Design And Manufacture Of Direct Methanol-hydrogen Peroxide Fuel Cell Based On Graphene And Study Of Its Performance

As an environmentally friendly form of energy utilization,fuel cells are one of the best ways to replace traditional power sources.In this paper,a new type of passive direct methanol-hydrogen peroxide fuel cell(DMHPFC)is successfully designed and manufactured.It uses hydrogen peroxide instead of oxygen as the oxidant,and uses reduced graphene oxide-supported Prussian Blue(r GO-PB),a methanol-resistant non-precious metal material,instead of the precious metal platinum as the cathode catalyst,which avoids the negative impact of methanol crossover in traditional direct methanol fuel cell(DMFC)currently,and greatly reduces its manufacturing cost.Its theoretical voltage reaches 1.76 V,which is higher than 1.21V related to the traditional DMFC.And its peak power density is as high as 20.5 m W/cm~2 at85°C,which is better than the performance of passive DMFC at the same level.This paper starts from four aspects,and conducts research on the design and manufacture of passive DMHPFC,the preparation process of graphene-based catalyst,the performance test of hydrogen peroxide half-cell,and the performance test of DMHPFC full-cell.In order to simplify the assembly process,the passive DMHPFC adopts a plate-like stacked structure.Both the fuel cavity and the current collectors are made of corrosion-resistant and easy-to-process stainless steel.The fuel cavity is a built-in fuel cavity with a closed structure,and the fuel flow channel of the current collectors adopts an array-type through-hole design.The membrane electrode is based on carbon cloth and is prepared by the gas diffusion electrode(GDE)method.r GO as the substrate of PB helps to enhance its electrical conductivity.The r GO-PB composite material with a unique three-dimensional conductive network is prepared by a low-temperature hydrothermal method.The effects of process parameters such as the concentration of hydrochloric acid,the reaction temperature,and the ratio of growth regulator on the morphology of PB are studied.The effects of reaction time and reaction temperature on the reduction degree of r GO are studied.The operating parameters that affect the performance of the hydrogen peroxide half-cell are studied,including scan rate,fuel concentration,fuel stabilizer concentration,fuel stabilizer type,and operating temperature.Through comparison,it is found that the performance of the hydrogen peroxide half-cell based on r GO-PB far exceeds that of the hydrogen peroxide half-cell based on r GO.The operating parameters and structural parameters affecting the full-cell DMHPFC are studied,including fuel concentration,working temperature,fastening pressure,and porosity of the current collectors.Steady-state performance and dynamic characteristic tests show that DMHPFC has good stability and fast response capabilities.In addition,neat methanol is successfully used as the fuel supply of the cell,and its steady-state performance and dynamic characteristics are also tested accordingly.