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Nilsen, Ola
(2023).
MLD as a Sandbox for Photoactive Hybrid Materials.
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Dahl, Øystein; Sunding, Martin Fleissner; Thøgersen, Annett; Killi, Veronica Anne-Line Kathrine; Svenum, Ingeborg-Helene & Grandcolas, Mathieu
[Vis alle 10 forfattere av denne artikkelen]
(2023).
Direct observation of interfacial energetics at Ta3N5/electrolyte and Ta3N5/NiOx/electrolyte heterojunctions by operando ambient pressure X-ray photoelectron spectroscopy during photoelectrochemical water splitting.
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Dahl, Øystein; Sunding, Martin Fleissner; Thøgersen, Annett; Killi, Veronica Anne-Line Kathrine; Svenum, Ingeborg-Helene & Grandcolas, Mathieu
[Vis alle 10 forfattere av denne artikkelen]
(2023).
Operando observation of interfacial energetics at the Ta3N5/electrolyte heterojunction by ambient pressure X-ray photoelectron spectroscopy for photoelectrochemical water splitting .
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Skare, Marte Orderud; Ulvestad, Asbjørn; Mæhlen, Jan Petter; Nilsen, Ola & Koposov, Alexey
(2022).
Accelerating the development of new silicon-based anode materials.
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Killi, Veronica Anne-Line Kathrine; Thøgersen, Annett; Cavallo, Carmen; Das, Supti; Koposov, Alexey & Nilsen, Ola
(2021).
Coating of powder by ALD.
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Fjellvåg, Øystein; Sønsteby, Henrik Hovde; Nilsen, Ola; Wolff, Max; Kapaklis, Vassilios & Fjellvåg, Helmer
[Vis alle 8 forfattere av denne artikkelen]
(2020).
Towards Multiferroic Thin Film Composites by Atomic Layer Deposition (ALD)
.
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Kvamme, Kristian Breivik; Ruud, Amund; Weibye, Kristian & Nilsen, Ola
(2019).
Phosphites as precursors in thin film synthesis. Using LiPO as cathode coating in Li-ion batteries.
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Kvamme, Kristian Breivik; Ruud, Amund; Weibye, Kristian & Nilsen, Ola
(2019).
Phosphites as precursors in thin film synthesis. Using LiPO as cathode coating in Li-ion batteries.
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de Koning, Martijn; Gorzkowska-Sobas, Agnieszka A; Lausund, Kristian Blindheim; Petrovic, Veljko; Nilsen, Ola & Smith, Martin W.
(2019).
Thin layers of UiO-66-NH2 and their catalytic activity towards selected chemical warfare agents.
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Gorzkowska-Sobas, Agnieszka A; Lausund, Kristian Blindheim; Petrovic, Veljko; de Koning, Martijn; Chavan, Sachin Maruti & Smith, Martin W.
(2019).
Ammonia adsorption in metal-organic framework materials MLD-deposited on functional substrate for respiratory protection purposes.
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Koposov, Alexey; Gandrud, Knut Bjarne; Lai, Samson Yuxiu; Jensen, Ingvild Julie Thue; Nagell, Marius Uv & Nilsen, Ola
(2019).
Silicon on the Road.
Vis sammendrag
IFE together with the UiO, University of Tours (France) and SINTEF recently started a new project “Silicon-on-the-Road”, with the primary aim to develop new silicon-based anode materials for lithium ion batteries. Stabilizing the surfaces of silicon particles has proven to be the most challenging step in the development of high capacity silicon-based electrodes. One of the objectives is therefore to create a material that than can coat the active particles and deliver structural integrity for the anode while keeping all the attractive properties of silicon. The project encompasses a range of coating and analyses methodologies. The current presentation will focus on results obtained using one of the more versatile methods; Atomic Layer Deposition (ALD) and our recent results on thin-film electrodes of amorphous Si as model systems for coating development. This project is co-funded by Norwegian industry and the Research Counsil of Norway through the EnergiX program.
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Hval, Halvor Høen; Tripathi, Alok Mani; Ruud, Amund; Emerich, Hermann; Forseth, Sissel & Nilsen, Ola
(2019).
Make Batteries Safe Again.
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Brennhagen, Anders; Kvamme, Kristian Breivik; Sverdlilje, Katja S. S. & Nilsen, Ola
(2019).
Amorphous Iron Phosphates for Thin Film batteries.
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Brennhagen, Anders & Nilsen, Ola
(2019).
Forskningstorget 2019 - Batteriproduksjon på stand.
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Chavan, Sachin Maruti; Gorzkowska-Sobas, Agnieszka A; de Koning, Martijn; Lausund, Kristian Blindheim; Petrovic, Veljko & Nilsen, Ola
(2019).
Towards adsorptive and catalytically active materials using an all-gas-phase UiO-66-NH2 synthesis approach.
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Nitsche Kvalvik, Julie; Hansen, Per-Anders Stensby & Nilsen, Ola
(2019).
Area-selective deposition of MoO3 thin films by atomic layer deposition.
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Hval, Halvor Høen; Ruud, Amund; Forseth, Sissel; Emerich, Hermann; Nilsen, Ola & Fjellvåg, Helmer
(2019).
Operando investigation of batteries.
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Hval, Halvor Høen; Tripathi, Alok Mani; Ruud, Amund; Emerich, Hermann; Forseth, Sissel & Nilsen, Ola
(2019).
Make Batteries Safe Again.
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Dziadkowiec, Joanna; Zareeipolgardani, Bahareh; Bratvold, Jon E.; Nilsen, Ola; Dysthe, Dag Kristian & Røyne, Anja
(2019).
Long-range repulsive forces between reactive calcite surfaces are generated due to nucleation in a confined solution.
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Hansen, Per-Anders Stensby; Zikmund, Tomas; Yu, Ting; Nitsche Kvalvik, Julie; Aarholt, Thomas & Prytz, Øystein
[Vis alle 8 forfattere av denne artikkelen]
(2018).
Aromatic-fluoride nanocomposite materials by atomic layer deposition.
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Hansen, Per-Anders Stensby; Meijerink, Andries & Nilsen, Ola
(2018).
Strong TiO2 sensitization of Tb3+ by preventing Ti-Tb charge transfer quenching in subnanometer multilayer structures.
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Hansen, Per-Anders Stensby; Nesteng, Hanne; Svendsen, Ole Joachim & Nilsen, Ola
(2018).
Blue, green and red emitting lanthanide-organic hybrid films excitable with long wavelength UV.
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Hval, Halvor Høen; Ruud, Amund; Forseth, Sissel; Emerich, Hermann; Nilsen, Ola & Fjellvåg, Helmer
(2018).
Operando investigation of batteries.
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Hval, Halvor Høen; Ruud, Amund; Forseth, Sissel; Emerich, Hermann; Nilsen, Ola & Fjellvåg, Helmer
(2018).
Operando investigation of batteries.
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Dziadkowiec, Joanna; Javadi, Shaghayegh; Bratvold, Jon E.; Nilsen, Ola & Røyne, Anja
(2018).
Nucleation in solution confined between
reactive surfaces can generate long-range
repulsive forces.
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Dziadkowiec, Joanna; Javadi, Shaghayegh; Bratvold, Jon E.; Nilsen, Ola & Røyne, Anja
(2018).
Adhesive and repulsive forces between calcite surfaces.
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Kjeldstad, Torunn; Thøgersen, Annett; Galeckas, Augustinas; Monakhov, Eduard; Stange, Marit Synnøve Sæverud & Nilsen, Ola
(2018).
Aluminum nanowires in amorphous silicon.
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Thøgersen, Annett; Stange, Marit Synnøve Sæverud; Galeckas, Augustinas; Nilsen, Ola & Monakhov, Eduard
(2018).
Aluminum nanowires in amorphous silicon.
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Kvamme, Kristian Breivik; Sverdlilje, Katja Sofie Støren & Nilsen, Ola
(2018).
Thin film batteries at UiO
.
Vis sammendrag
Batteries are fast becoming the go-to energy storage solution of our future, even for highly demanding applications such as aviation. The growing expectations and demands for our future batteries require radical improvements in both design and construction. Several approaches are being pursued throughout the research community. At UiO, we are exploring solid-state electrolytes to fulfil these demands. Changing from a liquid to a solid electrolyte is a drastic change in battery design, and solid electrolytes will significantly improve the properties of batteries. This will in turn enable new applications and further decouple our civilization from fossil fuels. Most solid materials have low ionic conductivity, but not all. We are exploring solid materials with high ionic conductivity, including combinations of organic and inorganic structures forming a class of hybrid materials. This work is based on our previous, successful work on high-performance FePO4 cathode materials that show quasi-capacitive behaviour.
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Javadi, Shaghayegh; Dziadkowiec, Joanna; Røyne, Anja; Bratvold, Jon E.; Nilsen, Ola & Hiorth, Aksel
(2018).
Synthetic CaCO3 surfaces in aqueous solutions – AFM and Surface Force Apparatus (SFA) measurements
.
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Skottvoll, Frøydis Sved; Nilsen, Ola; Krauss, Stefan; Sullivan, Gareth & Wilson, Steven Ray Haakon
(2018).
Integrating highly miniaturized LC-MS systems with “Organ on a Chip”; the future of preclinical modelling
.
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Kvamme, Kristian Breivik; Ruud, Amund; Weibye, Kristian & Nilsen, Ola
(2017).
LiPO barriers by ALD
Surface modification of LiFePO4 cathodes
.
Vis sammendrag
Lithium phosphate (Li3PO4) is a promising material as solid state electrolyte. In this work a new
route for synthesis of phosphorous based materials using Atomic layer deposition (ALD) is
demonstrated. The established phosphate precursor for ALD use has been replaced by the more
volatile phosphite precursors for synthesis of LiPO and AlPO materials. Furthermore, the LiPO
product has been tested as a barrier material onto LiFePO4 cathodes to improve kinetics and
cycling performance. We have shown that there is indeed an improvement at low barrier
thicknesses Figure 1. Adding barrier layers in the interphase between the cathode and electrolyte
can be seen as a step on towards development and implementation of commercially viable solid
state electrolytes. Deposition of barriers for battery materials by ALD is not a new field [1].
Films of; AlPO4, FePO4 [2], Al2O3 [3, 4], TiO2 [5], Li3PO4 [5] and LiPON [6] have all been
reported. Our novel approach is application of phosphorous precursors in the +III oxidation state,
such as trimethyl phosphite (Me3PO3) and triethyl phosphite (Et3PO3). These precursors can
replace trimethyl phosphate (Me3PO4) in established deposition routes for aluminium phosphate
(AlPO4) [7] and lithium phosphate (Li3PO4) [8, 9] by ALD. Furthermore, the resulting LixPO3
product can form a barrier layer where certain thicknesses will give a positive contribution to
kinetics, capacity retention and cycling performance.
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Lausund, Kristian Blindheim & Nilsen, Ola
(2017).
Crystallization of hybrid films to form the metal-organic framework UiO-66
.
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Kjeldstad, Torunn; Galeckas, Augustinas; Nilsen, Ola; Azarov, Alexander; Stange, Marit Synnøve Sæverud & Diplas, Spyridon
[Vis alle 7 forfattere av denne artikkelen]
(2017).
Self-assembly of Al-nanowires in silicon.
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Thøgersen, Annett; Kjeldstad, Torunn; Jensen, Ingvild Julie Thue; Muntingh, Agnar Georg Peder; Stange, Marit Synnøve Sæverud & Ulyashin, Alexander
[Vis alle 9 forfattere av denne artikkelen]
(2017).
Plasmonic properties of aluminium nanowires in amorphous silicon and inverted silicon nanowires.
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Thøgersen, Annett; Kjeldstad, Torunn; Jensen, Ingvild Julie Thue; Stange, Marit Synnøve Sæverud; Ulyashin, Alexander & Galeckas, Augustinas
[Vis alle 9 forfattere av denne artikkelen]
(2017).
Growing and characterizing self-organizing aluminium nanowires in amorphous silicon.
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Nilsen, Ola; Gandrud, Knut Bjarne; Ruud, Amund & Fjellvåg, Helmer
(2017).
Atomic Layer Deposition for Thin-Film Lithium-Ion Batteries.
I Bachmann, Julien (Red.),
Atomic Layer Deposition in Energy Conversion Applications.
Wiley-VCH.
ISSN 9783527339129.
s. 183–207.
doi:
10.1002/9783527694822.ch6.
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North, Erlend Tiberg; Nilsen, Ola & Hansen, Per-Anders Stensby
(2022).
Quinizarin as Organic Sensitizer in LnF3 Thin Films for Photon Upconversion.
Universitetet i Oslo.
Vis sammendrag
This thesis illuminates the opportunities for Quinizarin (Qz) as an organic sensitizer in LnF3 (Ln=Y, Nd, Tm, Yb) thin films for upconversion. Lanthanides show great promise as active materials for upconversion technologies, but struggle with very low absorption and thus, very low efficiency. We attempt to correct this by including a broad band absorber, in our case an organic dye. Atomic layer deposition (ALD) has been used to build the multilayered structures with control of the interatomic separations. The project has been divided into multiple parts, focusing first on Qz as sensitizer and its properties in solid state by ALD growth of Ln2Qz3. The ALD growth of LnF3 thin films was investigated and multilayered structures intended to show upconversion was made. Initial investigations of Qz show that as a dispersed molecule, its luminescence is heavily influenced by its environment, but indicates it could function as a sensitizer. When combined with Ln(thd)3 as a precursor in ALD growth, it shows exceptionally good growth with high growth rate, as well as high optical absorption. The growth and structure of LnF3 thin films using NH4F as fluorine source has been characterized using quartz crystal microbalance (QCM), with results indicating similar type of growth among all the tested lanthanides, apart for Nd, which proved more challenging. Uniform film with growth rates of around 0.6 Å/cycle were achieved, and NH4F has been proven a good fluorine source in LnF3 systems using Ln(thd)3. Qz has been successfully incorporated into these films with high absorption for high Qz-content, as characterized by using ultraviolet, visible and near infrared spectroscopy (UV-Vis). However, the films were not luminescent, as aimed for, proving that there is more work to be done to understand the quenching mechanisms involved. The upconversion structure itself has been investigated by growing and investigating multilayers of YbF3 with Nd3+ and Tm3+. Using cathodoluminescence (CL) both ions have been shown incorporated in the structure. The system shows different emission intensities depending on ion distance, with 0.8 nm being the most optimal for CL signal.
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Skottvoll, Frøydis Sved; Wilson, Steven Ray Haakon & Nilsen, Ola
(2022).
Liver organoids, mass spectrometry and separation science.
Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Oslo.
ISSN 1501-7710.
2022(2493).
Vis sammendrag
Organoids are predicted to change the future of medicine by acting as an in vitro 3D representation of human organ functionality. Organoids are grown from patient derived stem cells or adult tissue, which promise to enable new and faster drug discovery, disease modeling and personalized medicine under more realistic conditions. Organoids are still at the developmental stage and fundamental questions concerning the functionality of the developed organoids remain to be answered. Compared to other biosampling techniques, mass spectrometry (MS) has rarely been used in organoid analyses. This thesis leverages MS and separation science to analyze the biological properties of liver organoids, spanning from protein identification to small molecule drug metabolite detection. With the aim of developing selective, high throughput analyses and online biosampling integration, both conventional and cutting edge electromembrane extraction (EME) sample preparation approaches were explored.
Using bioanalytical tools including MS and separation science, we could establish that the liver organoids displayed liver organ functionality. The bioanalytical strategies we developed for liver organoid analyses contribute to greater insight into organoid response and functionality and could be important tools in future organoid development. Furthermore, online organoid integration using electromembrane extraction developed here could be used as a starting point towards developing future organ-on-a-chip systems integrated with mass spectrometry, which would be valuable in drug development, disease modeling, and personalized medicine.
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Kvalvik, Julie Nitsche; Nilsen, Ola & Hansen, Per-Anders Stensby
(2021).
Design and deposition of CaMoO4 as host for solar down - converters.
Universitetet i Oslo, Det matematisk-naturvitenskapelige fakultet.
ISSN 1501-7710.
2021(2398).
Vis sammendrag
Silicon solar cells are approaching their maximum theoretical efficiency. They can still be improved by adapting the sunlight using a pair of light-scissors as down-converters. Such scissors cuts the light into energy packets better suited for the silicon solar cell. Popular down-converters are based on pairs of lanthanides carefully distributed in an absorbing host material. However, synthesizing such materials is challenging. For the process to be efficient, the distance between the lanthanides must be carefully controlled within a nanometer and too much of the lanthanides will also reduce the efficiency.
In the current work we have explored CaMoO4 doped with Pr3+/Yb3+ as a down-converter, using atomic layer deposition (ALD) as the synthesis tool. ALD allows spatial control of the lanthanide dopants, but combining binary ALD-processes to make complex oxides, requires many parameters to be tuned. To ease the tuning, Design of Experiments (DoE) has been used. A new compatible process for deposition of MoOx had to be developed to achieve the goal. As serendipity, this process also showed an area-selective behaviour, which is very rare to observe (Figure 1). Finally, CaMoO4: Pr3+ / Yb3+ was successfully synthesized, and we found that we could use ALD to control its optical properties.
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Sørensen, Silje Holm; Nilsen, Ola & Hansen, Per-Anders Stensby
(2020).
Organic Sensitization in Lanthanide Fluoride Nanostructures for Upconversion.
Universitetet i Oslo.
Vis sammendrag
The objective of this thesis is to make organic sensitized upconversion thin films for application on photovoltaic and photocatalytic devices. Upconversion is a light conversion process where two photons of low energy come together to form one photon of higher energy. Using this technique, the light from the sun can be modified to correlate with the bandgaps of for example solar cells. This could potentially increase the efficiencies of the devices drastically. To ensure an efficient upconversion process, organic dyes can be implemented into the system. Organic dyes are good absorbers and can therefore work as sensitizers, increasing the efficiencies of the upconversion process. We have explored how molecular layer deposition (MLD) can be used to synthesize thin films of such upconversion structures. The work in this project has been twofold with one part focusing on implementation of organic dyes into thin films using MLD and the second part aiming to make an upconversion system. During the first part of the project, we proved that the sublimation temperatures of perylenes, a group of large organic dyes are highly dependent on their intramolecular forces. We identified that the perylene FA5 with a molecular mass of 985.12 g/mol still is suitable as a precursor for MLD growth despite its large molecular mass. This is a significant expansion in use of heavy molecules for MLD, as compared to prior experience. Furthermore, perylenes have successfully been implemented into thin films using β-diketonates Ln(thd)3as cation precursors. The perylene based films have been made both with and without using the amino acid glycine as a linker between the Ln and the perylene. The films containing glycine have remarkably higher growth ratesthan thosewithout, due to formation of a Ln-Glycine phase during growth. The growth dynamics have been explored by quartz crystal microbalance (QCM) and the optical properties by UV-Vis, showing stronger absorbing properties in the films deposited without linker.All perylene based films formed structuresclose to the stoichiometryLn2Perylene3.
The upconversion properties were explored through depositions of lanthanide-fluoride thin films with Tm3+and Nd3+doped in an YbF3matrix. Both dopants were successfully implemented as both Tm3+and Nd3+ luminescence can be seen from cathodoluminescence (CL) measurements,indicating promising luminescent properties. Growth of YbF3 was explored using NH4F as the chosen fluoride precursor and Yb(thd)3 as Yb precursor. We obtained growth rates of approximately 0.2 Å/cycle with good reproducibility, making it a good system.
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Brennhagen, Anders; Nilsen, Ola; Kvamme, Kristian Breivik & Sverdlilje, Katja S. S.
(2019).
Synthesis and electrochemical characterization of thin film iron phosphates as cathode material for Li-ion batteries.
Universitetet i Oslo.
Vis sammendrag
Solid-state batteries is one of the main contenders for domination of the future battery marked. Thin film technology is important in the development of these batteries. In this work, we have shown that amorphous thin film FePO4 with a thickness around 10 nm, deposited by atomic layer deposition (ALD), can reach a specific power above 1 MW/kg and approach theoretical capacity at lower currents. The 10 nm thin film also shows very good cycling stability at elevated currents and can retain 70 % of peak capacity after 8000 cycles at 80 µA (40C). The material also shows a significant self-enhancing mechanism leading to an increase in capacity during early cycling stages. We observed a capacity increase of 90 % for 10 nm after 100 cycles at 80 µA. In this study, we used quartz crystal microbalance (QCM) analysis to establish a stable ALD process for depositing amorphous thin films from the Fe-P-O system. By varying the pulsing ratio between the precursors, we obtained films with different compositions and chose to study Fe4(P2O7)3 and FePO4 more in detail. The films were uniform and flat with an RMS roughness below 1 nm. As the FePO4 films proved to be significantly better than the Fe4(P2O7)3, we focused mainly on FePO4. We used galvanostatic cycling (GC), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) to characterize the electrochemical properties of the thin films. An important part of this study was to develop a good baseline for testing, including the use of reference batteries. In this work, we confirmed that LiClO4 is a better choice than LiPF6 as electrolyte for testing thin film cathodes, because of minimal side reactions with the steel casing. The FePO4 thin films show a combination of capacitive and redox behavior where both contribute to the capacity. In this study, we have tried to separate the two contributions and find their thickness and current dependency. In an attempt to increase the area capacity of the cathodes without increasing the film thickness, we created soot substrates with high surface 3D structures of carbon, deposited from the flames of a candle. We managed to maintain the structure and evenly coat it with FePO4. Despite the increase in mass, we obtained no higher capacity or better battery performance from the soot batteries.
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