Details
| Original language | English |
|---|---|
| Pages (from-to) | 737-747 |
| Number of pages | 11 |
| Journal | Topics in catalysis |
| Volume | 64 |
| Issue number | 13-16 |
| Early online date | 12 Jun 2020 |
| Publication status | Published - Nov 2021 |
Abstract
High photon conversion efficiencies and low-cost materials are crucial for implementing photocatalytic solutions in large scale applications. To improve the conversion efficiencies, knowledge on the lifetime and dynamics of photogenerated charge carriers is fundamental, for which transient absorption spectroscopy has provided important insights. Regarding the cost of the materials, one approach to decrease it is mixing the photocatalyst with cheaper additives while avoiding a significant loss in its activity. In this short review we summarize the findings of our group dealing with both aspects. A new model to fit transient absorption decays, based on fractal kinetics, is discussed. The model has been applied to the transient decays of TiO 2 mixtures with binary particle size distributions and of TiO 2 mixtures with a priori inert additives. In both cases, the insights obtained from the model were crucial to explain the photocatalytic activities of the mixtures.
Keywords
- Fractal kinetics, Photocatalysis, Titanium dioxide, Transient absorption spectroscopy
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
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In: Topics in catalysis, Vol. 64, No. 13-16, 11.2021, p. 737-747.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Charge Carriers in Commercial Photocatalysts
T2 - Fractal Kinetics and Effect of “Inert” Additives
AU - Günnemann, Carsten
AU - Curti, Mariano
AU - Sieland, Fabian
AU - Bahnemann, Detlef W.
N1 - Funding Information: Open Access funding provided by Projekt DEAL. C.G. acknowledges financial support from the Leibniz Universität Hannover within the program “Wege in die Forschung II”. M.C. is grateful to the Deutscher Akademischer Austauschdienst (DAAD) together with the Ministerio de Educación (Argentina) for his ALEARG scholarship. This work was supported by Saint-Petersburg State University via a research Grant ID 32706707.
PY - 2021/11
Y1 - 2021/11
N2 - High photon conversion efficiencies and low-cost materials are crucial for implementing photocatalytic solutions in large scale applications. To improve the conversion efficiencies, knowledge on the lifetime and dynamics of photogenerated charge carriers is fundamental, for which transient absorption spectroscopy has provided important insights. Regarding the cost of the materials, one approach to decrease it is mixing the photocatalyst with cheaper additives while avoiding a significant loss in its activity. In this short review we summarize the findings of our group dealing with both aspects. A new model to fit transient absorption decays, based on fractal kinetics, is discussed. The model has been applied to the transient decays of TiO 2 mixtures with binary particle size distributions and of TiO 2 mixtures with a priori inert additives. In both cases, the insights obtained from the model were crucial to explain the photocatalytic activities of the mixtures.
AB - High photon conversion efficiencies and low-cost materials are crucial for implementing photocatalytic solutions in large scale applications. To improve the conversion efficiencies, knowledge on the lifetime and dynamics of photogenerated charge carriers is fundamental, for which transient absorption spectroscopy has provided important insights. Regarding the cost of the materials, one approach to decrease it is mixing the photocatalyst with cheaper additives while avoiding a significant loss in its activity. In this short review we summarize the findings of our group dealing with both aspects. A new model to fit transient absorption decays, based on fractal kinetics, is discussed. The model has been applied to the transient decays of TiO 2 mixtures with binary particle size distributions and of TiO 2 mixtures with a priori inert additives. In both cases, the insights obtained from the model were crucial to explain the photocatalytic activities of the mixtures.
KW - Fractal kinetics
KW - Photocatalysis
KW - Titanium dioxide
KW - Transient absorption spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85086333704&partnerID=8YFLogxK
U2 - 10.1007/s11244-020-01282-3
DO - 10.1007/s11244-020-01282-3
M3 - Article
VL - 64
SP - 737
EP - 747
JO - Topics in catalysis
JF - Topics in catalysis
SN - 1022-5528
IS - 13-16
ER -