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Au-Manganese Oxide Nanostructures by a Plasma-Assisted Process as Electrocatalysts for Oxygen Evolution: A Chemico-Physical Investigation Bigiani, Lorenzo Gasparotto, Alberto Andreu Arbella, Teresa Verbeeck, Johan Sada, Cinzia Modin, Evgeny Levedev, Oleg I. Morante i Lleonart, Joan Ramon Barreca, Davide Maccato, Chiara Òxid de magnesi Oxigen Nanoestructures Magnesium oxide Oxygen Nanostructures Earth-abundant and eco-friendly manganese oxides are promising platforms for the oxygen evolution reaction (OER) in water electrolysis. Herein, a versatile and potentially scalable route to gold-decorated manganese oxide-based OER electrocatalysts is reported. In particular, MnxOy(MnO2, Mn2O3) host matrices are grown on conductive glasses by plasma assisted-chemical vapor deposition (PA-CVD), and subsequently functionalized with gold nanoparticles (guest) as OER activators by radio frequency (RF)-sputtering. The final selective obtainment of MnO2- or Mn2O3-based systems is then enabled by annealing under oxidizing or inert atmosphere, respectively. A detailed material characterization evidences the formation of high-purity Mn(x)O(y)dendritic nanostructures with an open morphology and an efficient guest dispersion into the host matrices. The tailoring of Mn(x)O(y)phase composition and host-guest interactions has a remarkable influence on OER activity yielding, for the best performing Au/Mn(2)O(3)system, a current density of approximate to 5 mA cm(-2)at 1.65 V versus the reversible hydrogen electrode (RHE) and an overpotential close to 300 mV at 1 mA cm(-2). Such results, comparing favorably with literature data on manganese oxide-based materials, highlight the importance of compositional control, as well as of surface and interface engineering, to develop low-cost and efficient anode nanocatalysts for water splitting applications. 2022-01-17T13:51:14Z 2022-01-17T13:51:14Z 2020-09-24 2022-01-17T13:51:14Z info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Versió postprint del document publicat a: https://doi.org/10.1002/adsu.202000177 Advanced Sustainable Systems, 2020, vol. 5, num. 11 https://doi.org/10.1002/adsu.202000177 info:eu-repo/grantAgreement/EC/H2020/823717/EU//ESTEEM3 (c) Wiley-VCH, 2020 info:eu-repo/semantics/openAccess Wiley-VCH Articles publicats en revistes (Ciència dels Materials i Química Física)