Electrocatalytic Oxidation Of Glucose By Nanoporous Metal And Its Application In Fuel Cells

Glucose is a common substance in our daily life and in life activities which is a non-toxic,cheap and renewable green energy has these advantage: 1,Wide range of fuel sources,including the waste water from paper,wine and other industrial and the human body.2,Mild reaction conditions,which it can react at room temperature,atmospheric pressure,neutral pH value and easy to operate,control and maintenance.3,Good biocompatibility,it can provide energy for the human body artificial organ or as a biosensor.Direct glucose fuel cell(DGFC)has the advantages of green without pollution,high energy efficiency,fast response speed and low noise.It is expected to be used in small mobile power and the power for the installation of medical equipment.However,the lack of efficient glucose oxidation catalyst is the biggest problem,the initial study of the enzyme and microbial catalyst with easy to deactivate and the complex operation,widely used powdery non-biocatalyst also faces low activity problems.The nanoporous gold(NPG)prepared by dealloying with three dimensional bicontinuous structure has attracted much attention due to its special structure and good electrochemical properties.NPG has the high specific surface area,high porosity and high conductivity and so on,and it can be used as a catalyst for some oxidation reactions and shows good catalytic activity.In addition,NPG has good biocompatibility and stability for the implantable medical device.Therefore,this paper mainly explores the electrocatalytic oxidation of glucose by nanoporous metal and its application in glucose fuel cells,the specific research as follows:(1)Two kinds of nanoporous gold films were obtained by free corrosion and electrochemical corrosion.Electrochemical experiments were carried out in alkaline and neutral solutions.It was found that the smaller ligament size prepared by electrochemical corrosion were superior to free corrosion with large diameter in alkaline and neutral environment.On the basis of this,make the nanoporous gold as substrate,and the Pt shell was deposited by chemical reduction method,The NPG-Pt core-shell structure catalyst was obtained.The activity of NPG-Pt on the electrocatalytic oxidation of glucose was analyzed by the same method and obtained the same result.(2)Plating the dispersed Bi particles on NPG-Pt by electroplating method to form NPG-PtBi as anode and commercial Pt / C as cathode for direct glucose fuel cell.The effects of operating temperature and glucose fuel concentration and NaOH concentration on the performance of direct glucose fuel cells were investigated.Under the condition that the anode noble metal was only 0.45 mg cm2(Au 0.3 mg and Pt 0.15 mg),0.9 V open Voltage(OCV),maximum power density of 8 mW cm-2,maximum weight power density of 18 mW mg-1,about 4.5 times higher than that commercial Pt / C.