Jobs
We welcome motivated students (Bachelor, Master) interested in nanomaterials for electrochemical energy conversion and storage.
We welcome applications for motivated "HiWis" in our projects.
We welcome motivated scholarship holders (PhD and PostDocs) to work with us.
- We invite you to scroll down!
- You can apply for a position listed below or send us an initiative application.
Please contact anna.fischer(a)ac.uni-freiburg.de for more information.
Please always include a CV and a motivation letter in your request, explaining why you want to do a PhD and why you are interested in the topic and in the group.
We are hiring!
PhD position
PhD Position (f/m/d), 36 months
The research group Inorganic Functional Materials and Nanomaterials, headed by Prof. Dr. Anna Fischer, is looking for a PhD candidate (f/m/d) for the “Design of 3D-Architectured Electrodes for Bioelectrocatalytic Nitrate Ammonification Cascades”.
Start-date at the earliest possible date.
About us:
The group of Inorganic Functional Materials and Nanomaterials develops nanostructured materials and interfaces for electrochemical energy conversion and storage systems. We are a diverse and international team of chemists and material scientists working on material synthesis, advanced characterization, and application for electrochemical energy systems. Our laboratories are located at the Institute for Inorganic and Analytical Chemistry (IAAC), the Freiburg Center for Material Research (FMF) as well as the Freiburg Center for Interactive Materials and Bioinspired Technology (FIT).
Project description / Your task:
The objective of the proposed project is to develop an enzyme-based bioelectrocatalytic nitrate ammonification system (also known as dissimilatory nitrate reduction to ammonium, DNRA) that quantitatively transforms nitrate into nitrite and further into ammonium, at first separately but ultimately in an integrated setting. For this, nitrate reductases and nitrite reductases will be coupled with tailored 3D-porous electrodes and integrated into advanced bioelectrochemical reactors to achieve high conversion rates. In the Einsle Lab (University of Freiburg) the enzymes will be engineered for high activity and stability as well as efficient electrode attachment (electrostatics, coordination, covalent binding). In the Fischer Lab (University of Freiburg) tailored 3D-porous electrode materials and electrodes will be developed and finetuned in terms of enzyme immobilization (adsorption and desorption studies in-situ spectroelectrochemical methods) and protein film voltammetry (direct versus mediated electron transfer). Finally, in the Apfel Lab (University of Bochum, Fraunhofer UMSICHT) high performance electrochemical zero-gap cells will be designed that allow for high current densities. Electrode integration will be realized with promising enzyme-electrode combinations that are evaluated for continuously operated single reactor reactions. Once the materials, immobilization strategies and reactor designs are optimized, integrated systems for enzymatic cascade reactions will be developed between all the partners.
Requirements:
- You have a Master degree in chemistry, physical chemistry, biochemistry, material science or engineering.
- You have expertise in the synthesis and/or processing of nanomaterials, in-depth knowledge in materials characterization techniques, enzymatic systems, spectroscopy as well as electrochemistry. Previous experience in the field of bioelectrocatalysis is a plus but not mandatory.
- Team-working capabilities, as well as excellent organization, communication and writing skills in English and/or German are required.
Location/supervision:
The candidate will work at the University of Freiburg.
The PhD project will be supervised by Prof. Dr. Anna Fischer.
Application:
Please send your application in one single PDF file via email to the email address stated below including:
- a CV
- a short (max 3 pages) research summary about previous research experiences
- a motivation letter (why do you want to do a PhD and why in the Fischer Lab?)
- an overview of the lectures in your studies
- a copy of your diploma
- and the contact of 2 references
Deadline: 31.03.2024
E-mail: bewerbung@ac.uni-freiburg.de
PhD positions
Open PhD position in the field of sodium ion batteries to come!
Open PhD position in the field of fuel cells to come!
Please contact anna.fischer(a)ac.uni-freiburg.de for more information.
Please always include a CV and a motivation letter in your request, explaining why you want to do a PhD and why you are interested in the topic and in the group.
Student research assistants (HiWi)
Open student research assistant position - We are hiring!
HiWi 1 - Optimization of gold nanoparticle arrays for nanostructured electrets
Tasks and goals: The project NanoTret (livMatS excellence cluster) is about the development of nano-/ micro‑structured permanently charged surfaces for electrostatic mechanical energy harvesters. Your task will be to make electrets based on isolated gold nanoparticles. After the deposition by spin‑coating, you will also do the charging of the electret with a corona discharge or a tunneling current.
The goal of your work will be to optimize the fabrication of the hexagonally structured gold nanoparticles. This includes the improvement of the size distribution and alignment of the nanoparticles. Through your work, you will get a complex understanding of a very versatile method for patterning a surface. Furthermore, you will learn the basics of working with silicon chips and gain insights into several interesting techniques like scanning electron microscopy.
Expectations: It would be desirable that you have a basic knowledge of lab work. Further, it would be great if you would consider yourself as a careful and clean worker because in the area of nanoparticles dirt can be terrible. That is all I am expecting of you, apart from being motivated.
Orga: HiWi positions are remunerated according to the usual rates and working hours can be arranged flexibly by arrangement.
Start: Immediately.
For more details contact niklas.maier@livmats.uni-freiburg.de with cc anna.fischer@ac.uni-freiburg.de
Please send a short motivation letter (half page) and your CV to the above-mentioned e-mail addresses. We are looking forward to your application!
HiWi 2 - Synthesis of mesoporous carbons as support materials for catalysts
Tasks and goals: The aim of this work is the scaled synthesis and characterization of different carbon materials for electrochemical applications. Mesoporous nitrogen-doped carbon (MPNC) with controlled properties will be synthesized by hard templating. Further post-treatment is performed to refine the physicochemical properties of the carbon. The characterization of the produced particles is then performed by elemental analysis, X-ray diffraction, Raman spectroscopy, electron microscopy and gas adsorption.
Expectations: After a detailed introduction, independent work with proactive thinking and high accuracy and motivation is expected. Practiced and confident working in the lab is necessary, synthesis experience is desirable. English or German speaking Students from the fields of chemistry and materials science are welcome.
Orga: HiWi positions are remunerated according to the usual rates and working hours can be arranged flexibly by arrangement.
Start: Immediately.
For more details contact sven.kuespert@fmf.uni-freiburg.de , niklas.ortlieb@ac.uni-freiburg.de and cc anna.fischer@ac.uni-freiburg.de
Please send a short motivation letter (half page) and your CV to the above-mentioned e-mail addresses. We are looking forward to your application!
HiWi 3 - MAX and MXene from molten metals and molten salts
Tasks and goals: The project aims at optimization of the synthesis procedure of two-dimensional MXenes from the Mn+1AXn, where M denotes a transition metal, A is an element such as aluminum or silicon, and X is either carbon or nitrogen. Obtained few-atoms-thick layers will be used for the preparation of electrodes using advanced deposition techniques such as, doctor-blade coating, spray coating or 3D printing. The electrochemical performance of the produced electrodes will be investigated for the supercapacitor and battery systems.
You will acquire experience in synthesis of MAX and MXenes, their processing, electrochemical characterization and implementation into functional devices.
Expectations: we are looking for a motivated candidate from the field of chemistry or material science. Knowledge in electrochemistry and/or experience in synthesis is a plus.
Orga: HiWi positions are remunerated according to the usual rates and working hours can be arranged flexibly by arrangement.
Start: Immediately.
For more details contact anna.fischer@ac.uni-freiburg.de
Please send a short motivation letter (half page) and your CV to the above-mentioned e-mail addresses. We are looking forward to your application!
HiWi 4 - Advanced Materials and Electrodes for the Development of Energy Storage Devices
Tasks and goals: The project aims at the optimization of the synthesis procedure for MoSx-decorated mesoporous carbon nanostructures. With a special focus on morphology and physicochemical property control, the obtained materials will be fine-tuned for electrochemical supercapacitors and batteries. The obtained carbons will be used for the preparation of electrodes using advanced deposition techniques such as doctor-blade coating, spray coating or 3D printing. The electrochemical performance of the produced electrodes will be investigated for electrochemical pseudocapacitor and Lithiom-ion battery systems.
You will acquire experience in the synthesis of carbon nanomaterials, their processing, electrochemical characterization and implementation into functional devices.
Expectations: We are looking for a motivated candidate from the field of chemistry or material science. Knowledge in electrochemistry and/or experience in synthesis is a plus.
Orga: HiWi positions are remunerated according to the usual rates and working hours can be arranged flexibly by arrangement.
Start: Immediately.
For more details contact anna.fischer@ac.uni-freiburg.de
Please send a short motivation letter (half page) and your CV to the above-mentioned e-mail addresses. We are looking forward to your application!
HiWi 5 - Li - Ion battery based Photobatteries
Tasks and goals: Our battery research in the DFG Excellence Cluster livMatS focuses on Cathode and Anode Materials for photo rechargeable Li-Ion Battery Systems. You will build Li-Ion Batteries in Coin Cells and Swagelok T-Cell in half cell and full cell setups. Further the preparation of electrode slurries and their casting via doctor blading will be part of your work. The electrochemical characterization will be done with standard measurement protocols and the techniques include Galvanostatic Charge Discharge, Cyclic Voltammetry and Electrochemical Impedance Spectroscopy. You will learn all relevant lab techniques in preparing electrode slurries and electrodes for Li-Ion-Battery Anode and Cathodes. You will learn how to build different lab scale characterization setups for Li-Ion Batteries such as Coin Cells and Swagelok T-Cells and how to characterize Li-Ion Battery half cells and full cells electrochemically. All of the techniques used are scalable to industrial levels and actually used in nowadays battery production processes.
Expectations: We are looking for a motivated student from the field of chemistry or material science (a Bachelor or Master is not needed but of course welcome). Knowledge in electrochemistry and/or experience in synthesis is a plus.
Orga: The contract will have between 30 and 40 hours per month. The salary depends on the working hours per month and whether you already have a bachelor degree or not, but will be between 370 and 450 € per month.
Start: Immediately.
For more details contact anna.fischer@ac.uni-freiburg.de
Please send a short motivation letter (half page) and your CV to the above-mentioned e-mail addresses. We are looking forward to your application!
Master or bachelor thesis topics
- Open Master/Bachelor-Thesis Topics:
We are always searching for master/bachelor candidates to work on one of the following topics:
a) Synthesis, characterization and application of nanostructured photoanodes for water oxidation and beyond
b) Synthesis, characterization and application of nanostructured ORR electrocatalysts for heavy duty fuel cells
c) Synthesis, characterization and application of nanostructured N2 reduction electrocatalysts
d) Synthesis, characterization and application of nanostructured CO2 reduction electrocatalysts
e) Synthesis, characterization and application of nanostructured electrodes for enzyme electrocatalysis
f) Synthesis, characterization and application of nanostructured electrets
g) Synthesis, characterization and application of battery materials (LIB, NIB and ZIB)
Applications should be send to anna.fischer@ac.uni-freiburg.de
Specific master topics:
Background:
Currently, the most active catalysts for the proton exchange membrane fuel cell (PEMFC) are expensive platinum-based materials (Pt/C). The expensive platinum as well as the high cost of acid-stable fuel cell components are still one of the biggest problems. An alternative to the PEMFC is the anion exchange membrane fuel cell (AEMFC), which is again the subject of current research due to the development of new stable and high-performance AEM membranes.
The alkaline conditions of an AEMFC (pH 13) opens the possibilities for new precious metal-free catalysts with high activity and stability. Among these new materials, Fe-based single atom materials are the most promising cathode catalysts since they are highly active and stable for the oxygen reduction.
Tasks and Goals:
The aim of this work is the synthesis of different macro-, meso-, and microporous Fe-Zn-N-C catalysts for alkaline oxygen reduction by hard-templating. By optimizing the pore size and pore percolation, the accessibility of the single-atomic Fe-Nx sites should be maximized to prevent mass transfer limitations in the aqueous electrolyte as well as later in the fuel cell. Further physicochemical characterization will be performed by elemental analysis, X-ray diffraction, Raman spectroscopy, electron microscopy and gas physisorption.
What we expect:
After a detailed introduction, independent work with proactive thinking and high accuracy and motivation is expected. Practiced and confident working in the lab is necessary, synthesis experience is desirable. English or German speaking students from the fields of chemistry and materials science are welcome.
What we offer:
- Modern synthesis of sustainable nanostructured materials
- Training in a wide range of analytical methods for material characterization
- Multicultural team with a lot of support and a pleasant working atmosphere
- Flexible working time
Applications should be send to anna.fischer@ac.uni-freiburg.de and patrick.elsaesser@ac.uni-freiburg.de
2) Electrochemical stability studies of precious metal-free catalysts as cathode catalysts for alkaline oxygen reduction
PDF Download with more information on demand.
Background:
Currently, the most active precious metal-free cathode catalysts for the oxygen reduction reaction in an anion exchange membrane fuel cell (AEMFC) are catalysts with molecular Fe-Nx sites. However, the stability of these molecular sites is currently being intensively discussed and investigated. In particular, the influence of oxygen on the aging of such materials has only been little researched so far, since most standardized measurement protocols are performed in Ar or N2 atmosphere.
Therefore, to study the influence of oxygen on stability, new protocols for electrochemical measurements in aqueous electrolytes are necessary.
Tasks and Goals:
The aim of this work is to investigate the influence of pyrolysis temperature on the catalytic stability of Fe-Zn-N-C catalysts for the alkaline oxygen reduction. The stability under simulated load-cycling as well as under simulated start-stop conditions in Ar- and O2-saturated electrolytes will be investigated, and the changes in the number of catalytically active Fe-Nx centers will be determined by electrochemical quantification. The physicochemical characterization of the produced catalysts is further performed by, X-ray diffraction, electron microscopy and gas physisorption.
What we expect:
After a detailed introduction, independent work with proactive thinking and high accuracy and motivation is expected. Practiced and confident working in the lab is necessary, experience in electrochemistry is desirable. English or German speaking students from the fields of chemistry and materials science as well as from the field of engineering are welcome.
What we offer:
- Modern electrochemical characterization methods
- Training in a wide range of analytical methods for material characterization
- Multicultural team with a lot of support and a pleasant working atmosphere
- Flexible working times
Applications should be send to anna.fischer@ac.uni-freiburg.de and patrick.elsaesser@ac.uni-freiburg.de