Photocatalytic Overall Water Splitting Promoted by an α–β phase Junction on Ga<sub>2</sub>O<sub>3</sub>

王翔,; 徐倩,; 李明润,; 沈帅,; 王秀丽,; 王耀川,; 冯兆池,; 施晶莹,; 韩洪宪,; 李灿,

doi:10.1002/ange.201207554

Cited by 149 publications

(100 citation statements)

References 30 publications

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“…With the α–β phase junctions of Ga 2 O 3 , the figures of merit reached three‐ and sevenfold higher than that of the individual α‐Ga 2 O 3 and β‐Ga 2 O 3 phases. Moreover, the photocatalytic activity of the α–β phase junction samples was much greater than that of mechanically mixed α‐Ga 2 O 3 and β‐Ga 2 O 3 samples, the latter of which had an activity almost equal to the summed individual activities of the α‐Ga 2 O 3 and β‐Ga 2 O 3 phases . Considering the microscopic analysis, it was demonstrated that neither the particle size nor surface area was believed to be the reason for achieving high photocatalytic activity, but rather the presence of the α–β phase junction.…”

Section: Spe For Energy Conversion and Environmental Treatmentmentioning

confidence: 96%

“…Upon calcination, one can convert all other phases into the β‐Ga 2 O 3 phase, which is the most thermodynamically stable phase . Literature survey indicates that the overall photocatalytic water splitting reaction has been scrutinized deliberately on the α‐Ga 2 O 3 and β‐Ga 2 O 3 phases and their mixtures . Jin and co‐workers have investigated mixed‐phase γ/β‐Ga 2 O 3 as a photocatalyst to understand the effect of the phase junction on the overall water‐splitting reaction.…”

Section: Spe For Energy Conversion and Environmental Treatmentmentioning

confidence: 99%

“…However, the contribution from the formed interfaces may yield different results for the overall water‐splitting reaction, with the interface between α‐Ga 2 O 3 and β‐Ga 2 O 3 as an example. It was posited that the photocatalytic performance at the phase junction of α‐Ga 2 O 3 and β‐Ga 2 O 3 was higher than that at the phase junction between γ‐Ga 2 O 3 and β‐Ga 2 O 3 since the disordered structure in the γ–β phase junction of Ga 2 O 3 provides defect sites that accelerate the charge‐carrier recombination processes, negating the expected efficiency for the overall water‐splitting reaction …”

Section: Spe For Energy Conversion and Environmental Treatmentmentioning

confidence: 99%

“…The formation of α–β phase junctions and the appearance of both phases on the surface are crucial in the proliferation of mobile electrons, thereby increasing the photocatalytic activity. Wang et al have examined the α–β phase junctions of Ga 2 O 3 in water‐splitting reactions in the presence of light and noted that the photoactivity was higher than that of standalone α‐ or β‐phase structures. With the α–β phase junctions of Ga 2 O 3 , the figures of merit reached three‐ and sevenfold higher than that of the individual α‐Ga 2 O 3 and β‐Ga 2 O 3 phases.…”

Section: Spe For Energy Conversion and Environmental Treatmentmentioning

confidence: 99%

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Structural‐Phase Catalytic Redox Reactions in Energy and Environmental Applications

Uddin

Zhang

et al. 2020

Advanced Materials

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The structure–property engineering of phase‐based materials for redox‐reactive energy conversion and environmental decontamination nanosystems, which are crucial for achieving feasible and sustainable energy and environment treatment technology, is discussed. An exhaustive overview of redox reaction processes, including electrocatalysis, photocatalysis, and photoelectrocatalysis, is given. Through examples of applications of these redox reactions, how structural phase engineering (SPE) strategies can influence the catalytic activity, selectivity, and stability is constructively reviewed and discussed. As observed, to date, much progress has been made in SPE to improve catalytic redox reactions. However, a number of highly intriguing, unresolved issues remain to be discussed, including solar photon‐to‐exciton conversion efficiency, exciton dissociation into active reductive/oxidative electrons/holes, dual‐ and multiphase junctions, selective adsorption/desorption, performance stability, sustainability, etc. To conclude, key challenges and prospects with SPE‐assisted redox reaction systems are highlighted, where further development for the advanced engineering of phase‐based materials will accelerate the sustainable (active, reliable, and scalable) production of valuable chemicals and energy, as well as facilitate environmental treatment.

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Section: Spe For Energy Conversion and Environmental Treatmentmentioning

confidence: 96%

Section: Spe For Energy Conversion and Environmental Treatmentmentioning

confidence: 99%

Section: Spe For Energy Conversion and Environmental Treatmentmentioning

confidence: 99%

Section: Spe For Energy Conversion and Environmental Treatmentmentioning

confidence: 99%

See 2 more Smart Citations

Structural‐Phase Catalytic Redox Reactions in Energy and Environmental Applications

Uddin

Zhang

et al. 2020

Advanced Materials

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“…[7][8][9][10] Therefore, enhancing charge separation, accelerating the transportation of electrons and preventing their recombination before they move to the surface active sites of the photocatalysts, and improving the light utilization play key roles in determining the solar energy to H 2 conversion efficiency. One of the effective strategies for charge transportation and recombination is to load lower work function materials (metals or other compounds) on the surface of semiconductors as co-catalyst, so that junctions can be formed after loading.…”

Section: Introductionmentioning

confidence: 99%

Heterojunction Ag–TiO₂ Nanopillars for Visible‐Light‐Driven Photocatalytic H₂ Production

Zhou

Ren

et al. 2014

ChemPlusChem

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Silver–titanium dioxide (Ag–TiO2) heterojunction nanopillars were fabricated by a facile one‐pot method coupled with further calcinations. The results showed that Ag nanoparticles were well dispersed on the surface of TiO2 nanopillars. The heterojunction composite nanopillars were uniform, approximately 10–20 μm in length and 500–800 nm in diameter. The nanojunctions and surface plasmon resonance effect of Ag–TiO2 heterojunction nanopillars were confirmed by scanning electron microscopy, transmission electron microscopy, and UV/Vis spectroscopy. The heterojunction Ag–TiO2 nanopillars showed good photocatalytic H2 production activities under visible‐light irradiation without costly platinum, owing to the good dispersion and closely contacted junctions, as well as the surface plasmon resonance effect and the porous one‐dimensional structure.

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Production of Hydrogen with Solar Energy

Schoonman

2015

Handbook of Clean Energy Systems

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One of the main requirements for a future Hydrogen Economy is a clean and efficient process for producing hydrogen using renewable energy sources. Hydrogen is a promising energy carrier because of its high energy content and clean combustion. In particular, the production of hydrogen from water and solar energy, i.e., photocatalysis and photoelectrolysis are methods for both renewable and sustainable energy production. Systems based on a photocatalyst powder suspended in an aqueous solution comprise single particles, layered materials, composite particles, or particle mixtures. The oxidation and reduction reactions take place at the same surface of a single particle. In order to avoid recombination processes, co‐catalysts are deposited on the surface of the photocatalyst to ensure that oxygen and hydrogen evolve at spatially separate surface sites. While water splitting can be carried out with coupled solar cells‐commercial water electrolyzers, the direct photoelectrolysis with a semiconductor photoelectrode is a more elegant and cheaper approach and the direct photoelectrolysis is the Holy Grail of electrochemistry, using the power of light. Here, the photoactive semiconductor is immersed in water and the photogenerated electrons and holes are directly used to reduce and oxidize water, respectively, in a PhotoElectroChemical cell (PEC cell). This article focuses on the materials science and engineering of photocatalysts, co‐catalysts, and photoelectrodes and will illustrate that the activities in the field of solar energy conversion into hydrogen are numerous. The principle of the PEC cell will be presented along with materials requirements for application in a PEC cell. Characterizations of the physical and chemical properties of state‐of‐the‐art and novel materials guide materials scientists to optimal photocatalysts and photoelectrodes. Engineering on an atomic scale is achieved by cation and anion doping effects, deviations from stoichiometry, and, in case of ternary and more complex materials, deviations from molecularity. Defect chemical aspects will be presented. To date, the decreasing length scale to the nanoscale of the functional materials for photocatalytical and photoelectrochemical applications attracts widespread attention. Besides water, also aqueous solutions of hydrobromic acid and hydrogen sulfide have been explored for hydrogen production using solar radiation. The large‐scale conversion of hydrogen sulfide from the Black Sea would be beneficial from an environmental and energy point of view.

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Photocatalytic Overall Water Splitting Promoted by an α–β phase Junction on Ga₂O₃

Cited by 149 publications

References 30 publications

Structural‐Phase Catalytic Redox Reactions in Energy and Environmental Applications

Structural‐Phase Catalytic Redox Reactions in Energy and Environmental Applications

Heterojunction Ag–TiO₂ Nanopillars for Visible‐Light‐Driven Photocatalytic H₂ Production

Production of Hydrogen with Solar Energy

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Photocatalytic Overall Water Splitting Promoted by an α–β phase Junction on Ga2O3

Cited by 149 publications

References 30 publications

Structural‐Phase Catalytic Redox Reactions in Energy and Environmental Applications

Structural‐Phase Catalytic Redox Reactions in Energy and Environmental Applications

Heterojunction Ag–TiO2 Nanopillars for Visible‐Light‐Driven Photocatalytic H2 Production

Production of Hydrogen with Solar Energy

Contact Info

Product

Resources

About

Photocatalytic Overall Water Splitting Promoted by an α–β phase Junction on Ga₂O₃

Heterojunction Ag–TiO₂ Nanopillars for Visible‐Light‐Driven Photocatalytic H₂ Production