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Advanced energy materials: hierarchical multi-element nanoparticles as bifunctional catalysts for oxygen precipitation and reduction

wallpapers News 2020-12-13
Oxygen reduction reaction (ORR) oxygen evolution reaction (OER) of

oxygen electrode are the basic components of metal air battery. In order to overcome the complex slow four electron transfer process it is necessary to prepare efficient inexpensive electrocatalysts. Single component electrocatalysts usually show only selective oer or orr activity due to their specific affinity for oxygen reaction intermediates (* O * Oh * ooh). Therefore it is an ideal way to realize the bifunctional catalysts by adding various active oxygen reaction catalysts (such as Pt IR other non precious materials) with different bond cooperation into the multi-element catalysts. However due to the complex composition the preparation of multi-element nano catalyst with optimal structure is still challenging. Different atomic sizes crystal structures miscibility other intrinsic properties make it difficult to integrate different elements into a single multi-element nanoparticle. In addition the agglomeration of nano catalyst leads to the poor stability of catalyst which is also a serious problem. Therefore in order to achieve efficient catalytic oxygen electrode reaction it is necessary to develop multi-element nanoparticles with optimized element mixing stable structure.

Hu liangbing Li Teng of the University of Maryl proposed a one-step synthesis method to prepare hierarchical multi-element nanomaterials including ultrafine noble metal nanoparticles (IRPT ≈ 5 nm) anchored on spinel transition metal oxide nanoparticles. The multi-element nanoparticles can be used as excellent bifunctional catalysts for oxygen precipitation reduction. Hierarchical multi-element nanoparticles were prepared by

through one-step high temperature shock technology the ultra-fine IRPT alloy was anchored on 45 nm feconiox. This hierarchical multi-element nanostructure reduces the amount of precious metals stabilizes the IRPT alloy forms a large electroactive area. Therefore only 240 MV overpotential (@ 10 Ma cm-2) small Tafel slope (34 MV dec-1) are needed in the oer process. At the same overpotential the orr mass catalytic activity of multi-element nanoparticles is 7 times that of Pt the oer mass catalytic activity is 28 times that of IR which indicates that the bifunctional electrocatalyst has high catalytic activity for oxygen. Meanwhile the bifunctional catalyst showed excellent electrocatalytic stability. DFT calculation shows that the synergistic effect of feconiox IRPT reduces the potential barrier of electrocatalytic reaction which promotes the hierarchical multi-element nano catalysts to exhibit high-efficiency oer orr electrocatalytic performance. This highly efficient durable bifunctional oxygen electrocatalyst can greatly improve the energy efficiency of metal air batteries provide potential applications in water electrolysis fuel cells so on. The hierarchical multi-element nanoparticles provide a reference for the design of other multifunctional electrocatalytic nano materials with long life low cost.


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