PANI-SnO2 nanorods decorated with Pdx-Niy nanoparticles for improved electrooxidation of methanol with extended durability

This work shows that PANI-SnO2 nanorods with unique morphology and fine distribution of Pd-Ni alloy nanoparticles exhibit superior electrocatalytic performance toward methanol oxidation reaction (MOR). The amount of Ni content in Pdx-Niy/PANI-SnO2 nanorods plays a key role in Pd utilization. Ni in Pdx-Niy/PANI-SnO2 catalyst significantly reduces the CO adsorption on the active catalyst surface and enhances the electrode kinetics. The Pd3Ni1/PANI-SnO2 composite exhibits high mass activity (1861.9 mA mg−1) with extended stability even after 10000 cycles (∼90% retention) compared to other PdxNiy counterparts, Pd/PANI-SnO2, and commercial Pd/C catalysts. Interestingly, adding Ni along with SnO2 improves the electronic effect of Pd metal, significantly enhancing its catalyst activity and stability. Based on the results, we hope the present work brings an innovative approach to constructing efficient and cost-effective electrocatalysts for electrooxidation methanol in an alkaline medium.