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. (13th July 2022)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Advanced functional materials. Volume 32:Number 38(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-13
• Subjects: in situ Raman -- NiFe‐layered double hydroxides -- oxygen evolution reaction -- water electrolysis -- X‐ray absorption spectroscopy; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202203520
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: 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 Ni3 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 Ni3 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. Abstract : A composition and structure‐modulated Ni3 Fe layered double hydroxide (LDH) exhibits an optimal local chemical environment to trigger the oxygen evolution reaction. Compared with commercial Ir electrodes, the water electrolyzer fabricated by Ni3 Fe LDH as anode shows superior current density, as well as a robust lifespan at 1 A cm –2 for 400 h.