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000910343 1001_ $$0P:(DE-HGF)0$$aJiang, Wulyu$$b0
000910343 245__ $$aComposition‐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
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000910343 520__ $$aWater splitting is an environmentally friendly strategy to produce hydrogen but is limited by the oxygen evolution reaction (OER). Therefore, there is an urgent need to develop highly efficient electrocatalysts. Here, NiFe layered double hydroxides (NiFe LDH) with tunable Ni/Fe composition exhibit corresponding dependent morphology, layered structure, and chemical states, leading to higher activity and better stability than that of conventional NiFe LDH-based catalysts. The characterization data show that the low overpotentials (249 mV at 10 mA cm–2), ultrasmall Tafel slopes (24 mV dec–1), and high current densities of Ni3Fe LDH result from the larger fraction of trivalent Fe3+ and the optimized local chemical environment with more oxygen coordination and ordered atomic structure for the metal site. Owing to the active intermediate species, Ni(Fe)OOH, under OER conditions and a reversible dynamic phase transition during the cycling process, the Ni3Fe LDH achieves a high current density of over 2 A cm–2 at 2.0 V, and durability of 400 h at 1 A cm–2 in a single cell test. This work provides insights into the relationship between the composition, electronic structure of the layer, and electrocatalytic performance, and offers a scalable and efficient strategy for developing promising catalysts to support the development of the future hydrogen economy.
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000910343 7001_ $$0P:(DE-HGF)0$$aFaid, Alaa Y.$$b1
000910343 7001_ $$0P:(DE-HGF)0$$aGomes, Bruna Ferreira$$b2
000910343 7001_ $$0P:(DE-Juel1)179530$$aGalkina, Irina$$b3
000910343 7001_ $$0P:(DE-Juel1)175127$$aXia, Lu$$b4
000910343 7001_ $$0P:(DE-HGF)0$$aLobo, Carlos Manuel Silva$$b5
000910343 7001_ $$0P:(DE-HGF)0$$aDesmau, Morgane$$b6
000910343 7001_ $$0P:(DE-HGF)0$$aBorowski, Patrick$$b7
000910343 7001_ $$0P:(DE-Juel1)166271$$aHartmann, Heinrich$$b8
000910343 7001_ $$0P:(DE-HGF)0$$aMaljusch, Artjom$$b9
000910343 7001_ $$0P:(DE-Juel1)133839$$aBesmehn, Astrid$$b10
000910343 7001_ $$0P:(DE-HGF)0$$aRoth, Christina$$b11
000910343 7001_ $$0P:(DE-HGF)0$$aSunde, Svein$$b12
000910343 7001_ $$0P:(DE-Juel1)129883$$aLehnert, Werner$$b13
000910343 7001_ $$0P:(DE-Juel1)165174$$aShviro, Meital$$b14$$eCorresponding author
000910343 773__ $$0PERI:(DE-600)2039420-2$$a10.1002/adfm.202203520$$gVol. 32, no. 38, p. 2203520 -$$n38$$p2203520 -$$tAdvanced functional materials$$v32$$x1057-9257$$y2022
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