What is it about?
Novel Mo-doped NiFe-P nanoflowers are developed as a high-activity and robust catalyst for OER via phosphidation of MoO42- intercalated NiFe-LDH. Due to the electronic interactions of Mo with Ni and Fe, the introduction of high valence Mo can alter the intrinsic electronic structure of NiFe-P, thereby accelerating the reaction kinetics and further promoting the catalytic activity of OER.
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Why is it important?
It involves the synthesis of Mo-doped NiFe-P (Mo-NiFe-P) nanoflowers from MoO42- intercalated NiFe-LDHs. The composition and electronic characteristics of Mo-NiFe-P were regulated by controlling the amount of MoO42- intercalated NiFe-LDH precursor. DFT calculations show that introducing Mo could optimize the ΔG of the reaction path and reduce the kinetic energy barrier of the reaction. Notably, the Mo-NiFe-P with 16% Mo doping exhibits outstanding OER performances, which only need 261 and 272 mV to reach a current density of 50 and 100 mA·cm-2 in 1 M KOH.
Perspectives
Benefiting from the diversity of intercalation molecules and metal cations in LDHs, the preparation method of LDH precursors presented in this work can be generalized to preparing other transition metal phosphorus compounds. This approach could extend to preparing other cost-efficient phosphides for OER.
Yun Zhao
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This page is a summary of: Molybdate intercalated nickel–iron-layered double hydroxide derived Mo-doped nickel–iron phosphide nanoflowers for efficient oxygen evolution reaction, Energy Materials and Devices, September 2023, Tsinghua University Press,
DOI: 10.26599/emd.2023.9370002.
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