Enhanced hydrogen selectivity via photo-engineered surface defects for methanol steam reformation using zinc oxide–copper nanocomposite catalysts

Danwittayakul, Supamas; Lakshman, Karthik; Al-Harthi, S. H.; Dutta, Joydeep

doi:10.1016/j.apcata.2013.11.040

Cited by 10 publications

(4 citation statements)

References 40 publications

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“…Commercial Fe wire (0.2 mm in diameter) was purchased Nano Tech (Korea), and electrical pulse equipment (NTi-mini P, Nano Tech, Korea) was used to fabricate the Fe 3 O 4 -Fe nanohybrids and the Fe 3 O 4 nanospheres. As a similar process reported in previous works 25 , 26 . Fe-based aqueous nanocolloidal suspension could be successfully obtained.…”

Section: Methodssupporting

confidence: 87%

“…Comparing the Fe 3 O 4 -Fe nanohybrids and the Fe 3 O 4 nanoflakes of O 1 s XPS spectra, the O 1 s peak of the Fe 3 O 4 -Fe nanohybrids is lower binding energy than that of the Fe 3 O 4 nanospheres. Shift of the O 1 s peak to lower binding energy indicates oxygen vacancy 26 . Oxygen vacancy generated the charge of the defect state, which can expected vigorous electrocatalytic activity.…”

Section: Resultsmentioning

confidence: 99%

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Fe-based hybrid electrocatalysts for nonaqueous lithium-oxygen batteries

Lee

Dar

et al. 2017

Sci Rep

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Lithium–oxygen batteries promise high energy densities, but are confronted with challenges, such as high overpotentials and sudden death during discharge–charge cycling, because the oxygen electrode is covered with the insulating discharge product, Li2O2. Here, we synthesized low–cost Fe–based nanocomposites via an electrical wire pulse process, as a hybrid electrocatalyst for the oxygen electrode of Li–O2 batteries. Fe3O4-Fe nanohybrids–containing electrodes exhibited a high discharge capacity (13,890 mA h gc −1 at a current density of 500 mA gc −1), long cycle stability (100 cycles at a current rate of 500 mA gc −1 and fixed capacity regime of 1,000 mA h gc −1), and low overpotential (1.39 V at 40 cycles). This superior performance resulted from the good electrical conductivity of the Fe metal nanoparticles during discharge–charge cycling, which could enhance the oxygen reduction reaction and oxygen evolution reaction activities. We have demonstrated the increased electrical conductivity of the Fe3O4-Fe nanohybrids using electrochemical impedance spectroscopy.

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Section: Methodssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Fe-based hybrid electrocatalysts for nonaqueous lithium-oxygen batteries

Lee

Dar

et al. 2017

Sci Rep

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“…The most used commercial process is steam methane reforming, which contributes to 80 to 85 % of global hydrogen production, followed by coal gasification and electrolysis. [6][7][8] Economical and efficient methods to produce hydrogen where renewable energies like solar, wind, and biomass are involved are attracting continued attention. The use of solar energy for hydrogen production is considered the most promising because of being an unlimited resource with irradiation reaching 6 kW h m -2 .…”

Section: Introductionmentioning

confidence: 99%

Cellulose as sacrificial agents for enhanced photoactivated hydrogen production

Alvarado-Ávila

Luca

Edlund

et al. 2023

Sustainable Energy Fuels

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“…The interfacial chemistry between two semiconductors or a metal and a semiconductor is important in determining the charge transfer across the interface that dictates the performance in areas like catalysis [1], solar cells [2], and other schemes involving charge separation processes. In a structure comprising a semiconductor QD deposited on top of a high surface area semiconducting nanostructured oxide, like in the sensitized solar cells, the current flowing across the QD-oxide junction is directly proportional to the distance between the QDs and the oxide material [2,3].…”

Section: Introductionmentioning

confidence: 99%

Improved Sensitization of Zinc Oxide Nanorods by Cadmium Telluride Quantum Dots through Charge Induced Hydrophilic Surface Generation

Jing

Han

Shi

et al. 2014

Journal of Nanomaterials

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This paper reports on UV-mediated enhancement in the sensitization of semiconductor quantum dots (QDs) on zinc oxide (ZnO) nanorods, improving the charge transfer efficiency across the QD-ZnO interface. The improvement was primarily due to the reduction in the interfacial resistance achieved via the incorporation of UV light induced surface defects on zinc oxide nanorods. The photoinduced defects were characterized by XPS, FTIR, and water contact angle measurements, which demonstrated an increase in the surface defects (oxygen vacancies) in the ZnO crystal, leading to an increase in the active sites available for the QD attachment. As a proof of concept, a model cadmium telluride (CdTe) QD solar cell was fabricated using the defect engineered ZnO photoelectrodes, which showed ∼10% increase in photovoltage and ∼66% improvement in the photocurrent compared to the defect-free photoelectrodes. The improvement in the photocurrent was mainly attributed to the enhancement in the charge transfer efficiency across the defect rich QD-ZnO interface, which was indicated by the higher quenching of the CdTe QD photoluminescence upon sensitization.

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Enhanced hydrogen selectivity via photo-engineered surface defects for methanol steam reformation using zinc oxide–copper nanocomposite catalysts

Cited by 10 publications

References 40 publications

Fe-based hybrid electrocatalysts for nonaqueous lithium-oxygen batteries

Fe-based hybrid electrocatalysts for nonaqueous lithium-oxygen batteries

Cellulose as sacrificial agents for enhanced photoactivated hydrogen production

Improved Sensitization of Zinc Oxide Nanorods by Cadmium Telluride Quantum Dots through Charge Induced Hydrophilic Surface Generation

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