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Water splitting allows the storage of solar energy into chemical bonds(H2+O2) and will help to implement the urgently needed replacement of limitedavailable fossil fuels. Particularly in neutral environment electrochemicallyinitiated water splitting suffers from low efficiency due to highoverpotentials caused by the anode. Electro-activation of X20CoCrWMo10-9, aCo-based tool steel resulted in a new composite material(X20CoCrWMo10-9//Co3O4) that catalyzes the anode half-cell reaction of waterelectrolysis with a so far unequalled effectiveness. The current densityachieved with this new anode in pH 7 corrected 0.1 M phosphate buffer is over awide range of overpotentials around 10 times higher compared to recentlydeveloped, up-to-date electrocatalysts and represents the benchmark performanceadvanced catalysts show in regimes that support water splitting significantlybetter than pH 7 medium. X20CoCrWMo10-9//Co3O4 exhibited electrocatalyticproperties not only at pH 7, but also at pH 13, which is much superior to theones of IrO2-RuO2, single-phase Co3O4- or Fe/Ni- based catalysts. Both XPS andFT-IR experiments unmasked Co3O4 as the dominating compound on the surface ofthe X20CoCrWMo10-9//Co3O4 composite. Upon a comprehensive dual beam FIB-SEM(focused ion beam-scanning electron microscopy) study we could show that thenew composite does not exhibit a classical substrate-layer structure due to theintrinsic formation of the Co-enriched outer zone. This structuralparticularity is basically responsible for the outstanding electrocatalytic OERperformance.

X20CoCrWMo10-9//Co3O4: a Metal-Ceramic Composite with Unique Efficiency Values for Water-Splitting in Neutral Regime