Surface Plasmon Resonance Enhance The Electrocatalytic Performance Of Noble Metal Nanostructures

In recent years,with the increase of energy crisis and environmental pollution,it is urgent to develop a clean and environmentally friendly energy.Among them,the direct conversion of solar energy into chemical energy by photocatalyst has attracted wide attention.At present,the photocatalysts are mainly semiconductors,but studies showed that plasmonic metal nanostructures such as gold and silver nanoparticles can also effectively convert solar energy into chemical energy.Plasmonic metal nanoparticles can convert the energy of photons into the energy of hot carriers,these high-energyic electrons either transfer into anti-bond orbits of the molecules adsorbed on the nanoparticles,or recombine with holes and releas energy in the form of heat.In this paper,plasmonic metal nanoparticles?gold,silver and palladium?were fabricated,they were used f in alcohol fuel cell and ascorbic acid detection.The research contents and results are as follows:1.Spherical gold nanoparticles?Au NSs?,multi-branched gold nanoparticles?Au NMs?and gold nanorods?Au NRs?were prepared by solution method for photoelectrocatalytic oxidation of methanol?MOR?.The effects of morphology of gold nanocatalysts on MOR under light irradiation were studied.The peak current density enhanced 3.1 times under light than that under dark,which was due to the local surface plasmon resonance effect?LSPR?on the gold surface.The catalytic performance,durability and resistance to CO poisoning of Au nanocatalysts at different temperatures were investigated,the effects of visible light intensity and wavelength on MOR were investigated.2.PdFe ultrathin nanosheets?PdFe NSs?were prepared by solvothermal method and used for photocatalytic oxidation of ethylene glycol.PdFe NSs showed excellent activity for electrocatalytic oxidation of ethylene glycol,and the current density increased 1.78times under light(from 4.02 to 7.17A mg^-1).The effects of the Pd/Fe ratio,light intensity and light wavelength on the performance of electrocatalytic ethylene glycol were studied.3.Ag nanosheets?Ag NSs?was prepared by solution method,and a electrochemical sensor for ascorbic acid detection was designed.Ag nanosheets showed specific catalytic activity against the electrocatalytic oxidation of ascorbic acid.Based on this,a ascorbic acid electrochemical sensor was designed.The sensitivity enhanced 3 times,the limit of detection is 40?mol L^-1?S/N=3?,with a linear range of 0.05-7 mmol L^-1.