The world is run by catalysts. They clean up after cars, help make fertilizers, and could be the key to better hydrogen fuel. Now, a team of chemists, led by Xiaohu Xia from Michigan Technological University, has found a better way to make metal nanoframe catalysts.
Last week, Nano Letters published the team's study, which covers how the researchers made a catalyst for the first time out of the noble metal ruthenium.
The effort brought together a team from Michigan Tech, the Argonne National Laboratory, University of Texas at Dallas, and Temple University. The team's break-through is not limited to ruthenium, however. Xia says the process they developed is most important.
"We are fine-tuning the surface, size, shape and crystal structure," he says. "Our goal is to increase their catalytic activity while reducing the usage of this precious material."
The key is more surface area. Nanoframes, which are nanoparticles with open centers, have an advantage with their gazebo-like atomic arrangements.
Xia adds that not only shape but crystal structure is important, "Because catalytic reactions occur only on the surface of materials, the surface atom arrangement has a great impact on determining the catalytic activity."
In general, ruthenium nanocrystals adopt the hexagonal close-packed (hcp) structure. But Xia and his team came up with an elegant solution for making ruthenium nanocrystals with another structure: face-centered cubic (fcc) structure.
The process involves two steps, growth and etching. Basically, hcp ruthenium doesn't naturally grow in a crystal structure that can be made into a nanoframe. So, the team directed ruthenium growth on a palladium seed with an fcc structure, which the ruthenium replicated. Then they removed the palladium core, leaving behind an fcc ruthenium nanoframe.
To ensure the material had catalytic potential, the team ran the ruthenium nanoframes through several diagnostic tests: the reduction of p-nitrophenol by NaBH4 and the dehydrogenation of ammonia borane. While more data is needed to quantify how well ruthenium holds up against existing metal catalysts, Xia says the results from their experiments are promising.
Once the material has been vetted, researchers will be able to start applying the catalyst to several big challenges. Namely, Xia says that ruthenium nanoframes and other catalysts with unique crystal structures could improve hydrogen fuel production and carbon storage.
Xiaohu Xia | EurekAlert!
Scientists have a new way to gauge the growth of nanowires
19.03.2018 | DOE/Argonne National Laboratory
Researchers demonstrate existence of new form of electronic matter
15.03.2018 | University of Illinois at Urbana-Champaign
For the first time, an interdisciplinary team from the University of Basel has succeeded in integrating artificial organelles into the cells of live zebrafish embryos. This innovative approach using artificial organelles as cellular implants offers new potential in treating a range of diseases, as the authors report in an article published in Nature Communications.
In the cells of higher organisms, organelles such as the nucleus or mitochondria perform a range of complex functions necessary for life. In the networks of...
Animal photoreceptors capture light with photopigments. Researchers from the University of Göttingen have now discovered that these photopigments fulfill an...
On 15 March, the AWI research aeroplane Polar 5 will depart for Greenland. Concentrating on the furthest northeast region of the island, an international team...
The world’s second-largest ice shelf was the destination for a Polarstern expedition that ended in Punta Arenas, Chile on 14th March 2018. Oceanographers from...
At the 2018 ILA Berlin Air Show from April 25–29, the Fraunhofer Institute for Laser Technology ILT is showcasing extreme high-speed Laser Material Deposition (EHLA): A video documents how for metal components that are highly loaded, EHLA has already proved itself as an alternative to hard chrome plating, which is now allowed only under special conditions.
When the EU restricted the use of hexavalent chromium compounds to special applications requiring authorization, the move prompted a rethink in the surface...
19.03.2018 | Event News
16.03.2018 | Event News
13.03.2018 | Event News
19.03.2018 | Physics and Astronomy
19.03.2018 | Materials Sciences
19.03.2018 | Event News