Oxygen Reduction Reaction (ORR) on Huge Gold (Au) Particles Prepared by a Pyrolysis Process of AuCl3 Dissolved in Distilled Water in the Presence of MWCNTs

Gold (Au) huge particles were prepared by a pyrolysis process of AuCl₃ dissolved in distilled water in the presence of multi‐walled carbon nanotubes (MWCNTs). X‐ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the obtained samples. The results showed that Au huge particles with a diameter close to 500 nm were fabricated. The electrocatalytic performance of the huge Au particles modified graphite electrode in the oxygen reduction reaction (ORR) was investigated using cyclic voltammetry (CV). It indicated that the pyrolysis time was a key factor that can affect the electrocatalysis of Au huge particles towards ORR. Developing a novel and simple method of pyrolysis for fabricating Au huge particles is the main contribution of this work, which will be very helpful in the preparation of Au huge particles on a large scale.