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Composition‐Dependent Morphology, Structure, and Catalytical Performance of Nickel–Iron Layered Double Hydroxide as Highly‐Efficient and Stable Anode Catalyst in Anion Exchange Membrane Water Electrolysis
Author(s) -
Jiang Wulyu,
Faid Alaa Y.,
Gomes Bruna Ferreira,
Galkina Irina,
Xia Lu,
Lobo Carlos Manuel Silva,
Desmau Morgane,
Borowski Patrick,
Hartmann Heinrich,
Maljusch Artjom,
Besmehn Astrid,
Roth Christina,
Sunde Svein,
Lehnert Werner,
Shviro Meital
Publication year - 2022
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202203520
Subject(s) - oxygen evolution , materials science , tafel equation , water splitting , catalysis , hydroxide , nickel , chemical engineering , anode , overpotential , electrolysis of water , transition metal , layered double hydroxides , inorganic chemistry , electrolysis , electrode , electrochemistry , chemistry , metallurgy , electrolyte , biochemistry , photocatalysis , engineering
Water splitting is an environmentally friendly strategy to produce hydrogen but is limited by the oxygen evolution reaction (OER). Therefore, there is an urgent need to develop highly efficient electrocatalysts. Here, NiFe layered double hydroxides (NiFe LDH) with tunable Ni/Fe composition exhibit corresponding dependent morphology, layered structure, and chemical states, leading to higher activity and better stability than that of conventional NiFe LDH‐based catalysts. The characterization data show that the low overpotentials (249 mV at 10 mA cm –2 ), ultrasmall Tafel slopes (24 mV dec –1 ), and high current densities of Ni 3 Fe LDH result from the larger fraction of trivalent Fe 3+ and the optimized local chemical environment with more oxygen coordination and ordered atomic structure for the metal site. Owing to the active intermediate species, Ni(Fe)OOH, under OER conditions and a reversible dynamic phase transition during the cycling process, the Ni 3 Fe LDH achieves a high current density of over 2 A cm –2 at 2.0 V, and durability of 400 h at 1 A cm –2 in a single cell test. This work provides insights into the relationship between the composition, electronic structure of the layer, and electrocatalytic performance, and offers a scalable and efficient strategy for developing promising catalysts to support the development of the future hydrogen economy.