---
_id: '56074'
abstract:
- lang: eng
text: Effective photoinduced charge transfer makes molecular bimetallic assemblies
attractive for applications as active light‐induced proton reduction systems.
Developing competitive base metal dyads is mandatory for a more sustainable future.
However, the electron transfer mechanisms from the photosensitizer to the proton
reduction catalyst in base metal dyads remain so far unexplored. A Fe─Co dyad
that exhibits photocatalytic H2 production activity is studied using femtosecond
X‐ray emission spectroscopy, complemented by ultrafast optical spectroscopy and
theoretical time‐dependent DFT calculations, to understand the electronic and
structural dynamics after photoexcitation and during the subsequent charge transfer
process from the Fe(II) photosensitizer to the cobaloxime catalyst. This novel
approach enables the simultaneous measurement of the transient X‐ray emission
at the iron and cobalt K‐edges in a two‐color experiment. With this methodology,
the excited state dynamics are correlated to the electron transfer processes,
and evidence of the Fe→Co electron transfer as an initial step of proton reduction
activity is unraveled.
author:
- first_name: Michał
full_name: Nowakowski, Michał
id: '78878'
last_name: Nowakowski
orcid: 0000-0002-3734-7011
- first_name: Marina
full_name: Huber‐Gedert, Marina
last_name: Huber‐Gedert
- first_name: Hossam
full_name: Elgabarty, Hossam
id: '60250'
last_name: Elgabarty
orcid: 0000-0002-4945-1481
- first_name: Aleksandr
full_name: Kalinko, Aleksandr
last_name: Kalinko
- first_name: Jacek
full_name: Kubicki, Jacek
last_name: Kubicki
- first_name: Ahmet
full_name: Kertmen, Ahmet
last_name: Kertmen
- first_name: Natalia
full_name: Lindner, Natalia
last_name: Lindner
- first_name: Dmitry
full_name: Khakhulin, Dmitry
last_name: Khakhulin
- first_name: Frederico A.
full_name: Lima, Frederico A.
last_name: Lima
- first_name: Tae‐Kyu
full_name: Choi, Tae‐Kyu
last_name: Choi
- first_name: Mykola
full_name: Biednov, Mykola
last_name: Biednov
- first_name: Lennart
full_name: Schmitz, Lennart
id: '53140'
last_name: Schmitz
- first_name: Natalia
full_name: Piergies, Natalia
last_name: Piergies
- first_name: Peter
full_name: Zalden, Peter
last_name: Zalden
- first_name: Katerina
full_name: Kubicek, Katerina
last_name: Kubicek
- first_name: Angel
full_name: Rodriguez‐Fernandez, Angel
last_name: Rodriguez‐Fernandez
- first_name: Mohammad Alaraby
full_name: Salem, Mohammad Alaraby
last_name: Salem
- first_name: Sophie E.
full_name: Canton, Sophie E.
last_name: Canton
- first_name: Christian
full_name: Bressler, Christian
last_name: Bressler
- first_name: Thomas D.
full_name: Kühne, Thomas D.
last_name: Kühne
- first_name: Wojciech
full_name: Gawelda, Wojciech
last_name: Gawelda
- first_name: Matthias
full_name: Bauer, Matthias
id: '47241'
last_name: Bauer
orcid: 0000-0002-9294-6076
citation:
ama: Nowakowski M, Huber‐Gedert M, Elgabarty H, et al. Ultrafast Two‐Color X‐Ray
Emission Spectroscopy Reveals Excited State Landscape in a Base Metal Dyad. Advanced
Science. Published online 2024. doi:10.1002/advs.202404348
apa: Nowakowski, M., Huber‐Gedert, M., Elgabarty, H., Kalinko, A., Kubicki, J.,
Kertmen, A., Lindner, N., Khakhulin, D., Lima, F. A., Choi, T., Biednov, M., Schmitz,
L., Piergies, N., Zalden, P., Kubicek, K., Rodriguez‐Fernandez, A., Salem, M.
A., Canton, S. E., Bressler, C., … Bauer, M. (2024). Ultrafast Two‐Color X‐Ray
Emission Spectroscopy Reveals Excited State Landscape in a Base Metal Dyad. Advanced
Science. https://doi.org/10.1002/advs.202404348
bibtex: '@article{Nowakowski_Huber‐Gedert_Elgabarty_Kalinko_Kubicki_Kertmen_Lindner_Khakhulin_Lima_Choi_et
al._2024, title={Ultrafast Two‐Color X‐Ray Emission Spectroscopy Reveals Excited
State Landscape in a Base Metal Dyad}, DOI={10.1002/advs.202404348},
journal={Advanced Science}, publisher={Wiley}, author={Nowakowski, Michał and
Huber‐Gedert, Marina and Elgabarty, Hossam and Kalinko, Aleksandr and Kubicki,
Jacek and Kertmen, Ahmet and Lindner, Natalia and Khakhulin, Dmitry and Lima,
Frederico A. and Choi, Tae‐Kyu and et al.}, year={2024} }'
chicago: Nowakowski, Michał, Marina Huber‐Gedert, Hossam Elgabarty, Aleksandr Kalinko,
Jacek Kubicki, Ahmet Kertmen, Natalia Lindner, et al. “Ultrafast Two‐Color X‐Ray
Emission Spectroscopy Reveals Excited State Landscape in a Base Metal Dyad.” Advanced
Science, 2024. https://doi.org/10.1002/advs.202404348.
ieee: 'M. Nowakowski et al., “Ultrafast Two‐Color X‐Ray Emission Spectroscopy
Reveals Excited State Landscape in a Base Metal Dyad,” Advanced Science,
2024, doi: 10.1002/advs.202404348.'
mla: Nowakowski, Michał, et al. “Ultrafast Two‐Color X‐Ray Emission Spectroscopy
Reveals Excited State Landscape in a Base Metal Dyad.” Advanced Science,
Wiley, 2024, doi:10.1002/advs.202404348.
short: M. Nowakowski, M. Huber‐Gedert, H. Elgabarty, A. Kalinko, J. Kubicki, A.
Kertmen, N. Lindner, D. Khakhulin, F.A. Lima, T. Choi, M. Biednov, L. Schmitz,
N. Piergies, P. Zalden, K. Kubicek, A. Rodriguez‐Fernandez, M.A. Salem, S.E. Canton,
C. Bressler, T.D. Kühne, W. Gawelda, M. Bauer, Advanced Science (2024).
date_created: 2024-09-05T11:31:30Z
date_updated: 2025-08-15T12:49:56Z
department:
- _id: '306'
doi: 10.1002/advs.202404348
keyword:
- Photo
- Xray
language:
- iso: eng
publication: Advanced Science
publication_identifier:
issn:
- 2198-3844
- 2198-3844
publication_status: published
publisher: Wiley
status: public
title: Ultrafast Two‐Color X‐Ray Emission Spectroscopy Reveals Excited State Landscape
in a Base Metal Dyad
type: journal_article
user_id: '48467'
year: '2024'
...
---
_id: '52346'
abstract:
- lang: eng
text: Promising cathode materials for fluoride-ion batteries (FIBs) are 3d transition
metal containing oxides with Ruddlesden-Popper-type structure. So far, multi-elemental
compositions were not investigated, but could alternate electrochemical performance
similar to what has been found for cathode materials for lithium-ion batteries.
Within this study, we investigate RP type La2Ni0.75Co0.25O4.08 as an intercalation-based
active cathode material for all-solid-state FIBs. We determine the structural
changes of La2Ni0.75Co0.25O4.08 during fluoride intercalation / de-intercalation
by ex-situ X-ray diffraction, which showed that F- insertion leads to transformation
of the parent phase to three different phases. Changes in Ni and Co oxidation
states and coordination environment were examined by X-ray absorption spectroscopy
and magnetic measurements in order to understand the complex reaction behaviour
of the phases in detail, showing that the two transition metals behave differently
in the charging and discharging process. Under optimized operating conditions,
a cycle life of 120 cycles at a critical cut-off capacity of 40 mAh g-1 against
Pb/PbF2 was obtained, which is one of the highest observed for intercalation electrode
materials in FIBs so far. The average Coulombic efficiencies ranged from 85% to
90%. Thus, La2Ni0.75Co0.25O4.08 could be a promising candidate for cycling-stable
high-energy cathode materials for all-solid-state FIBs
author:
- first_name: Vanita
full_name: Vanita, Vanita
last_name: Vanita
- first_name: Aamir Iqbal
full_name: Waidha, Aamir Iqbal
last_name: Waidha
- first_name: Sami
full_name: Vasala, Sami
last_name: Vasala
- first_name: Pascal
full_name: Puphal, Pascal
last_name: Puphal
- first_name: Roland
full_name: Schoch, Roland
id: '48467'
last_name: Schoch
orcid: 0000-0003-2061-7289
- first_name: Pieter
full_name: Glatzel, Pieter
last_name: Glatzel
- first_name: Matthias
full_name: Bauer, Matthias
id: '47241'
last_name: Bauer
orcid: 0000-0002-9294-6076
- first_name: Oliver
full_name: Clemens, Oliver
last_name: Clemens
citation:
ama: Vanita V, Waidha AI, Vasala S, et al. Insights into the First Multi-Transition-Metal
Containing Ruddlesden Popper-Type Cathode for all-solid-state Fluoride Ion Batteries.
Journal of Materials Chemistry A. 2024;(12). doi:10.1039/d4ta00704b
apa: Vanita, V., Waidha, A. I., Vasala, S., Puphal, P., Schoch, R., Glatzel, P.,
Bauer, M., & Clemens, O. (2024). Insights into the First Multi-Transition-Metal
Containing Ruddlesden Popper-Type Cathode for all-solid-state Fluoride Ion Batteries.
Journal of Materials Chemistry A, 12. https://doi.org/10.1039/d4ta00704b
bibtex: '@article{Vanita_Waidha_Vasala_Puphal_Schoch_Glatzel_Bauer_Clemens_2024,
title={Insights into the First Multi-Transition-Metal Containing Ruddlesden Popper-Type
Cathode for all-solid-state Fluoride Ion Batteries}, DOI={10.1039/d4ta00704b},
number={12}, journal={Journal of Materials Chemistry A}, publisher={Royal Society
of Chemistry (RSC)}, author={Vanita, Vanita and Waidha, Aamir Iqbal and Vasala,
Sami and Puphal, Pascal and Schoch, Roland and Glatzel, Pieter and Bauer, Matthias
and Clemens, Oliver}, year={2024} }'
chicago: Vanita, Vanita, Aamir Iqbal Waidha, Sami Vasala, Pascal Puphal, Roland
Schoch, Pieter Glatzel, Matthias Bauer, and Oliver Clemens. “Insights into the
First Multi-Transition-Metal Containing Ruddlesden Popper-Type Cathode for All-Solid-State
Fluoride Ion Batteries.” Journal of Materials Chemistry A, no. 12 (2024).
https://doi.org/10.1039/d4ta00704b.
ieee: 'V. Vanita et al., “Insights into the First Multi-Transition-Metal
Containing Ruddlesden Popper-Type Cathode for all-solid-state Fluoride Ion Batteries,”
Journal of Materials Chemistry A, no. 12, 2024, doi: 10.1039/d4ta00704b.'
mla: Vanita, Vanita, et al. “Insights into the First Multi-Transition-Metal Containing
Ruddlesden Popper-Type Cathode for All-Solid-State Fluoride Ion Batteries.” Journal
of Materials Chemistry A, no. 12, Royal Society of Chemistry (RSC), 2024,
doi:10.1039/d4ta00704b.
short: V. Vanita, A.I. Waidha, S. Vasala, P. Puphal, R. Schoch, P. Glatzel, M. Bauer,
O. Clemens, Journal of Materials Chemistry A (2024).
date_created: 2024-03-07T10:01:09Z
date_updated: 2025-08-15T12:50:31Z
department:
- _id: '306'
doi: 10.1039/d4ta00704b
issue: '12'
keyword:
- Xray
language:
- iso: eng
publication: Journal of Materials Chemistry A
publication_identifier:
issn:
- 2050-7488
- 2050-7496
publication_status: published
publisher: Royal Society of Chemistry (RSC)
status: public
title: Insights into the First Multi-Transition-Metal Containing Ruddlesden Popper-Type
Cathode for all-solid-state Fluoride Ion Batteries
type: journal_article
user_id: '48467'
year: '2024'
...
---
_id: '60216'
abstract:
- lang: eng
text: Hydride donors such as DIBAL or CuH react with ZnO and ZrO2 via hydrogen spillover.
This suggests that hydrogen spillover in catalysts based on these metal oxides
may take place via initial hydride transfer and not via proton–electron transfer.
author:
- first_name: Michael
full_name: Benz, Michael
last_name: Benz
- first_name: Osman
full_name: Bunjaku, Osman
last_name: Bunjaku
- first_name: Michał
full_name: Nowakowski, Michał
id: '78878'
last_name: Nowakowski
orcid: 0000-0002-3734-7011
- first_name: Alexander
full_name: Allgaier, Alexander
last_name: Allgaier
- first_name: Indro
full_name: Biswas, Indro
last_name: Biswas
- first_name: Joris
full_name: van Slageren, Joris
last_name: van Slageren
- first_name: Matthias
full_name: Bauer, Matthias
id: '47241'
last_name: Bauer
orcid: 0000-0002-9294-6076
- first_name: Deven P.
full_name: Estes, Deven P.
last_name: Estes
citation:
ama: 'Benz M, Bunjaku O, Nowakowski M, et al. Hydrogen spillover through hydride
transfer: the reaction of ZnO and ZrO2 with strong hydride donors. Catalysis
Science & Technology. 2024;14(20):5854-5863. doi:10.1039/d4cy00504j'
apa: 'Benz, M., Bunjaku, O., Nowakowski, M., Allgaier, A., Biswas, I., van Slageren,
J., Bauer, M., & Estes, D. P. (2024). Hydrogen spillover through hydride transfer:
the reaction of ZnO and ZrO2 with strong hydride donors. Catalysis Science
& Technology, 14(20), 5854–5863. https://doi.org/10.1039/d4cy00504j'
bibtex: '@article{Benz_Bunjaku_Nowakowski_Allgaier_Biswas_van Slageren_Bauer_Estes_2024,
title={Hydrogen spillover through hydride transfer: the reaction of ZnO and ZrO2
with strong hydride donors}, volume={14}, DOI={10.1039/d4cy00504j},
number={20}, journal={Catalysis Science & Technology}, publisher={Royal Society
of Chemistry (RSC)}, author={Benz, Michael and Bunjaku, Osman and Nowakowski,
Michał and Allgaier, Alexander and Biswas, Indro and van Slageren, Joris and Bauer,
Matthias and Estes, Deven P.}, year={2024}, pages={5854–5863} }'
chicago: 'Benz, Michael, Osman Bunjaku, Michał Nowakowski, Alexander Allgaier, Indro
Biswas, Joris van Slageren, Matthias Bauer, and Deven P. Estes. “Hydrogen Spillover
through Hydride Transfer: The Reaction of ZnO and ZrO2 with Strong Hydride Donors.”
Catalysis Science & Technology 14, no. 20 (2024): 5854–63. https://doi.org/10.1039/d4cy00504j.'
ieee: 'M. Benz et al., “Hydrogen spillover through hydride transfer: the
reaction of ZnO and ZrO2 with strong hydride donors,” Catalysis Science &
Technology, vol. 14, no. 20, pp. 5854–5863, 2024, doi: 10.1039/d4cy00504j.'
mla: 'Benz, Michael, et al. “Hydrogen Spillover through Hydride Transfer: The Reaction
of ZnO and ZrO2 with Strong Hydride Donors.” Catalysis Science & Technology,
vol. 14, no. 20, Royal Society of Chemistry (RSC), 2024, pp. 5854–63, doi:10.1039/d4cy00504j.'
short: M. Benz, O. Bunjaku, M. Nowakowski, A. Allgaier, I. Biswas, J. van Slageren,
M. Bauer, D.P. Estes, Catalysis Science & Technology 14 (2024) 5854–5863.
date_created: 2025-06-16T08:55:24Z
date_updated: 2025-08-15T12:42:34Z
department:
- _id: '306'
doi: 10.1039/d4cy00504j
intvolume: ' 14'
issue: '20'
keyword:
- Xray
language:
- iso: eng
page: 5854-5863
publication: Catalysis Science & Technology
publication_identifier:
issn:
- 2044-4753
- 2044-4761
publication_status: published
publisher: Royal Society of Chemistry (RSC)
status: public
title: 'Hydrogen spillover through hydride transfer: the reaction of ZnO and ZrO2
with strong hydride donors'
type: journal_article
user_id: '48467'
volume: 14
year: '2024'
...
---
_id: '54024'
abstract:
- lang: eng
text: Transition metal complexes, particularly copper hydrides, play an important
role in various catalytic processes and molecular inorganic chemistry. This study
employs synchrotron hard X‐ray spectroscopy to gain insights into the geometric
and electronic properties of copper hydrides as potential catalysts for CO2 hydrogenation.
The potential of high energy resolution X‐ray absorption near‐edge structure (HERFD‐XANES)
and valence‐to‐core X‐ray emission (VtC‐XES) is demonstrated with measurement
on Stryker's reagent (Cu6H6) and [Cu3(μ3‐H)(dpmppe)2](PF6)2 (Cu3H), alongside
a non‐hydride copper compound (Cu‐I). The XANES analysis reveals that coordination
geometries strongly influence the spectra, providing only indirect details about
hydride coordination. The VtC‐XES analysis exhibits a distinct signal around 8975
eV, offering a diagnostic tool to identify hydride ligands. Theoretical calculations
support and extend these findings by comparing hydride‐containing complexes with
their hydride‐free counterparts.
article_type: original
author:
- first_name: Lorena
full_name: Fritsch, Lorena
id: '44418'
last_name: Fritsch
- first_name: Pia
full_name: Rehsies, Pia
id: '46959'
last_name: Rehsies
- first_name: Wael
full_name: Barakat, Wael
last_name: Barakat
- first_name: Deven P.
full_name: Estes, Deven P.
last_name: Estes
- first_name: Matthias
full_name: Bauer, Matthias
id: '47241'
last_name: Bauer
orcid: 0000-0002-9294-6076
citation:
ama: Fritsch L, Rehsies P, Barakat W, Estes DP, Bauer M. Detection and Characterization
of Hydride Ligands in Copper Complexes by Hard X‐ray Spectroscopy. Chemistry
– A European Journal. 2024;30(36). doi:10.1002/chem.202400357
apa: Fritsch, L., Rehsies, P., Barakat, W., Estes, D. P., & Bauer, M. (2024).
Detection and Characterization of Hydride Ligands in Copper Complexes by Hard
X‐ray Spectroscopy. Chemistry – A European Journal, 30(36). https://doi.org/10.1002/chem.202400357
bibtex: '@article{Fritsch_Rehsies_Barakat_Estes_Bauer_2024, title={Detection and
Characterization of Hydride Ligands in Copper Complexes by Hard X‐ray Spectroscopy},
volume={30}, DOI={10.1002/chem.202400357},
number={36}, journal={Chemistry – A European Journal}, publisher={Wiley}, author={Fritsch,
Lorena and Rehsies, Pia and Barakat, Wael and Estes, Deven P. and Bauer, Matthias},
year={2024} }'
chicago: Fritsch, Lorena, Pia Rehsies, Wael Barakat, Deven P. Estes, and Matthias
Bauer. “Detection and Characterization of Hydride Ligands in Copper Complexes
by Hard X‐ray Spectroscopy.” Chemistry – A European Journal 30, no. 36
(2024). https://doi.org/10.1002/chem.202400357.
ieee: 'L. Fritsch, P. Rehsies, W. Barakat, D. P. Estes, and M. Bauer, “Detection
and Characterization of Hydride Ligands in Copper Complexes by Hard X‐ray Spectroscopy,”
Chemistry – A European Journal, vol. 30, no. 36, 2024, doi: 10.1002/chem.202400357.'
mla: Fritsch, Lorena, et al. “Detection and Characterization of Hydride Ligands
in Copper Complexes by Hard X‐ray Spectroscopy.” Chemistry – A European Journal,
vol. 30, no. 36, Wiley, 2024, doi:10.1002/chem.202400357.
short: L. Fritsch, P. Rehsies, W. Barakat, D.P. Estes, M. Bauer, Chemistry – A European
Journal 30 (2024).
date_created: 2024-05-07T08:41:11Z
date_updated: 2025-08-15T12:51:10Z
department:
- _id: '306'
doi: 10.1002/chem.202400357
intvolume: ' 30'
issue: '36'
keyword:
- Xray
language:
- iso: eng
publication: Chemistry – A European Journal
publication_identifier:
issn:
- 0947-6539
- 1521-3765
publication_status: published
publisher: Wiley
status: public
title: Detection and Characterization of Hydride Ligands in Copper Complexes by Hard
X‐ray Spectroscopy
type: journal_article
user_id: '48467'
volume: 30
year: '2024'
...
---
_id: '41025'
abstract:
- lang: eng
text: We investigate the structure-activity correlations of methanation catalysts
obtained by thermal decomposition of a Ni-based metal-organic framework, using
pair distribution function, X-ray absorption spectroscopy and X-ray diffraction.
author:
- first_name: Nils
full_name: Prinz, Nils
last_name: Prinz
- first_name: Leif
full_name: Schwensow, Leif
last_name: Schwensow
- first_name: Sven
full_name: Strübbe, Sven
id: '76968'
last_name: Strübbe
- first_name: Andreas
full_name: Jentys, Andreas
last_name: Jentys
- first_name: Matthias
full_name: Bauer, Matthias
id: '47241'
last_name: Bauer
orcid: 0000-0002-9294-6076
- first_name: Wolfgang
full_name: Kleist, Wolfgang
last_name: Kleist
- first_name: Mirijam
full_name: Zobel, Mirijam
last_name: Zobel
citation:
ama: Prinz N, Schwensow L, Strübbe S, et al. Hard X-ray-based techniques for structural
investigations of CO2 methanation catalysts prepared by MOF decomposition. Nanoscale.
2020;12(29):15800-15813. doi:10.1039/d0nr01750g
apa: Prinz, N., Schwensow, L., Strübbe, S., Jentys, A., Bauer, M., Kleist, W., &
Zobel, M. (2020). Hard X-ray-based techniques for structural investigations of
CO2 methanation catalysts prepared by MOF decomposition. Nanoscale, 12(29),
15800–15813. https://doi.org/10.1039/d0nr01750g
bibtex: '@article{Prinz_Schwensow_Strübbe_Jentys_Bauer_Kleist_Zobel_2020, title={Hard
X-ray-based techniques for structural investigations of CO2 methanation catalysts
prepared by MOF decomposition}, volume={12}, DOI={10.1039/d0nr01750g},
number={29}, journal={Nanoscale}, publisher={Royal Society of Chemistry (RSC)},
author={Prinz, Nils and Schwensow, Leif and Strübbe, Sven and Jentys, Andreas
and Bauer, Matthias and Kleist, Wolfgang and Zobel, Mirijam}, year={2020}, pages={15800–15813}
}'
chicago: 'Prinz, Nils, Leif Schwensow, Sven Strübbe, Andreas Jentys, Matthias Bauer,
Wolfgang Kleist, and Mirijam Zobel. “Hard X-Ray-Based Techniques for Structural
Investigations of CO2 Methanation Catalysts Prepared by MOF Decomposition.” Nanoscale
12, no. 29 (2020): 15800–813. https://doi.org/10.1039/d0nr01750g.'
ieee: 'N. Prinz et al., “Hard X-ray-based techniques for structural investigations
of CO2 methanation catalysts prepared by MOF decomposition,” Nanoscale,
vol. 12, no. 29, pp. 15800–15813, 2020, doi: 10.1039/d0nr01750g.'
mla: Prinz, Nils, et al. “Hard X-Ray-Based Techniques for Structural Investigations
of CO2 Methanation Catalysts Prepared by MOF Decomposition.” Nanoscale,
vol. 12, no. 29, Royal Society of Chemistry (RSC), 2020, pp. 15800–13, doi:10.1039/d0nr01750g.
short: N. Prinz, L. Schwensow, S. Strübbe, A. Jentys, M. Bauer, W. Kleist, M. Zobel,
Nanoscale 12 (2020) 15800–15813.
date_created: 2023-01-30T17:47:17Z
date_updated: 2025-08-15T12:43:52Z
department:
- _id: '35'
- _id: '306'
doi: 10.1039/d0nr01750g
intvolume: ' 12'
issue: '29'
keyword:
- Xray
- Catalysis
language:
- iso: eng
page: 15800-15813
publication: Nanoscale
publication_identifier:
issn:
- 2040-3364
- 2040-3372
publication_status: published
publisher: Royal Society of Chemistry (RSC)
status: public
title: Hard X-ray-based techniques for structural investigations of CO2 methanation
catalysts prepared by MOF decomposition
type: journal_article
user_id: '48467'
volume: 12
year: '2020'
...