It helps to directly ascertain the potential of a possible alloy. The team reports in the journal Angewandte Chemie International Edition on 22 December 2019.
Efficient catalysts made from inexpensive and available elements
The researchers' hopes with regard to new catalysts made from inexpensive and available elements rest on what are known as complex solid solutions, also called high-entropy alloys. They consist of five or more elements that are homogeneously mixed and the diverse, complex interactions of which enable fine adjustments of the relevant properties. Importantly, it is not only the properties of the individual elements that are crucial but above all their interaction. "This opens up a wide range of otherwise unachievable possibilities in order to simultaneously optimise price and performance for possible applications," says Professor Wolfgang Schuhmann from the Center for Electrochemical Sciences at RUB.
However, fundamental knowledge about the recently discovered new catalyst class is still lacking. What information could be provided by measurements in order to make targeted advances in catalyst development? How does this help find the right one among the almost infinite possible combinations? What effect does replacing an element have on the properties?
Interpreting results more accurately
"We have developed a concept that enables us to understand the correlations between the selection of the elements, theoretical, activity-defining properties, and actually measurable parameters," reports Tobias Löffler, a doctoral candidate in electrochemistry. As the complex solid solutions differ from conventional electrocatalysts in all these points, this understanding is fundamental for experimental progress.
The researchers are thus faced with the challenge that not only the combination of elements but also the proportion of each element is crucial and any deviations change the properties. "We show how experiments with an alloy made from, for instance, five equal parts of each element can be interpreted in order to identify the element combination as potentially active," explains Tobias Löffler. The researchers are thus able to identify quickly whether it is worthwhile optimising the proportions of the elements. "This enables us to reduce the screening workload for possible material compositions to a fraction without overlooking promising candidates," explains Wolfgang Schuhmann. Without this knowledge, it is possible that combinations could be filtered out using conventional evaluations even though these could be highly interesting if the element ratios were optimised. "What's more, this concept forms a cornerstone in understanding the complex mode of action of this material class, which helps to better understand the possible parameters that can be adjusted and thus derive promising design concepts from this."
The researchers tested these conceptual considerations with selected alloys using the oxygen reduction reaction relevant to fuel cells. They were able to demonstrate in which cases replacing or adding an element to an existing element combination has a positive effect and vice versa. They were also able to identify combinations that are suitable for further optimisation.
"For material synthesis, this means an immense saving in time and money," says Professor Alfred Ludwig, Chair for Materials Discovery and Interfaces at RUB. "Producing and analysing all of the possible element ratios of an alloy consisting of five elements is a huge challenge. By eliminating elementary hurdles, we hope to further facilitate access to this highly topical and technological relevant field and encourage more researchers to contribute with their respective skills."
The work was funded by the German Federal Ministry of Education and Research in the project Nemezu (03SF0497B) and the German Research Foundation in the cluster of excellence Ruhr Explores Solvation Resolv EXC 2033 - project number 390677874 and the projects LU1175/23-1, LU1175/22-1 and LU1175/26-1. Support was also provided by the Fund from the Chemicals Industry and the Max Planck Research School for Interface Controlled Materials for Energy Conversion IMPRS Surmat.
Tobias Löffler, Alan Savan, Hajo Meyer, Michael Meischein, Valerie Strotkötter, Alfred Ludwig, Wolfgang Schuhmann: Design of complex solid solution electrocatalysts by correlating configuration, adsorption energy distribution patterns and activity curves, in: Angewandte Chemie International Edition, 2019, DOI: 10.1002/ange.201914666, https:/
Prof. Dr. Wolfgang Schuhmann
Analytical Chemistry - Center for Electrochemical Sciences (CES)
Faculty of Chemistry and Biochemistry
Phone: +49 234 32 26200
Prof. Dr. Alfred Ludwig
Materials Discovery and Interfaces
Institute for Material
Faculty of Mechanical Engineering
Phone: +49 234 32 27492
New class of catalysts for energy conversion: https:/
/ news. rub. de/ english/ press-releases/ 2019-05-06-material-research-new-class-catalysts-energy-conversion
- Noble metal-free catalyst system as active as platinum: https:/
/ news. rub. de/ english/ press-releases/ 2018-10-23-material-research-noble-metal-free-catalyst-system-active-platinum