Osmium‐Doped WO2.72 as a Promising Electrocatalyst for Hydrogen Evolution Linking to Glucose Oxidation

Abstract

Herein, the organic matter is reported to reduce the overpotential of oxygen evolution reaction (OER) for water splitting. Herein, osmium (Os) is doped into WO2.72 to form Os–WO2.72 as an electrocatalyst, which is applied into water splitting to produce hydrogen and assist promote glucose oxidization reaction (GOR). The OER overpotential of 0.05 Os–WO2.72 is only 248 mV at 10 mA cm−2 in 1 m KOH, which is much superior to commercial RuO2. Additionally, the 0.05 Os–WO2.72 has ultralow GOR overpotential of 158 mV at 10 mA cm−2 and 365 mV at 100 mA cm−2 in 1 m KOH with 0.1 m glucose, and the cell voltage is 1.37 V at 10 mA cm−2, the values are much lower than its electrocatalytic behaviors in 1 m KOH. The anode produces gluconic acid, which is an important industrial intermediate during hydrogen production at the cathode.