Jozwiak, E.; Phan, A.; Schultz, T.; Koch, N.; Pinna, N.: Structure Properties Correlations on Nickel-Iron Oxide Catalysts Deposited by Atomic Layer Deposition for the Oxygen Evolution Reaction in Alkaline Media. Advanced Energy & Sustainability Research 5 (2024), p. 2400091/1-10
10.1002/aesr.202400091
Open Access Version
Abstract:
Thermal atomic layer deposition (ALD) is used for the first time to deposit ironnickel oxides onto carbon nanotubes in a ternary process to produce a wide range of mixed oxide thin films. When using ferrocene (FeCp2) and nickelocene (NiCp2) with ozone (O3) as metals and oxygen sources, respectively, a competition between the metal precursors and the growth modes is observed. Indeed, while ferrocene promotes a 2D-growth, nickelocene prefers a 3D-growth. Although both precursors are homoleptic metallocenes, they behave differently in the ALD of their respective metal oxide, leading to unexpected atomic ratios and films morphologies of the iron-nickel oxides. The 2Fe:1Ni sample displays the best performances in the electrochemical water oxidation (oxygen evolution reaction) exhibiting an overpotential of 267 mV at a current density of 10 mA cm1, a Tafel slope of 36.8 mV dec1, as well as a good stability after 15 h of continuous operation.