USTC obtains Pd-Pt tesseracts for oxygen reduction reaction

January 12, 2021

A proton exchange membrane fuel cell is a chemical cell that converts energy released when a substance reacts into electrical energy with zero emission. It is an excellent substitute for fossil fuel.

However, low activity and stability of the Pt-based catalysts in the oxygen reduction reaction (ORR) of the battery cathode restricted the output power and the number of charge and discharge cycles, thus increasing the cost of the whole fuel cells. The preparation of cathode catalysts with high activity and stability is a difficult problem.

In a study published in Journal of the American Chemical Society, a team led by Prof. ZENG Jie from Hefei National Laboratory for Physical Sciences at the Microscale and Prof. BAO Jun from National Synchrotron Radiation Laboratory of University of Science and Technology of China of the Chinese Academy of Sciences made breakthrough in the controlled synthesis of Pd-Pt tesseracts for ORR and the mechanism investigation of their etching process.

Inspired by the evolution from a three-dimensional cube to a four-dimensional tesseracts, the researchers carried out oxidation etching on the Pd-Pt uniform alloy nanocubes, and obtained a new tesseracts framework structure of Pd-Pt catalyst by precisely adjusting the removal of Pd atoms and the rearrangement of remaining Pd and Pt atoms.

The structure has high surface ratio and high percentage of active sites, which greatly improve the atomic utilization. The mass activities of tesseracts frames is 1.86 A mg-1Pt, being 11.6 times as high as that of commercial Pt/C catalyst.

In addition, the catalyst obtained by oxidation etching maintains extremely high structural stability in the electrochemical testing environment. After 10,000 times of cyclic charging-discharge tests, its performance did not decrease significantly.

This study advances the understanding of the etching mechanism, and provides efficient strategies for the design of novel hollow frame structures for catalysis.

University of Science and Technology of China

Related Catalyst Articles from Brightsurf:

Chemistry: How nitrogen is transferred by a catalyst
Catalysts with a metal-nitrogen bond can transfer nitrogen to organic molecules.

A 40-year-old catalyst unveils its secrets
Activity of the industrial catalyst TS-1 relies on titanium pairs / important discovery for catalyst development

Hydrochloric acid boosts catalyst activity
A research team from the Technical University of Munich (TUM) led by chemist Johannes Lercher has developed a synthesis process which drastically increases the activity of catalysts for the desulfurization of crude oil.

Scientists get atomistic picture of platinum catalyst degradation
Degradation of platinum, used as a key electrode material in the hydrogen economy, severely shortens the lifetime of electrochemical energy conversion devices, such as fuel cells.

Methanol synthesis: Insights into the structure of an enigmatic catalyst
To render the production process more efficient, it would be helpful to know more about the copper/zinc oxide/aluminium oxide catalyst deployed in methanol production.

Ultrastable, selective catalyst for propane dehydrogenation developed
A group of Japanese scientists has developed an ultrastable, selective catalyst to dehydrogenate propane - an essential process to produce the key petrochemical substance of propylene - without deactivation, even at temperatures of more than 600°C.

Asymmetric iodoesterification of simple alkenes by concerto catalyst
Japanese researchers have succeeded in catalytic asymmetric iodoesterification from simple alkene substrates and carboxylic acids.

Catalyst enables reactions with the help of green light
For the first time, chemists at the University of Bonn and Lehigh University in Bethlehem (USA) have developed a titanium catalyst that makes light usable for selective chemical reactions.

New catalyst provides boost to next-generation EV batteries
A recent study, affiliated with South Korea's Ulsan National Institute of Science and Technology (UNIST) has introduced a new composite catalyst that could efficiently enhance the charg-discharge performances when applied to metal-air batteries (MABs).

MOF co-catalyst allows selectivity of branched aldehydes of up to 90%
Heterogeneous catalysts are often preferred because of their robustness and lower operating costs, but homogenous catalysts still dominate when high selectivity is needed -- finding superior heterogeneous catalysts has been a challenge.

Read More: Catalyst News and Catalyst Current Events is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to