Sputter deposition of highly active complex solid solution electrocatalysts into an ionic liquid library: effect of structure and composition on oxygen reduction activity

Nanoscale
Alba Garzón ManjónChristina Scheu

Abstract

Complex solid solution electrocatalysts (often called high-entropy alloys) present a new catalyst class with highly promising features due to the interplay of multi-element active sites. One hurdle is the limited knowledge about structure-activity correlations needed for targeted catalyst design. We prepared Cr-Mn-Fe-Co-Ni nanoparticles by magnetron sputtering a high entropy Cantor alloy target simultaneously into an ionic liquid library. The synthesized nanoparticles have a narrow size distribution but different sizes (from 1.3 ± 0.1 nm up to 2.6 ± 0.3 nm), different crystallinity (amorphous, face-centered cubic or body-centered cubic) and composition (i.e. high Mn versus low Mn content). The Cr-Mn-Fe-Co-Ni complex solid solution nanoparticles possess an unprecedented intrinsic electrocatalytic activity for the oxygen reduction reaction in alkaline media, some of them even surpassing that of Pt. The highest intrinsic activity was obtained for body-centered cubic nanoparticles with a low Mn and Fe content which were synthesized using the ionic liquid 1-etyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [Emimi][(Tf)2N].

References

Jun 30, 2015·Physical Chemistry Chemical Physics : PCCP·Zhiqi He, Paschalis Alexandridis
Jun 8, 2017·Topics in Current Chemistry·Susann Wegner, Christoph Janiak
Feb 7, 2018·Chemical Reviews·Ambarish KulkarniJens K Nørskov
Mar 10, 2018·ACS Combinatorial Science·Hajo MeyerAlfred Ludwig
Mar 31, 2018·Science·Yonggang YaoLiangbing Hu
Jun 23, 2018·Bioconjugate Chemistry·Alba Garzón-ManjónCarme Nogués
Sep 7, 2019·Nature Communications·Pengfei XieChao Wang

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Citations

May 14, 2021·Science Advances·Yifan Sun, Sheng Dai
Aug 27, 2021·Angewandte Chemie·Tobias LöfflerWolfgang Schuhmann

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Methods Mentioned

BETA
transmission
X-ray

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