Electronic modulation of iridium single atomic sites on NiCr layered double hydroxide for an improved electrocatalytic oxygen evolution reaction

文献情報

出版日 2023-12-18

DOI 10.1039/D3TA05848D

インパクトファクター 12.732

著者

Swayamprakash Biswal, Divya, Biswajit Mishra, Darius Pohl, Bernd Rellinghaus, Bijay P. Tripathi

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要旨

Single atom catalysts (SACs) have shown immense potential in the field of electrocatalysis by effectively modulating the electronic properties of a heterogeneous matrix. Implementation of such cost-effective catalyst systems has become imperative for the facile completion of kinetically sluggish reactions, such as the oxygen evolution reaction (OER). In this study, we report the synthesis of an Ir SAC system stabilized through the surface functionalization of NiCr LDH. With an overpotential of 232 mV and a Tafel slope of 51 mV dec−1, Ir1/NiCr LDH showed a significant enhancement in the OER performance compared to pristine LDH and the state-of-the-art IrO2 catalyst. With a Faradaic efficiency of 96.3% and non-depleting OER performance throughout a stability study for 36 h, Ir1/NiCr LDH exhibited a higher multi-magnitude turnover frequency (TOF) and mass activity compared to IrO2. Detailed in situ and computational studies illustrated that the suitable binding geometry of Ir sites on the LDH surface and favorable chemical bonding with reactants and intermediates result in enhanced catalytic activity. The atomistic understanding of the subtle influence of SAC coordination on catalytic activities is highly valuable for its strategic design for targeted reactions.

掲載誌

Journal of Materials Chemistry A

CiteScore: 19.5

自己引用率: 4.7%

年間論文数: 2211

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