The identified limitations of Pt motivated us to explore new catalyst compositions favouring the non-electrochemical pathway, to improve lactic acid product yield. As mentioned above, previous studies have shown that metal oxides with surface acidic sites can facilitate the DHA to lactic acid transformation, where it is even possible to directly convert glycerol into lactic acid when combined with metal catalysts that drive the first deprotonation step. Therefore, we screened several metal oxide materials with different acidic site densities, and designed a multicomponent tandem catalyst system containing Pt sites and metal oxides with abundant acidic sites, in order to combine the electrocatalytic capabilities of Pt to produce DHA from glycerol with the selectivity enhancement of the acid groups on the oxide towards lactic acid. corresponding to an electricity consumption per unit of H2 < 26 kWh kg -1 H2 (vs. ~38 kWh kg - 1 H2 for alkaline water electrolyser at similar current density), while the lactic acid product yield is maintained above 35 %.