Manufacturing Process Of Super-hydrophobic Porous Flow Distributor And Its Application Mechanism In PAB-DMFC

Energy, the material basis for national economic development drives the human society forward. With the improvement of productivity levels, human beings come to realize that traditional fossil fuels would eventually be exhausted one day, and energy release process is limited by the Carnot cycle. The passive air-breathing direct methanol fuel cell（PAB-DMFC） has been a research hotspot in the field of energy science and electrochemistry due to its simple structure, high energy density and short start-up time. However, challenges about methanol crossover, CO₂ management and water management limit the further performance improvement seriously. In this situation, considering the wettability of structural components, this paper introduces super-hydrophobic porous mental material as anode porous flow distributer to optimize cell structure, and analyzes its corresponding function mechanism. The main contents of this thesis include:1. Super-hydrophobic treatment & process optimization of porous flow distributorOn the traditional solution-immersion method, this chapter introduces sintering process to fabricate super-hydrophobic structure on copper surface with high bonding strength, and reports the effects of oxidation time, sintering temperature, holding time and modification time on the surface morphology and super-hydrophobic properties. Producing PMFSS by metal-fiber multi-tooth cutting and high-temperature solid-phase sintering, and treat it to super-hydrophobicity by optimized solution-immersion method.2. Structure and performance of SHOPFDA uniaxial tensile test is conducted to investigate the effects of fiber length and natural aging factor on the tensile properties of the PMFSS. The permeability of SHOPFD is studied when water is passed through the designed pressure drop characteristics testing system. The electrical conductivity of porous flow distributor with different wettability and structure is analyzed by classical voltammetry. The bonding strength of super-hydrophobic layer is characterized by ultrasonic shock. Considering the complex working environment in the cell, acid corrosion resistance, organic corrosion resistance and high-temperature damage resistance are systematically characterized.3. Performance validation of the PAB-DMFC with a SHOPFDCompared with traditional PAB-DMFC, this paper reveals how SHOPFD contributes to methanol barrier and two-phase flow management, and investigates the effects of structural parameters（ porosity and thickness）, current collector structure and operation factors（methanol concentration and operation orientation） on cell performance. Besides, the effects of assembly modes and porosity of CWPFD fabricated by combined with SHIPFD on cell performance are also reported.