Yolk-shell nanostructures as an emerging photocatalyst paradigm for solar hydrogen generation

Chiu, Yi Hsuan; Naghadeh, Sara Bonabi; Lindley, Sarah A.; Lai, Ting-Hsuan; Kuo, Ming Yu; Chang, Kao Der; Zhang, Jin Z.; Hsu, Yen‐Chu

doi:10.1016/j.nanoen.2019.05.008

Cited by 89 publications

(69 citation statements)

References 61 publications

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“…As discussed above, the general process to synthesize the single‐core/single‐shell YS nanostructure could be divided into three stages; first, an anion exchange reaction during the sulfidation process wherein the S 2− ions react with metal ions in the preformed precursors; second, the occurrence of Kirkendall effect process wherein an outward diffusion of metal ions and inward diffusion of S 2− create a thin metal sulfide shell layer with a defined gap from the core precursor; and lastly, the formation of second shell at the surface of the core since the metal ions could no longer reach the initial metal sulfide shell layer due to the presence of a wide gap between the remaining core and first shell. In addition, the number of shells could be controlled by adjusting the anion exchange reaction time and the initial particle size of the precursors …”

Section: Synthesis Of Hollow Structured Metal Sulfidesmentioning

confidence: 99%

Hollow Structured Metal Sulfides for Photocatalytic Hydrogen Generation

et al. 2020

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Metal sulfides (MSs) are a promising class of materials for photocatalytic hydrogen generation due to their distinct features of photosensitivity, electrical conductance, and photoelectrochemical stability. However, the photocatalytic activity of solid structured MSs is often compromised due to low incident photon absorption, high charge carrier recombination, inadequate catalytic active sites, and slow mass and charge diffusion. The development of hollow structured MSs alleviates these limitations and achieves higher H2 generation than solid structured counterparts. This minireview aims to review the recent advances in the development of synthetic methods for various hollow structured MSs that are designed to enhance light absorption and fasten mass diffusion. Particularly, this report highlights the advent of sophisticated heterostructured hollow MSs for the application in photocatalysis, in which the formation of heterojunction at the semiconductor interface ensures spatial separation of charge carriers. The synergy between the hollow structure and heterostructure dramatically increases the H2 generation rate by providing increased light absorption, delayed charge recombination, and accelerated mass diffusion. We also point to potentially fruitful research directions in this field, in hope that this minireview serves as a stepping stone for the future development in hollow MSs for photocatalytic applications and beyond.

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Section: Synthesis Of Hollow Structured Metal Sulfidesmentioning

confidence: 99%

Hollow Structured Metal Sulfides for Photocatalytic Hydrogen Generation

et al. 2020

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“…Although one of the most successful semiconductors—for plasmonic PEC‐WS—is titanium dioxide (TiO 2 ), mainly owing to its chemical stability, earth abundance, and cost effectiveness; however, it suffers from a poor absorption response that only covers the ultraviolet (UV) portion of the solar spectrum. Therefore, in recent years, extensive attempts have been made for the design and realization of plasmonic coupled low band gap metal oxides for driving water oxidation and reduction reactions . By decorating plasmonic deep sub‐wavelength nanoparticles on a semiconductor, near field effects and hot electron injection can simultaneously contribute to the overall activity of the cell.…”

Section: Introductionmentioning

confidence: 99%

Strong Light–Matter Interactions in Au Plasmonic Nanoantennas Coupled with Prussian Blue Catalyst on BiVO₄ for Photoelectrochemical Water Splitting

Ghobadi

Soydan

et al. 2020

ChemSusChem

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A facial and large‐scale compatible fabrication route is established, affording a high‐performance heterogeneous plasmonic‐based photoelectrode for water oxidation that incorporates a CoFe–Prussian blue analog (PBA) structure as the water oxidation catalytic center. For this purpose, an angled deposition of gold (Au) was used to selectively coat the tips of the bismuth vanadate (BiVO4) nanostructures, yielding Au‐capped BiVO4 (Au‐BiVO4). The formation of multiple size/dimension Au capping islands provides strong light–matter interactions at nanoscale dimensions. These plasmonic particles not only enhance light absorption in the bulk BiVO4 (through the excitation of Fabry–Perot (FP) modes) but also contribute to photocurrent generation through the injection of sub‐band‐gap hot electrons. To substantiate the activity of the photoanodes, the interfacial electron dynamics are significantly improved by using a PBA water oxidation catalyst (WOC) resulting in an Au‐BiVO4/PBA assembly. At 1.23 V (vs. RHE), the photocurrent value for a bare BiVO4 photoanode was obtained as 190 μA cm−2, whereas it was boosted to 295 μA cm−2 and 1800 μA cm−2 for Au‐BiVO4 and Au‐BiVO4/PBA, respectively. Our results suggest that this simple and facial synthetic approach paves the way for plasmonic‐based solar water splitting, in which a variety of common metals and semiconductors can be employed in conjunction with catalyst designs.

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“…Production of H 2 attracts attention because it is essential for fuel and chemicalr eactions. To obtain H 2 from water utilizing light energy,m any semiconductor photocatalysts have been proposed [1][2][3][4][5] since the discovery of the Honda and Fujishima effect. [6] There are mainly three core challenges for utilizing semiconductor photocatalyst to produce H 2 .T he first problem is about band structure tuning.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production System by Light‐Induced α‐FeOOH Coupled with Photoreduction

Yamada

Suzuki

Nakata

et al. 2020

Chemistry A European J

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Solar‐driven catalysts on semiconductors to produce hydrogen are considered as a means to solve environmental issues. In this study, H2 production coupling with oxygen consumption by noble metal‐free α‐FeOOH was demonstrated even though the conduction band edge was lower than the reduction potential of H+ to H2. For activation of α‐FeOOH, an electron donor, Hg‐Xe irradiation, and low pH (ca. 5) were indispensable factors. The H2 production from H2O was confirmed by GC‐MS using isotope‐labeled water (D2O) and deuterated methanol. The α‐FeOOH synthesized by coprecipitation method showed 25 times more active than TiO2. The photocatalytic activity was stable for over 400 h. Our study suggests that α‐FeOOH known as rust can produce H2 by light induction.

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Yolk-shell nanostructures as an emerging photocatalyst paradigm for solar hydrogen generation

Cited by 89 publications

References 61 publications

Hollow Structured Metal Sulfides for Photocatalytic Hydrogen Generation

Hollow Structured Metal Sulfides for Photocatalytic Hydrogen Generation

Strong Light–Matter Interactions in Au Plasmonic Nanoantennas Coupled with Prussian Blue Catalyst on BiVO₄ for Photoelectrochemical Water Splitting

Hydrogen Production System by Light‐Induced α‐FeOOH Coupled with Photoreduction

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Yolk-shell nanostructures as an emerging photocatalyst paradigm for solar hydrogen generation

Cited by 89 publications

References 61 publications

Hollow Structured Metal Sulfides for Photocatalytic Hydrogen Generation

Hollow Structured Metal Sulfides for Photocatalytic Hydrogen Generation

Strong Light–Matter Interactions in Au Plasmonic Nanoantennas Coupled with Prussian Blue Catalyst on BiVO4 for Photoelectrochemical Water Splitting

Hydrogen Production System by Light‐Induced α‐FeOOH Coupled with Photoreduction

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Strong Light–Matter Interactions in Au Plasmonic Nanoantennas Coupled with Prussian Blue Catalyst on BiVO₄ for Photoelectrochemical Water Splitting