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A Molecular Approach to Manganese Nitride Acting as a High Performance Electrocatalyst in the Oxygen Evolution Reaction |
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| Authors: | Carsten Walter Dr Prashanth W Menezes Steven Orthmann Jona Schuch Paula Connor Dr Bernhard Kaiser Prof?Dr Martin Lerch Prof?Dr Matthias Driess |
| Institution: | 1. Department of Chemistry, Metalorganics and Inorganic Materials, Technische Universit?t Berlin, Berlin, Germany;2. Department of Chemistry, Solid State Chemistry, Technische Universit?t Berlin, Berlin, Germany;3. Institute of Material Science, Technische Universit?t Darmstadt, Darmstadt, Germany |
| Abstract: | The scalable synthesis of phase‐pure crystalline manganese nitride (Mn3N2) from a molecular precursor is reported. It acts as a superiorly active and durable electrocatalyst in the oxygen evolution reaction (OER) from water under alkaline conditions. While electrophoretically deposited Mn3N2 on fluorine tin oxide (FTO) requires an overpotential of 390 mV, the latter is substantially decreased to merely 270 mV on nickel foam (NF) at a current density of 10 mA cm?2 with a durability of weeks. The high performance of this material is due to the rapid transformation of manganese sites at the surface of Mn3N2 into an amorphous active MnOx overlayer under operation conditions intimately connected with metallic Mn3N2, which increases the charge transfer from the active catalyst surface to the electrode substrates and thus outperforms the electrocatalytic activity in comparison to solely MnOx‐based OER catalysts. |
| Keywords: | conductive materials corrosion energy storage metal nitrides overpotentials |