Remarkable stability of a molecular ruthenium complex in PEM water electrolysis.
Marco BelliniJonas BöskenMichael WörleDebora ThönyJuan José Gamboa-CarballoFrank KrumeichFrancesco BàrtoliHamish A MillerLorenzo PogginiWerner OberhauserAlessandro LavacchiHansjörg GrützmacherFrancesco VizzaPublished in: Chemical science (2022)
The dinuclear Ru diazadiene olefin complex, [Ru 2 (OTf)(μ-H)(Me 2 dad)(dbcot) 2 ], is an active catalyst for hydrogen evolution in a Polymer Exchange Membrane (PEM) water electrolyser. When supported on high surface area carbon black and at 80 °C, [Ru 2 (OTf)(μ-H)(Me 2 dad)(dbcot) 2 ]@C evolves hydrogen at the cathode of a PEM electrolysis cell (400 mA cm -2 , 1.9 V). A remarkable turn over frequency (TOF) of 7800 mol H 2 mol catalyst -1 h -1 is maintained over 7 days of operation. A series of model reactions in homogeneous media and in electrochemical half cells, combined with DFT calculations, are used to rationalize the hydrogen evolution mechanism promoted by [Ru 2 (OTf)(μ-H)(Me 2 dad)(dbcot) 2 ].
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