emerge as well, including demonstrations of biomedical optical imaging, ,, light harvesting, , and hydrogen generation . On the basis of such reports, interest in AISe NCs for photonics and other applications has been revived.…”

Section: Introductionmentioning

confidence: 99%

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Optical Transitions in Silver Indium Selenide Nanocrystals: Implications for Light-Emitting and Light-Imaging Applications

Zacharia

Papagiorgis

Yarema

et al. 2021

ACS Appl. Nano Mater.

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Among the alternatives for the successful family of Cd-and Pb-chalcogenide nanocrystals (NCs), I−III−VI NCs appear to be highly promising as they combine low toxicity with up-and-coming light-emitting and light-imaging applications. Much of the focus has been placed on the prototype Cu−In−S NC system, while Ag-based NCs are significantly less developed. Herein we report spectroscopic studies of robust Ag 3 In 5 Se 9 NCs fabricated via an amide-promoted synthesis, using NC size as the structural varying parameter. Temperature-dependent photoluminescence, combined with Gaussian line-shape analysis, reveals the presence of three radiative channels in colloids and films of the Ag 3 In 5 Se 9 NCs. On the basis of their energetics, dynamics, and size-and temperature-dependent behavior, we assign the radiative channels to optical transitions from the conduction-band minimum to (i) in-gap states of self-trapped holes, (ii) valence-band maximum, and (iii) lower-energy valence-band states. Furthermore, by combining pump−probe experiments with tight-binding band-structure calculations whose parameters were derived from first principles, we reveal the presence of two main interband absorption transitions associated with NC electronic states. The dynamics of such transitions are influenced by shallow surface states that act as sites in which fast exciton trapping and much slower detrapping occurs, whereas the trapping and detrapping rates are gauged by confinement and temperature.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical Transitions in Silver Indium Selenide Nanocrystals: Implications for Light-Emitting and Light-Imaging Applications

Zacharia

Papagiorgis

Yarema

et al. 2021

ACS Appl. Nano Mater.

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“…In each case, authors achieve, respectively, photocurrent values above 7 mAcm −2 (7% efficiency) and 10 mAcm −2 (12.82% efficiency). Currently stand out layered selenophosphites photocatalysts and improved Ag‐sensitized TiO 2 119‐125 . Photoelectrocatalysis report typical photoanodes of BiVO 4 and Ta 3 N 5 , with still low efficiency, and real pilot implementations with a short‐term 100 kg/day H 2 production 126‐128 …”

Section: Sun Heat and Electricity For Water Splitting‐based Hydrogen ...mentioning

confidence: 99%

“…Currently stand out layered selenophosphites photocatalysts and improved Ag-sensitized TiO 2 . [119][120][121][122][123][124][125] Photoelectrocatalysis report typical photoanodes of BiVO 4 and Ta 3 N 5 , with still low efficiency, and real pilot implementations with a short-term 100 kg/day H 2 production. [126][127][128]…”

Section: Photoelectrochemical Cells Based On Semiconductorsmentioning

confidence: 99%

Sun, heat and electricity. A comprehensive study of non‐pollutant alternatives to produce green hydrogen

Mancera

Segura

Andújar

et al. 2022

Intl J of Energy Research

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Summary Water‐based hydrogen production is currently an attractive research field, as it provides a greener method to produce hydrogen than existing alternatives. Green hydrogen is expected to progressively replace fossil fuels, which are highly harmful environmentally. This paper presents a critical analysis over time of the main water splitting technologies currently in use for sustainable hydrogen production. As a result of the critical analysis, all the studied techniques have been ordered chronologically in the way that it is possible to understand how new materials have driven to new techniques, more efficient and less expensive. This allows having a complete vision of these technologies. A high level of maturity has been reached in electrolysis, while other techniques still have a long way to go, although many improvements and relevant advancements have been made over the years. The paper offers a global and comparative vision of each technology. From this, it is possible to identify the different paths where efforts are needed to make water‐based hydrogen production a mature, stable and efficient technology.

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“…AgIn 5 Se 8 (AIS) is a typical n-type ternary layered material with a direct band gap of about 1.25 eV, which has a high absorption coefficient under visible light. , Meanwhile, AIS also exhibits excellent light stability and high optical conductivity, − indicating that AIS is a potential active material for optoelectronic devices. Furthermore, the existence of silver usually results in high sensitivity to light and thermal stress, which is helpful for photoelectric and thermoelectric applications. − However, although there are several pioneering works predicting the application of AIS in optoelectronics, the research on AIS-based photodetectors is still limited.…”

Section: Introductionmentioning

confidence: 99%

Fast Response Self-Powered UV–Vis–NIR Broadband Photodetector Based on a Type II Heterojunction of AgIn₅Se₈/FePSe₃

Ren

et al. 2022

ACS Appl. Electron. Mater.

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Ternary layered materials with small band gaps are prospective candidates for future UV–Vis–NIR broadband photodetectors, which show multiple degrees of freedom for tailoring their optoelectrical properties. AgIn5Se8 (AIS), with a direct bandgap (around 1.25 eV) and n-type conductivity, has great application potential in UV–Vis–NIR broadband optoelectronics due to its excellent light stability and high optical conductivity. However, research on AIS-based self-powered photodetectors with a broad spectrum and fast response speed is still rare. In this work, we report a self-powered photodetector based on a AgIn5Se8/FePSe3 (FPS) n–p heterojunction with a spectral detection range of 365–1020 nm. Benefiting from the built-in field, the type II heterojunction can suppress dark current and promote the rapid separation of electron–hole pairs. As a result, the fabricated photodetector exhibits a low dark current of 1 pA and a fast response time (τr/τd) of less than 20/20 ms. The results indicate that an AIS/FPS heterojunction proves to be an excellent candidate for broad spectrum, fast response, and self-powered photoelectronic devices.

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Boosting the performance of TiO2 nanotubes with ecofriendly AgIn5Se8 quantum dots for photoelectrochemical hydrogen generation

Cited by 20 publications

References 78 publications

Optical Transitions in Silver Indium Selenide Nanocrystals: Implications for Light-Emitting and Light-Imaging Applications

Optical Transitions in Silver Indium Selenide Nanocrystals: Implications for Light-Emitting and Light-Imaging Applications

Sun, heat and electricity. A comprehensive study of non‐pollutant alternatives to produce green hydrogen

Fast Response Self-Powered UV–Vis–NIR Broadband Photodetector Based on a Type II Heterojunction of AgIn₅Se₈/FePSe₃

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Boosting the performance of TiO2 nanotubes with ecofriendly AgIn5Se8 quantum dots for photoelectrochemical hydrogen generation

Cited by 20 publications

References 78 publications

Optical Transitions in Silver Indium Selenide Nanocrystals: Implications for Light-Emitting and Light-Imaging Applications

Optical Transitions in Silver Indium Selenide Nanocrystals: Implications for Light-Emitting and Light-Imaging Applications

Sun, heat and electricity. A comprehensive study of non‐pollutant alternatives to produce green hydrogen

Fast Response Self-Powered UV–Vis–NIR Broadband Photodetector Based on a Type II Heterojunction of AgIn5Se8/FePSe3

Contact Info

Product

Resources

About

Fast Response Self-Powered UV–Vis–NIR Broadband Photodetector Based on a Type II Heterojunction of AgIn₅Se₈/FePSe₃