The inter-institutional MPG-consortium MAXNET Energy integrated the scientists from different institutions in Germany and abroad. As a result of close and fruitful collaboration within this framework, the scientists from Chemical Metal Science department at MPI CPfS together with experts from Fritz Haber Institute in Berlin and MPI CEC in Mülheim an der Ruhr, developed a new concept for producing multifunctionality in electrocatalysis and successfully illustrated it with an example of intermetallic compound Al2Pt as precursor for OER electrocatalyst material.
The transition from fossil fuels to renewable energy sources strongly depends on an availability of effective systems for energy conversion and storage.
Atomic QTAIM basins of platinum and aluminium (transparent) and Al-Pt bond basin (red) in the Al2Pt compound, revealing the pronounced charge transfer from Al to Pt atoms and polar character of Al-Pt atomic interactions.
© MPI CPfS
Long-term OER experiment in 0.1 M HClO4 with Al2Pt anode, expressed via series of linear sweep voltammetry curves, recorded after every 24h of chronopotentiometry at 90 mA cm-2. Inset: EDX spectrum image of the top 1.2 mm of the sample after the long-term experiment (cross section view; Al-rich domains in blue, Pt-enriched grains in red).
© MPI CPfS
Considering hydrogen as a carrier molecule, proton exchange membrane electrolysis offers numerous advantages, like operation at high current densities, low gas crossover, compact system design etc.
However, its wide implementation is hindered by slow kinetics of oxygen evolution reaction (OER), enhancement of which requires the application of low-abundant and expensive Ir-based electrocatalysts.
Looking for rational design of new types of OER electrocatalysts and addressing fundamental questions about the key reactions in energy conversion, the inter-institutional MPG-consortium MAXNET Energy integrated the scientists from different institutions in Germany and abroad.
As a result of close and fruitful collaboration within this framework, the scientists from Chemical Metal Science department at MPI CPfS together with experts from Fritz Haber Institute in Berlin and MPI CEC in Mülheim an der Ruhr, developed a new concept for producing multifunctionality in electrocatalysis and successfully illustrated it with an example of intermetallic compound Al2Pt as precursor for OER electrocatalyst material.
Intermetallic compound Al2Pt (anti-CaF2 type of crystal structure) combines two characteristics important for electrocatalytic performance: (i) reduced density of states at the Fermi level of Pt, and (ii) pronounced charge transfer from aluminium towards platinum, leading to strongly polar chemical bonding in this compound (Figure 1). These features provide inherent OER activity (Figure 2) and increasing stability against complete oxidation under harsh oxidative conditions of OER.
Upon OER conditions, Al2Pt undergoes restructuring in the near-surface region as a result of the self-controlled dissolution of aluminium (inset of Figure 2). The roughness and porosity of in situ-formed near-surface microstructure allow to compensate the specific activity loss. Even after exceptionally long stability experiment (19 days) at high current densities (90 mA cm-2) the bulk material retains its structural and compositional integrity.
Extending the choice of synthesis techniques, e.g. thin films growth, and exploring the variety of intermetallic compounds draw the main guidelines for future development of the proposed strategy.
The research at the Max Planck Institute for Chemical Physics of Solids (MPI CPfS) in Dresden aims to discover and understand new materials with unusual properties.
In close cooperation, chemists and physicists (including chemists working on synthesis, experimentalists and theoreticians) use the most modern tools and methods to examine how the chemical composition and arrangement of atoms, as well as external forces, affect the magnetic, electronic and chemical properties of the compounds.
New quantum materials, physical phenomena and materials for energy conversion are the result of this interdisciplinary collaboration.
The MPI CPfS (www.cpfs.mpg.de) is part of the Max Planck Society and was founded in 1995 in Dresden. It consists of around 280 employees, of which about 180 are scientists, including 70 doctoral students.
Iryna Antonyshyn, Yuri Grin
Iryna Antonyshyn, Ana M. Barrios Jiménez, Olga Sichevych, Ulrich Burkhardt, Igor Veremchuk, Marcus Schmidt, Alim Ormeci, Ioannis Spanos, Andrey Tarasov, Detre Teschner, Gerardo Algara-Siller, Robert Schlögl, Yuri Grin, Al2Pt for oxygen evolution reaction in water splitting: a strategy for creating multi-functionality in electrocatalysis, Angew. Chem. Int. Ed., accepted,
Dipl.-Übers. Ingrid Rothe | Max-Planck-Institut für Chemische Physik fester Stoffe
Study reveals how bacteria build essential carbon-fixing machinery
09.07.2020 | University of Liverpool
Stress testing 'coral in a box'
09.07.2020 | University of Konstanz
New insight into the spin behavior in an exotic state of matter puts us closer to next-generation spintronic devices
Aside from the deep understanding of the natural world that quantum physics theory offers, scientists worldwide are working tirelessly to bring forth a...
Kiel physics team observed extremely fast electronic changes in real time in a special material class
In physics, they are currently the subject of intensive research; in electronics, they could enable completely new functions. So-called topological materials...
Solar cells based on perovskite compounds could soon make electricity generation from sunlight even more efficient and cheaper. The laboratory efficiency of these perovskite solar cells already exceeds that of the well-known silicon solar cells. An international team led by Stefan Weber from the Max Planck Institute for Polymer Research (MPI-P) in Mainz has found microscopic structures in perovskite crystals that can guide the charge transport in the solar cell. Clever alignment of these "electron highways" could make perovskite solar cells even more powerful.
Solar cells convert sunlight into electricity. During this process, the electrons of the material inside the cell absorb the energy of the light....
Empa researchers have succeeded in applying aerogels to microelectronics: Aerogels based on cellulose nanofibers can effectively shield electromagnetic radiation over a wide frequency range – and they are unrivalled in terms of weight.
Electric motors and electronic devices generate electromagnetic fields that sometimes have to be shielded in order not to affect neighboring electronic...
A promising operating mode for the plasma of a future power plant has been developed at the ASDEX Upgrade fusion device at Max Planck Institute for Plasma...
07.07.2020 | Event News
02.07.2020 | Event News
19.05.2020 | Event News
09.07.2020 | Physics and Astronomy
09.07.2020 | Power and Electrical Engineering
09.07.2020 | Physics and Astronomy