Oxygen‐Bridged Ga‐O‐PtPd Triple Sites Boost Methanol‐Assisted Rechargeable Zn‐Air Batteries Through Suppressing COads Generation

The O-bridged Ga-O-PtPd triple sites are designed and constructed, which show an enhanced catalytic activity and CO_ads poisonous resistance, as well as excellent durability toward liquid fuels electrooxidation. The above results can be attributed to strengthened “non-CO” pathway selectivity by forming HCOO⁻ species during MOR.

Abstract

Constructing high-efficiency platinum (Pt)-based catalysts for methanol oxidation reaction (MOR) by suppressing the intermediate CO_ads generation is strongly desired and remains a grand challenge. Herein, the concept of holding O-bridged triple sites is documented to strengthen “non-CO” pathway selectivity by forming HCOO⁻ species during MOR. The obtained Ga-O-PtPd triple sites via grafting the single-atomic Ga sites on PtPd nanosheets achieves a high current density of 3.05 mAcm⁻² of MOR, which is 5.65 times higher than commercial Pt/C (0.54 mAcm⁻²), as well as remarkably stability and CO_ads poison resistance. The CO diffuse reflectance infrared Fourier transform spectroscopy (CO-DRIFTS) results reveal that Ga-O-PtPd triple sites present a weak CO binding ability, reducing the generation of CO_ads intermediate. In addition, the Ga-O-PtPd-based Zn-methanol-air batteries present an excellent activity and stability compared with commercial catalysts.