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Synthesis of High-Entropy Perovskite Hydroxides as Bifunctional Electrocatalysts for Oxygen Evolution Reaction and Oxygen Reduction Reaction.

Sangwoo ChaeAkihito ShioTomoya KishidaKosuke FurutonoYumi KojimaGasidit PanomsuwanTakahiro Ishizaki
Published in: Materials (Basel, Switzerland) (2024)
Oxygen reduction reaction (ORR) and oxygen evolutionc reaction (OER) are important chemical reactions for a rechargeable lithium-oxygen battery (LOB). Recently, high-entropy alloys and oxides have attracted much attention because they showed good electrocatalytic performance for oxygen evolution reaction (OER) and/or oxygen reduction reaction (ORR). In this study, we aimed to synthesize and characterize CoSn(OH) 6 and two types of high-entropy perovskite hydroxides, that is, (Co 0.2 Cu 0.2 Fe 0.2 Mn 0.2 Mg 0.2 )Sn(OH) 6 (CCFMMSOH) and (Co 0.2 Cu 0.2 Fe 0.2 Mn 0.2 Ni 0.2 )Sn(OH) 6 (CCFMNSOH). TEM observation and XRD measurements revealed that the high-entropy hydroxides CCFMMSOH and CCFMNSOH had cubic crystals with sides of approximately 150-200 nm and crystal structures similar to those of perovskite-type CSOH. LSV measurement results showed that the high-entropy hydroxides CCFMMSOH and CCFMNSOH showed bifunctional catalytic functions for the ORR and OER. CCFMNSOH showed better catalytic performance than CCFMMSOH.
Keyphrases
  • metal organic framework
  • room temperature
  • working memory
  • photodynamic therapy
  • gold nanoparticles
  • reduced graphene oxide