期刊
ADVANCED SUSTAINABLE SYSTEMS
卷 5, 期 11, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsu.202000177
关键词
manganese oxides; oxygen evolution reaction; strong metal-support interaction
资金
- Padova University (DOR 2017-2019)
- Padova University (P-DiSC) [03BIRD2018-UNIPD OXYGENA]
- INSTM Consortium [INSTMPD004 - NETTUNO]
- AMGA Foundation (Mn4Energy project)
- Hercules fund from the Flemish Government
- GOA project Solarpaint from the University of Antwerp
- EU H2020 [823717]
This study presents a versatile approach for preparing manganese oxide catalysts, focusing on gold-decorated manganese oxide-based OER electrocatalysts. By characterizing and controlling the composition of Mn(x)O(y) phases, high OER activity was achieved, demonstrating the potential for developing low-cost and efficient anode nanocatalysts for water splitting applications.
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.
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