Maqola

Synergistic Catalytic Sites in High‐Entropy Metal Hydroxide Organic Framework for Oxygen Evolution Reaction

Arkendu RoyFederal Institute of Materials Research and Testing (BAM) Richard‐Willstätter‐Str 11 12489 Berlin GermanySourabh KumarFederal Institute of Materials Research and Testing (BAM) Richard‐Willstätter‐Str 11 12489 Berlin GermanyAna Guilherme BuzanichFederal Institute of Materials Research and Testing (BAM) Richard‐Willstätter‐Str 11 12489 Berlin GermanyCarsten PrinzFederal Institute of Materials Research and Testing (BAM) Richard‐Willstätter‐Str 11 12489 Berlin GermanyEmilia GötzRigaku Europe SE Hugenottenallee 167 63263 Neu‐Isenburg GermanyAnika RetzmannFederal Institute of Materials Research and Testing (BAM) Richard‐Willstätter‐Str 11 12489 Berlin GermanyTilmann HickelFederal Institute of Materials Research and Testing (BAM) Richard‐Willstätter‐Str 11 12489 Berlin GermanyBiswajit BhattacharyaFederal Institute of Materials Research and Testing (BAM) Richard‐Willstätter‐Str 11 12489 Berlin GermanyFranziska EmmerlingFederal Institute of Materials Research and Testing (BAM) Richard‐Willstätter‐Str 11 12489 Berlin Germany

2024en

ABI

Annotatsiya

Abstract The integration of multiple elements in a high‐entropy state is crucial in the design of high‐performance, durable electrocatalysts. High‐entropy metal hydroxide organic frameworks (HE‐MHOFs) are synthesized under mild solvothermal conditions. This novel crystalline metal–organic framework (MOF) features a random, homogeneous distribution of cations within high‐entropy hydroxide layers. HE‐MHOF exhibits excellent electrocatalytic performance for the oxygen evolution reaction (OER), reaching a current density of 100 mA cm −2 at ≈1.64 V RHE , and demonstrates remarkable durability, maintaining a current density of 10 mA cm −2 for over 100 h. Notably, HE‐MHOF outperforms precious metal‐based electrocatalysts despite containing only ≈60% OER active metals. Ab initio calculations and operando X‐ray absorption spectroscopy (XAS) demonstrate that the high‐entropy catalyst contains active sites that facilitate a multifaceted OER mechanism. This study highlights the benefits of high‐entropy MOFs in developing noble metal‐free electrocatalysts, reducing reliance on precious metals, lowering metal loading (especially for Ni, Co, and Mn), and ultimately reducing costs for sustainable water electrolysis technologies.

Hali tarjima qilinmagan

Identifikatorlar

DOI: 10.1002/adma.202408114

Iqtiboslar va manbalar

2 ta iqtibos0 ta foydalanilgan manba

Koʻrsatkichlar — AkademScholar