Note: Development of fast heating inert gas annealing apparatus operated at atmospheric pressure

The development of efficient photocatalysts for sustainable hydrogen production via water splitting is vital for advancing renewable energy technologies. In this study, we present the synthesis and characterization of a novel visible-light-active photocatalyst comprising hedgehog-shaped zinc oxide (ZnO) nanostructures coupled with graphene quantum dots (GQDs). Optical properties assessed by UV−visible and photoluminescence (PL) spectroscopy revealed that the ZnO/GQDs heterostructure possessed a reduced band gap (2.86 eV) compared with pristine ZnO (3.10 eV), resulting in improved light absorption and charge separation. Electrochemical analyses indicated a significantly higher photocurrent response and lower charge transfer resistance for the ZnO/GQDs heterostructure compared with the pristine ZnO nanostructure. Photocatalytic tests demonstrated that the ZnO/ GQDs heterostructure achieved over 3-fold higher hydrogen (H 2 ) production rates, with an apparent quantum yield (AQY) of 1.51% at 440 nm, and maintained stable activity over prolonged reaction periods. These results highlight the enhanced photocatalytic efficiency and stability of the ZnO/GQDs heterostructure, underscoring its potential as a high-performance photocatalyst for sustainable hydrogen generation. The synergistic effects between ZnO nanostructures and GQDs offer valuable insights into the design of advanced photocatalytic materials for renewable energy applications.

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Design and development of a multipurpose portable heating setup for 45S5 bioglass and other ceramic samples

Singh

Rao

Pyare

2020

Review of Scientific Instruments

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As per the voices in the precision manufacturing industries, the machining of brittle materials such as glass and diamond is intricate owing to their thermo-mechanical properties. Machining of the brittle material with a localized heating method produced softness in the work material during the operation, resulting in microcracks and voids on the finished surface due to thermal stresses. Such pressing issues are solved by dry machining with bulk heating. The objective of the present research is to develop a sophisticated lab-made portable multipurpose heating setup for enabling various potent applications such as machining, elevated temperature scratch and indentation tests, and grinding, among other things, on hard and brittle materials. The mentioned process is done by softening the material with preheating of the samples. The overall dimensions of the developed setup are 105 × 150 × 53 mm3. This setup has been evaluated at different temperatures of the 45S5 bioglass sample surface up to 426 °C and is capable of holding and heating the samples.

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Note: Development of fast heating inert gas annealing apparatus operated at atmospheric pressure

Cited by 4 publications

References 9 publications

Shake up satellites and fluorescence property of carbon nitride and hydrogenated carbon nitride: Annealing effect

Shake up satellites and fluorescence property of carbon nitride and hydrogenated carbon nitride: Annealing effect

Hedgehog Zinc Oxide–Graphene Quantum Dot Heterostructures as Photocatalysts for Visible-Light-Driven Water Splitting

Design and development of a multipurpose portable heating setup for 45S5 bioglass and other ceramic samples

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