Mesoporous Co-Na pyrophosphate/reduced graphene oxide as an oxygen evolution reaction electrocatalyst

In the current work, for the first time, hard-templating method was applied to synthesize mesoporous Na 2 CoP 2 O 7 powder for oxygen evolution reaction (OER) application. X-ray diffraction patterns (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and Brunauer–Emmett–Teller (BET) analyses were carried out for investigating the structure, composition, and morphology of the electrocatalyst powder. The electrocatalytic performances of the mesoporous Na 2 CoP 2 O 7 (meso-Na 2 CoP 2 O 7 ) powder along with its composites with reduced graphene oxide (rGO) were studied by linear sweep voltammetry (LSV). The meso-Na 2 CoP 2 O 7 /rGO (50/50 wt%) composite required only 167 mV overpotential to produce a current density of 10 mA cm −2 .