Technological advances have increased the competitiveness of solar-generated electricity compared to electricity generated from fossil fuels. Similar advances are necessary to improve the direct conversion of sunlight to fuels as a storage medium. Important solar fuels reactions include water electrolysis (solar-to-hydrogen, STH) or electrocatalytic CO2 reduction to produce useful products such as methanol or ethanol. A fundamental limit to the energy storage efficiency of these processes is the choice of reaction on the anode. In water, the anodic reaction is generally water oxidation, where the cathodic products are kept and the O2 is discarded. The water oxidation potential (E 0 = 1.23 V vs. RHE at 25 ○ C, Equations S1-S4) and associated kinetic overpotentials limit the achievable energy conversion efficiencies for the products of interest that are produced at the cathode. The glycerol electrooxidation reaction (GEOR) is an appealing alternative to water oxidation at the anode for pairing with fuel-forming reactions at the cathode. Glycerol is a coproduct of the transesterification reaction that produces biodiesel. Roughly 3 million tons of glycerol was produced in 2020 from biodiesel manufacturing, higher than its global demand. As a result, there is significant scientific and engineering interest in adding value to the abundant glycerol supply by chemical transformation.