Group III-nitride nanowire structures for photocatalytic hydrogen evolution under visible light irradiation

Chowdhury, Faqrul A.; Mi, Zetian; Kibria, Golam; Trudeau, Michel

doi:10.1063/1.4923258

Cited by 46 publications

(28 citation statements)

References 44 publications

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“…[103,104] GaN-based alloys and nanostructures exhibit near-ideal thermodynamic and kinetic attributes and advantages [105] over other known photocatalysts, including extreme chemical stability, high absorption coefficients and tunable bandgap to encompass nearly entire solar spectrum (shown in Figure 10) while straddling water redox potential for up to %50% indium incorporation. [10,106] Moreover, the nonpolar surfaces of GaN are highly reactive for spontaneous dissociation of water molecules, [107,108] and possess low energy barrier for proton diffusion. [109,110] GaN-based nanocrystals provide additional advantages, including significantly reduced defects and dislocations when grown on foreign substrates, efficient light absorption and charge carrier separation, and enhanced stability due to the N-rich surfaces that can protect against photo-corrosion and oxidation.…”

Section: Artificial Photosynthesismentioning

confidence: 99%

Emerging Applications of III‐Nitride Nanocrystals

Liu

Chowdhury

Vanka

et al. 2020

Physica Status Solidi (a)

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Recently, significant progress has been made in III-nitride nanocrystals. They exhibit unique structural, electronic, optical, and photocatalytic properties, and have emerged as a functional platform to realize high-performance optoelectronic, electronic, quantum, and solar energy devices. Compared with conventional III-nitride epilayers and quantum wells, dislocation-free III-nitride nanocrystals can, in principle, be achieved on lattice mismatched foreign substrates due to the efficient surface strain relaxation. In this Feature Article, the authors discuss the epitaxy, characteristics, and some emerging device applications of III-nitride nanocrystals grown by plasma-assisted molecular beam epitaxy.

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Section: Artificial Photosynthesismentioning

confidence: 99%

Emerging Applications of III‐Nitride Nanocrystals

Liu

Chowdhury

Vanka

et al. 2020

Physica Status Solidi (a)

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“…The growth conditions were optimized after several iterations for better crystalline quality and photocatalytic performance in overall water splitting reaction. Instead of multi-stack InGaN:Mg/GaN:Mg layers 35 , 36 , a continuous InGaN:Mg layer was grown spontaneously on top of GaN:Ge nanowire template followed by a final GaN:Mg capping layer (relatively smaller than InGaN in length, in proportion to fraction of UV region in the spectrum). A nitrogen flow rate of 1.0 standard cubic centimeters per minute (sccm), and a forward plasma power of ~350 W were used during the growth.…”

Section: Methodsmentioning

confidence: 99%

A photochemical diode artificial photosynthesis system for unassisted high efficiency overall pure water splitting

Chowdhury¹,

Trudeau²,

Guo³

et al. 2018

Nat Commun

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147

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The conversion of solar energy into chemical fuels can potentially address many of the energy and environment related challenges we face today. In this study, we have demonstrated a photochemical diode artificial photosynthesis system that can enable efficient, unassisted overall pure water splitting without using any sacrificial reagent. By precisely controlling charge carrier flow at the nanoscale, the wafer-level photochemical diode arrays exhibited solar-to-hydrogen efficiency ~3.3% in neutral (pH ~ 7.0) overall water splitting reaction. In part of the visible spectrum (400–485 nm), the energy conversion efficiency and apparent quantum yield reaches ~8.75% and ~20%, respectively, which are the highest values ever reported for one-step visible-light driven photocatalytic overall pure water splitting. The effective manipulation and control of charge carrier flow in nanostructured photocatalysts provides critical insight in achieving high efficiency artificial photosynthesis, including the efficient and selective reduction of CO2 to hydrocarbon fuels.

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“…To improve the carrier extraction process, researchers have observed that controlling the band bending process in nanostructured In x Ga 1 − x N photo-electrode design and optimizing it is of utmost importance. Such a design has shown a considerable absorption improvement in the PEC process as compared to undoped samples, especially in UV and violet spectrum region [75]. In another study, Alvi et al achieved In incorporation beyond 40% in the design of nanostructured In x Ga 1 − x N using PAMBE method and achieved notable enhancement in photocatalytic activity [76].…”

Section: Light Management For Photoelectrochemical Cells Using Periodmentioning

confidence: 99%

Periodic Nanophotonic Structures-Based Light Management for Solar Energy Harvesting

Gupta¹

2021

Optoelectronics

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Solar energy has always been an obvious choice for solving the energy issues for the humans for centuries. The two most popular choices, out of many, to harness this infinite source of energy are: solar cells and photoelectrochemical cells. Although both these techniques are quite attractive, they have inherent limitations for tapping all of the incident photons. Maximizing the absorption of incident photons to produce maximum possible electrical output is always the main impetus for the researchers working to streamline these two techniques and making them compatible with existing sources of electrical energy. It has been well established that the light trapping in the solar cells and photoelectrochemical cells can play a vital role in improving their performance. To design light harvesting structures for both these applications, periodic nanophotonic structures have demonstrated stupendous results and shown that they have the real potential to enhance their performance. The chapter, in this regard, presents and reviews the current and historical aspects of the light harvesting structures for these two interesting applications and also discusses about the future of the research to further the performance of these large-area solar-to-electrical conversion transducers.

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Group III-nitride nanowire structures for photocatalytic hydrogen evolution under visible light irradiation

Cited by 46 publications

References 44 publications

Emerging Applications of III‐Nitride Nanocrystals

Emerging Applications of III‐Nitride Nanocrystals

A photochemical diode artificial photosynthesis system for unassisted high efficiency overall pure water splitting

Periodic Nanophotonic Structures-Based Light Management for Solar Energy Harvesting

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