Experimental Approach for Efficiency Determination of Photocatalytic Hydrogen Evolution

Lanfermann, Philipp; Weidmann, Christoph; Dege, Janina; Celik, Steven; Tasch, Alexander; Maaß, Mona Christin; Waitz, Thomas

doi:10.12691/wjce-9-4-11

Cited by 5 publications

(5 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure 8 shows the measured absorbance as function of the photocatalyst loadings in the methanol/water solution using different optical path lengths. The absorbance depends linearly on the photocatalyst concentration for low concentrations, which agrees with the Beer-Lambert law [33,34]. An extinction coefficient of 3.5 L g −1 cm −1 was determined by fitting the experimental data.…”

Section: Light Absorptionsupporting

confidence: 60%

“…According to the Beer–Lambert law, the absorption of light in a solution can be described by Equation 1 [ 33 ].…”

Section: Resultsmentioning

confidence: 99%

“…According to the Beer-Lambert law, the absorption of light in a solution can be described by Equation 1 [33]. (1) where A is the absorbance, I 0 is the intensity of light entering the solution perpendicularly to one face, I d is the intensity of light exiting the solution, ε is the extinction coefficient, c is the concentration of a light-absorbing solute, and d is the optical path length.…”

Section: Light Absorptionmentioning

confidence: 99%

See 2 more Smart Citations

Optimizing reaction conditions for the light-driven hydrogen evolution in a loop photoreactor

Li,

Kowalczyk,

Liessem

et al. 2024

Beilstein J. Org. Chem.

View full text Add to dashboard Cite

Photocatalytic hydrogen production from water is a promising way to fulfill energy demands and attain carbon emission reduction goals effectively. In this study, a loop photoreactor with a total volume of around 500 mL is presented for the photocatalytic hydrogen evolution using a Pt-loaded polymeric carbon nitride photocatalyst under 365 nm irradiation in the presence of sacrificial reducing agents. The fluid flow pattern of the developed photoreactor was characterized experimentally and the photon flux incident to the loop photoreactor was measured by chemical actinometry. The system displayed exceptional stability, with operation sustained over 70 hours. A design of experiment (DOE) analysis was used to systematically investigate the influence of key parameters – photon flux, photocatalyst loading, stirring speed, and inert gas flow rate – on the hydrogen generation rate. Linear relationships were found between hydrogen evolution rate and photon flux as well as inert gas flow rate. Photocatalyst loading and stirring speed also showed linear correlations, but could not be correctly described by DOE analysis. Instead, linear single parameter correlations could be applied. Notably, the loop photoreactor demonstrated an external photon efficiency up to 17 times higher than reported in literature studies, while scaling the reactor size by a factor of 10.

show abstract

Section: Light Absorptionsupporting

confidence: 60%

“…According to the Beer–Lambert law, the absorption of light in a solution can be described by Equation 1 [ 33 ].…”

Section: Resultsmentioning

confidence: 99%

Section: Light Absorptionmentioning

confidence: 99%

See 1 more Smart Citation

Optimizing reaction conditions for the light-driven hydrogen evolution in a loop photoreactor

Li,

Kowalczyk,

Liessem

et al. 2024

Beilstein J. Org. Chem.

View full text Add to dashboard Cite

show abstract

“…According to the Beer-Lambert law, the absorption of light in a solution can be described by Eq. ( 1) [33].…”

Section: Light Absorptionmentioning

confidence: 99%

Optimizing reaction conditions for the light-driven hydrogen evolution in a loop photoreactor

Li,

Kowalczyk,

Liessem

et al. 2023

Preprint

View full text Add to dashboard Cite

Photocatalytic hydrogen production from water is a promising way to fulfill energy demands and attain carbon emission reduction goals effectively. In this study, a loop photoreactor with a total volume of around 500 mL is presented for the photocatalytic hydrogen evolution using a Pt-loaded polymeric carbon nitride photocatalyst under 365 nm irradiation in the presence of sacrificial reducing agents. The fluid flow pattern of the developed photoreactor was characterized experimentally and the photon flux incident to the loop photoreactor was measured by chemical actinometry. The system displayed exceptional stability, with operation sustained over 70 hours. A Design of Experiment (DOE) analysis was used to systematically investigate the influence of key parameters - photon flux, photocatalyst loading, stirring speed, and inert gas flow rate - on the hydrogen generation rate. Linear relationships were found between hydrogen evolution rate and photon flux and inert gas flow rate. Photocatalyst loading and stirring speed also showed linear correlations, but could not be correctly described by DOE analysis. Instead, linear single parameter correlations could be applied. Notably, the loop photoreactor demonstrated an external photon efficiency up to 17 times higher than reported in literature studies, while scaling the reactor size by a factor of 10.

show abstract

“…Die Effizienz der Reaktion werteten sie aus, indem sie das entstandene Gasvolumen bestimmten. 13) Bohrmann-Linde und Venzlaff zeigten eine Möglichkeit, Biomasse zu verwerten. Dazu entwickelten sie ein Experiment, das mit einem Titandioxid-Platin-Photokatalysator aus der Modellsubstanz Glucose Wasserstoff erzeugt.…”

Section: Photochemieunclassified

Trendbericht: Chemiedidaktik 2022

Maaß¹,

Lanfermann²,

Habig³

2022

Nachr Chem

Self Cite

View full text Add to dashboard Cite

I n den letzten Jahren haben sich die Rahmenbedingungen für Bildung ständig verändert, etwa durch coronabedingte Schulschließungen und Lernende, die kein Deutsch verstehen. Um Lehrende und Lernende zu unterstützen, erschließen Chemiedidaktiker:innen daher fortlaufend (neue) Themen, entwickeln Experimente und Konzepte für den Unterricht und untersuchen kontinuierlich Lehr-Lernprozesse. Diese zwei Bereiche chemiedidaktischer Forschungdie experimentell-konzeptionelle und die empirische -und deren Entwicklung in den Jahren 2021/22 präsentiert dieser Bericht. Um Trends in der experimentellkonzeptionellen Forschung zu erkennen, wurden von September 2021 bis August 2022 149 Artikel in folgenden nationalen Journalen gesichtet: • Chemie konkret (CHEMKON) • Naturwissenschaften im Unterricht Chemie (NiU-C) • Chemie in unserer Zeit (ChiuZ) • Journal des Verbands zur Förderung des MINT-Unterrichts (MNU) Berücksichtigt wurden auch 119 Artikel in den internationalen Journalen:

show abstract

Experimental Approach for Efficiency Determination of Photocatalytic Hydrogen Evolution

Cited by 5 publications

References 6 publications

Optimizing reaction conditions for the light-driven hydrogen evolution in a loop photoreactor

Optimizing reaction conditions for the light-driven hydrogen evolution in a loop photoreactor

Optimizing reaction conditions for the light-driven hydrogen evolution in a loop photoreactor

Trendbericht: Chemiedidaktik 2022

Contact Info

Product

Resources

About