Research On Electrocatalysis Based On Single Metal Nanoelectrodes

In the past few decades,nanoelectrodes have attracted much attention due to their small overall size,low charging current,fast mass transfer rate,and high time and spatial resolution.They have been widely used in basic electrochemical research,single-particle analysis,single-cell sensing,and scanning electrochemical microscope（SECM）research fields.Inspired by the above,this article prepares single Au and Ag nanoelectrodes by laser-assisted pulling technique,and applies them to the following electrocatalytic research:1.Using single Ag nanodisk electrode as a substrate,single Pd@Ag alloy nanowire electrode was prepared by chemical etching and metal replacement reaction,and its catalytic performance for CH₃OH was studied from the level of a single nanowire.Results have shown that due to the presence of surface alloys,its electrochemical stability is greatly improved,and it exhibits excellent electrocatalytic activity for CH₃OH,providing new insights for the catalytic research of single particle/nanowire catalysts.2.Using the extremely small size of the Ag nanodisk electrode,study the single hydrogen nanobubble generated on the surface of the nanoelectrode,and use this to evaluate its hydrogen evolution performance.It was found that,compared with the bare Ag nanodisk electrode,the bubble formation potential of the Ag nanodisk electrode modified with Mo S₂ QDs was more positive,indicating that its hydrogen evolution activity was higher.The analysis of the micro-kinetic model shows that the average standard rate constant of the hydrogen evolution reaction of the Ag nanoelectrode modified with Mo S₂ QDs is about 10 times that of the Ag nanoelectrode.This work is based on the formation of nanobubbles and provides new ideas for the design and performance evaluation of hydrogen evolution reaction catalysts.3.Based on a single Au nanodisk electrode,single Au@Pt/Au core-shell bimetallic nanoparticle is modified to the surface of the electrode through the principle of surface self-assembly and electrostatic adsorption,and its catalytic performance for HCOOH is studied from the perspective of a single bimetallic nanoparticle.It was found that the single-particle catalyst has extremely high electrocatalytic activity and will provide a good platform for single-particle catalysis research in the energy field.